lib/runtime/dart_sdk.js

Index: lib/runtime/dart_sdk.js
diff --git a/lib/runtime/dart_sdk.js b/lib/runtime/dart_sdk.js
index 89aa138130ea3f845aca09352acc821947d33dfd..fec535d3f6566cf438c1c86c117a2e2fb81c64e1 100644
--- a/lib/runtime/dart_sdk.js
+++ b/lib/runtime/dart_sdk.js
@@ -33,6 +33,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   let ListOfObject = () => (ListOfObject = dart.constFn(core.List$(core.Object)))();
   let JSArrayOfListOfObject = () => (JSArrayOfListOfObject = dart.constFn(_interceptors.JSArray$(ListOfObject())))();
   let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
+  let MapOfSymbol$dynamic = () => (MapOfSymbol$dynamic = dart.constFn(core.Map$(core.Symbol, dart.dynamic)))();
   let MapOfString$int = () => (MapOfString$int = dart.constFn(core.Map$(core.String, core.int)))();
   let ListOfString = () => (ListOfString = dart.constFn(core.List$(core.String)))();
   let JSArrayOfFormatter = () => (JSArrayOfFormatter = dart.constFn(_interceptors.JSArray$(_debugger.Formatter)))();
@@ -473,6 +474,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   let CompleterOfAudioBuffer = () => (CompleterOfAudioBuffer = dart.constFn(async.Completer$(web_audio.AudioBuffer)))();
   let EventStreamProviderOfAudioProcessingEvent = () => (EventStreamProviderOfAudioProcessingEvent = dart.constFn(html$.EventStreamProvider$(web_audio.AudioProcessingEvent)))();
   let StringAndStringToint = () => (StringAndStringToint = dart.constFn(dart.definiteFunctionType(core.int, [core.String, core.String])))();
+  let dynamicTodynamic$ = () => (dynamicTodynamic$ = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
   let dynamicToString = () => (dynamicToString = dart.constFn(dart.definiteFunctionType(core.String, [dart.dynamic])))();
   let dynamicToListOfString = () => (dynamicToListOfString = dart.constFn(dart.definiteFunctionType(ListOfString(), [dart.dynamic])))();
   let dynamicToList = () => (dynamicToList = dart.constFn(dart.definiteFunctionType(core.List, [dart.dynamic])))();
@@ -492,7 +494,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   let StringTobool = () => (StringTobool = dart.constFn(dart.definiteFunctionType(core.bool, [core.String])))();
   let FunctionTovoid = () => (FunctionTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [core.Function])))();
   let StringAndStringToString = () => (StringAndStringToString = dart.constFn(dart.definiteFunctionType(core.String, [core.String, core.String])))();
-  let dynamicTodynamic$ = () => (dynamicTodynamic$ = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
   let TypeAndStringTodynamic = () => (TypeAndStringTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [core.Type, core.String])))();
   let dynamicAnddynamicTodynamic$ = () => (dynamicAnddynamicTodynamic$ = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic])))();
   let ListOfEToListOfE = () => (ListOfEToListOfE = dart.constFn(dart.definiteFunctionType(E => [core.List$(E), [core.List$(E)]])))();
@@ -911,14 +912,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return sig;
     });
   };
-  dart.canonicalMember = function(obj, name) {
-    if (typeof name === 'symbol') return name;
-    if (obj != null && obj[dart._extensionType]) return dart.dartx[name];
-    if (name == 'constructor' || name == 'prototype') {
-      name = '+' + name;
-    }
-    return name;
-  };
   dart.setType = function(obj, type) {
     obj.__proto__ = type.prototype;
     return obj;
@@ -934,213 +927,214 @@ dart_library.library('dart_sdk', null, /* Imports */[
     derived.prototype[dart._extensionType] = derived;
     derived.prototype.__proto__ = base.prototype;
   };
-  dart.throwCastError = function(object, actual, type) {
-    dart.throw(new _js_helper.CastErrorImplementation(object, dart.typeName(actual), dart.typeName(type)));
-  };
-  dart.throwTypeError = function(object, actual, type) {
-    dart.throw(new _js_helper.TypeErrorImplementation(object, dart.typeName(actual), dart.typeName(type)));
-  };
-  dart.throwStrongModeCastError = function(object, actual, type) {
-    dart.throw(new _js_helper.StrongModeCastError(object, dart.typeName(actual), dart.typeName(type)));
-  };
-  dart.throwStrongModeTypeError = function(object, actual, type) {
-    dart.throw(new _js_helper.StrongModeTypeError(object, dart.typeName(actual), dart.typeName(type)));
+  dart.fn = function(closure, t) {
+    if (t == null) {
+      t = dart.definiteFunctionType(dart.dynamic, Array(closure.length).fill(dart.dynamic), void 0);
+    }
+    dart.tag(closure, t);
+    return closure;
   };
-  dart.throwUnimplementedError = function(message) {
-    dart.throw(new core.UnimplementedError(message));
+  dart.lazyFn = function(closure, computeType) {
+    dart.tagLazy(closure, computeType);
+    return closure;
   };
-  dart.throwAssertionError = function() {
-    dart.throw(new core.AssertionError());
+  dart._checkPrimitiveType = function(obj) {
+    if (obj == null) return core.Null;
+    if (typeof obj == "number") {
+      if (Math.floor(obj) == obj) {
+        return core.int;
+      }
+      return core.double;
+    }
+    if (typeof obj == "boolean") {
+      return core.bool;
+    }
+    if (typeof obj == "string") {
+      return core.String;
+    }
+    if (typeof obj == "symbol") {
+      return dart.jsobject;
+    }
+    return null;
   };
-  dart.throwNullValueError = function() {
-    dart.throw(new core.NoSuchMethodError(null, new core.Symbol('<Unexpected Null Value>'), null, null, null));
+  dart.getFunctionType = function(obj) {
+    let args = Array(obj.length).fill(dart.dynamic);
+    return dart.definiteFunctionType(dart.bottom, args, void 0);
   };
-  dart.syncStar = function(gen, E, ...args) {
-    const SyncIterable_E = dart.getGenericClass(_js_helper.SyncIterable)(E);
-    return new SyncIterable_E(gen, args);
+  dart.getReifiedType = function(obj) {
+    let result = dart._checkPrimitiveType(obj);
+    if (result != null) return result;
+    return dart._nonPrimitiveRuntimeType(obj);
   };
-  dart.async = function(gen, T, ...args) {
-    let iter;
-    function onValue(res) {
-      if (res === void 0) res = null;
-      return next(iter.next(res));
+  dart._nonPrimitiveRuntimeType = function(obj) {
+    let result = dart._getRuntimeType(obj);
+    if (result != null) return result;
+    result = dart.getExtensionType(obj);
+    if (result != null) return result;
+    result = obj.constructor;
+    if (result === Function) {
+      return dart.jsobject;
     }
-    function onError(err) {
-      return next(iter.throw(err));
+    if (result == null) {
+      return dart.jsobject;
     }
-    function next(ret) {
-      if (ret.done) return ret.value;
-      let future = ret.value;
-      if (!dart.is(future, dart.getGenericClass(async.Future))) {
-        future = async.Future.value(future);
-      }
-      return future.then(dart.dynamic)(onValue, {onError: onError});
+    return result;
+  };
+  dart.wrapType = function(type) {
+    if (type.hasOwnProperty(dart._typeObject)) {
+      return type[dart._typeObject];
     }
-    return dart.getGenericClass(async.Future)(T).new(function() {
-      iter = gen.apply(null, args)[Symbol.iterator]();
-      return onValue();
-    });
+    return type[dart._typeObject] = new dart.WrappedType(type);
   };
-  dart.asyncStar = function(gen, T, ...args) {
-    return new dart._AsyncStarStreamController(gen, T, args).controller.stream;
+  const _wrappedType = Symbol('_wrappedType');
+  dart.unwrapType = function(obj) {
+    return dart.dload(obj, _wrappedType);
   };
-  dart._canonicalFieldName = function(obj, name, args, displayName) {
-    name = dart.canonicalMember(obj, name);
-    if (name) return name;
-    dart.throwNoSuchMethodFunc(obj, displayName, args);
+  dart._getRuntimeType = function(value) {
+    return value[dart._runtimeType];
   };
-  dart.dload = function(obj, field) {
-    field = dart._canonicalFieldName(obj, field, [], field);
-    dart._trackCall(obj, field);
-    if (dart.hasMethod(obj, field)) {
-      return dart.bind(obj, field);
-    }
-    let result = obj[field];
-    return result;
+  dart.tag = function(value, t) {
+    value[dart._runtimeType] = t;
   };
-  dart.dput = function(obj, field, value) {
-    field = dart._canonicalFieldName(obj, field, [value], field);
-    dart._trackCall(obj, field);
-    obj[field] = value;
-    return value;
+  dart.tagComputed = function(value, compute) {
+    dart.defineProperty(value, dart._runtimeType, {get: compute});
   };
-  dart._checkApply = function(type, actuals) {
-    if (actuals.length < type.args.length) return false;
-    let index = 0;
-    for (let i = 0; i < type.args.length; ++i) {
-      if (!dart.instanceOfOrNull(actuals[i], type.args[i])) return false;
-      ++index;
-    }
-    if (actuals.length == type.args.length) return true;
-    let extras = actuals.length - type.args.length;
-    if (type.optionals.length > 0) {
-      if (extras > type.optionals.length) return false;
-      for (let i = 0, j = index; i < extras; ++i, ++j) {
-        if (!dart.instanceOfOrNull(actuals[j], type.optionals[i])) return false;
-      }
+  dart.tagLazy = function(value, compute) {
+    dart.defineLazyProperty(value, dart._runtimeType, {get: compute});
+  };
+  dart._initialize2 = function() {
+    dart.TypeRep.prototype.is = function is_T(object) {
+      return dart.is(object, this);
+    };
+    dart.TypeRep.prototype.as = function as_T(object) {
+      return dart.as(object, this);
+    };
+    dart.TypeRep.prototype._check = function check_T(object) {
+      return dart.check(object, this);
+    };
+    dart.Dynamic.prototype.is = function is_Dynamic(object) {
       return true;
-    }
-    if (extras != 1) return false;
-    if (dart.getOwnPropertyNames(type.named).length == 0) return false;
-    let opts = actuals[index];
-    let names = dart.getOwnPropertyNames(opts);
-    if (names.length == 0) return false;
-    for (var name of names) {
-      if (!dart.hasOwnProperty.call(type.named, name)) {
-        return false;
+    };
+    dart.Dynamic.prototype.as = function as_Dynamic(object) {
+      return object;
+    };
+    dart.Dynamic.prototype._check = function check_Dynamic(object) {
+      return object;
+    };
+  };
+  dart._functionType = function(definite, returnType, args, extra) {
+    if (args === void 0 && extra === void 0) {
+      const fnTypeParts = returnType;
+      function makeGenericFnType(...types) {
+        let parts = fnTypeParts.apply(null, types);
+        return dart.FunctionType.create(definite, parts[0], parts[1], parts[2]);
       }
-      if (!dart.instanceOfOrNull(opts[name], type.named[name])) return false;
+      makeGenericFnType[dart._typeFormalCount] = fnTypeParts.length;
+      return makeGenericFnType;
     }
-    return true;
+    return dart.FunctionType.create(definite, returnType, args, extra);
   };
-  dart._dartSymbol = function(name) {
-    return dart.const(core.Symbol.new(name.toString()));
+  dart.functionType = function(returnType, args, extra) {
+    return dart._functionType(false, returnType, args, extra);
   };
-  dart.throwNoSuchMethod = function(obj, name, pArgs, nArgs, extras) {
-    dart.throw(new core.NoSuchMethodError(obj, dart._dartSymbol(name), pArgs, nArgs, extras));
+  dart.definiteFunctionType = function(returnType, args, extra) {
+    return dart._functionType(true, returnType, args, extra);
   };
-  dart.throwNoSuchMethodFunc = function(obj, name, pArgs, opt_func) {
-    if (obj === void 0) obj = opt_func;
-    dart.throwNoSuchMethod(obj, name, pArgs);
+  dart.typedef = function(name, closure) {
+    return new dart.Typedef(name, closure);
   };
-  dart._checkAndCall = function(f, ftype, obj, typeArgs, args, name) {
-    dart._trackCall(obj, name);
-    let originalFunction = f;
-    if (!(f instanceof Function)) {
-      if (f != null) {
-        ftype = dart.getMethodType(f, 'call');
-        f = f.call;
+  dart.typeName = function(type) {
+    if (type === void 0) return "undefined type";
+    if (type === null) return "null type";
+    if (type instanceof dart.TypeRep) {
+      if (type instanceof dart.Typedef) {
+        return type.name + "(" + type.functionType.toString() + ")";
       }
-      if (!(f instanceof Function)) {
-        dart.throwNoSuchMethodFunc(obj, name, args, originalFunction);
+      return type.toString();
+    }
+    let tag = dart._getRuntimeType(type);
+    if (tag === core.Type) {
+      let name = type.name;
+      let args = dart.getGenericArgs(type);
+      if (!args) return name;
+      let result = name;
+      let allDynamic = true;
+      result += '<';
+      for (let i = 0; i < args.length; ++i) {
+        if (i > 0) result += ', ';
+        let argName = dart.typeName(args[i]);
+        if (argName != 'dynamic') allDynamic = false;
+        result += argName;
       }
+      result += '>';
+      if (allDynamic) return name;
+      return result;
     }
-    if (ftype === void 0) {
-      ftype = dart._getRuntimeType(f);
+    if (tag) return "Not a type: " + tag.name;
+    return "JSObject<" + type.name + ">";
+  };
+  dart.getImplicitFunctionType = function(type) {
+    if (dart.test(dart.isFunctionType(type))) return type;
+    return dart.getMethodTypeFromType(type, 'call');
+  };
+  dart.isFunctionType = function(type) {
+    return type instanceof dart.AbstractFunctionType || type === core.Function;
+  };
+  dart.isFunctionSubtype = function(ft1, ft2, covariant) {
+    if (ft2 === core.Function) {
+      return true;
     }
-    if (!ftype) {
-      if (typeArgs != null) {
-        dart.throwStrongModeError('call to JS object `' + obj + '` with type arguments <' + typeArgs + '> is not supported.');
-      }
-      return f.apply(obj, args);
+    if (ft1 === core.Function) {
+      return false;
     }
-    let formalCount = ftype[dart._typeFormalCount];
-    if (formalCount != null) {
-      if (typeArgs == null) {
-        typeArgs = Array(formalCount).fill(dart.dynamic);
-      } else if (typeArgs.length != formalCount) {
-        dart.throwStrongModeError('incorrect number of arguments to generic function ' + dart.typeName(ftype) + ', got <' + typeArgs + '> expected ' + formalCount + '.');
+    let ret1 = ft1.returnType;
+    let ret2 = ft2.returnType;
+    let args1 = ft1.args;
+    let args2 = ft2.args;
+    if (args1.length > args2.length) {
+      return covariant ? false : null;
+    }
+    for (let i = 0; i < args1.length; ++i) {
+      if (!dart._isSubtype(args2[i], args1[i], !covariant)) {
+        return null;
       }
-      ftype = ftype.apply(null, typeArgs);
-    } else if (typeArgs != null) {
-      dart.throwStrongModeError('got type arguments to non-generic function ' + dart.typeName(ftype) + ', got <' + typeArgs + '> expected none.');
     }
-    if (dart._checkApply(ftype, args)) {
-      if (typeArgs != null) {
-        return f.apply(obj, typeArgs).apply(obj, args);
+    let optionals1 = ft1.optionals;
+    let optionals2 = ft2.optionals;
+    if (args1.length + optionals1.length < args2.length + optionals2.length) {
+      return covariant ? false : null;
+    }
+    let j = 0;
+    for (let i = args1.length; i < args2.length; ++i, ++j) {
+      if (!dart._isSubtype(args2[i], optionals1[j], !covariant)) {
+        return null;
       }
-      return f.apply(obj, args);
     }
-    dart.throwNoSuchMethodFunc(obj, name, args, originalFunction);
-  };
-  dart.dcall = function(f, ...args) {
-    return dart._checkAndCall(f, dart._getRuntimeType(f), void 0, null, args, 'call');
-  };
-  dart.dgcall = function(f, typeArgs, ...args) {
-    return dart._checkAndCall(f, dart._getRuntimeType(f), void 0, typeArgs, args, 'call');
-  };
-  dart.getDynamicStats = function() {
-    let ret = JSArrayOfListOfObject().of([]);
-    let keys = dart._callMethodStats[dartx.keys][dartx.toList]();
-    keys[dartx.sort](dart.fn((a, b) => dart._callMethodStats[dartx.get](b)[dartx.compareTo](dart._callMethodStats[dartx.get](a)), StringAndStringToint()));
-    for (let key of keys) {
-      let count = dart._callMethodStats[dartx.get](key);
-      ret[dartx.add](JSArrayOfObject().of([key, count]));
-    }
-    return ret;
-  };
-  dart.clearDynamicStats = function() {
-    dart._callMethodStats[dartx.clear]();
-  };
-  dart._trackCall = function(obj, name) {
-    if (!dart.trackProfile) return;
-    let actual = dart.getReifiedType(obj);
-    let stackStr = new Error().stack;
-    let stack = stackStr[dartx.split]('\n    at ');
-    let src = '';
-    for (let i = 2; i < dart.notNull(stack[dartx.length]); ++i) {
-      let frame = stack[dartx.get](i);
-      if (!dart.test(frame[dartx.contains]('dev_compiler/lib/runtime/dart_sdk.js'))) {
-        src = frame;
-        break;
+    for (let i = 0; i < optionals2.length; ++i, ++j) {
+      if (!dart._isSubtype(optionals2[i], optionals1[j], !covariant)) {
+        return null;
       }
     }
-    name = dart.str`${dart.typeName(actual)}.${name} <${src}>`;
-    if (dart.test(dart._callMethodStats[dartx.containsKey](name))) {
-      dart._callMethodStats[dartx.set](core.String._check(name), dart.notNull(dart._callMethodStats[dartx.get](name)) + 1);
-    } else {
-      dart._callMethodStats[dartx.set](core.String._check(name), 1);
+    let named1 = ft1.named;
+    let named2 = ft2.named;
+    let names = dart.getOwnPropertyNames(named2);
+    for (let i = 0; i < names.length; ++i) {
+      let name = names[i];
+      let n1 = named1[name];
+      let n2 = named2[name];
+      if (n1 === void 0) {
+        return covariant ? false : null;
+      }
+      if (!dart._isSubtype(n2, n1, !covariant)) {
+        return null;
+      }
     }
+    if (ret2 === dart.void) return true;
+    if (ret1 === dart.void) return ret2 === dart.dynamic;
+    if (!dart._isSubtype(ret1, ret2, covariant)) return null;
+    return true;
   };
-  dart._callMethod = function(obj, name, typeArgs, args, displayName) {
-    let symbol = dart._canonicalFieldName(obj, name, args, displayName);
-    let f = obj != null ? obj[symbol] : null;
-    let ftype = dart.getMethodType(obj, symbol);
-    return dart._checkAndCall(f, ftype, obj, typeArgs, args, displayName);
-  };
-  dart.dsend = function(obj, method, ...args) {
-    return dart._callMethod(obj, method, null, args, method);
-  };
-  dart.dgsend = function(obj, typeArgs, method, ...args) {
-    return dart._callMethod(obj, method, typeArgs, args, method);
-  };
-  dart.dindex = function(obj, index) {
-    return dart._callMethod(obj, 'get', null, [index], '[]');
-  };
-  dart.dsetindex = function(obj, index, value) {
-    return dart._callMethod(obj, 'set', null, [index, value], '[]=');
-  };
-  dart._ignoreMemo = function(f) {
+  dart._subtypeMemo = function(f) {
     let memo = new Map();
     return (t1, t2) => {
       let map = memo.get(t1);
@@ -1156,581 +1150,597 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return result;
     };
   };
-  dart.strongInstanceOf = function(obj, type, ignoreFromWhiteList) {
-    let actual = dart.getReifiedType(obj);
-    let result = dart.isSubtype(actual, type);
-    if (result || actual == dart.jsobject || actual == core.int && type == core.double) return true;
-    if (result === false) return false;
-    if (ignoreFromWhiteList == void 0) return result;
-    if (dart._ignoreTypeFailure(actual, type)) return true;
-    return result;
+  dart._isBottom = function(type) {
+    return type == dart.bottom;
   };
-  dart.instanceOfOrNull = function(obj, type) {
-    if (obj == null || dart.strongInstanceOf(obj, type, true)) return true;
-    return false;
+  dart._isTop = function(type) {
+    return type == core.Object || type == dart.dynamic;
   };
-  dart.is = function(obj, type) {
-    let result = dart.strongInstanceOf(obj, type);
-    if (result !== null) return result;
-    let actual = dart.getReifiedType(obj);
-    dart.throwStrongModeError('Strong mode is-check failure: ' + dart.typeName(actual) + ' does not soundly subtype ' + dart.typeName(type));
+  dart._isSubtype = function(t1, t2, covariant) {
+    if (t1 === t2) return true;
+    if (dart._isTop(t2) || dart._isBottom(t1)) {
+      return true;
+    }
+    if (dart._isBottom(t2)) return null;
+    if (dart._isTop(t1)) {
+      if (t1 === dart.dynamic) return null;
+      return false;
+    }
+    if (!(t1 instanceof dart.AbstractFunctionType) && !(t2 instanceof dart.AbstractFunctionType)) {
+      let result = dart.isClassSubType(t1, t2, covariant);
+      if (result === true || result === null) return result;
+    }
+    t1 = dart.getImplicitFunctionType(t1);
+    if (!t1) return false;
+    if (dart.isFunctionType(t1) && dart.isFunctionType(t2)) {
+      return dart.isFunctionSubtype(t1, t2, covariant);
+    }
+    return false;
   };
-  dart.as = function(obj, type) {
-    if (type == dart.dynamic || obj == null) return obj;
-    let result = dart.strongInstanceOf(obj, type, true);
-    if (result) return obj;
-    dart._throwCastError(obj, type, result);
+  dart.isClassSubType = function(t1, t2, covariant) {
+    if (t1 == t2) return true;
+    if (t1 == core.Object) return false;
+    if (t1 == null) return t2 == core.Object || t2 == dart.dynamic;
+    let raw1 = dart.getGenericClass(t1);
+    let raw2 = dart.getGenericClass(t2);
+    if (raw1 != null && raw1 == raw2) {
+      let typeArguments1 = dart.getGenericArgs(t1);
+      let typeArguments2 = dart.getGenericArgs(t2);
+      let length = typeArguments1.length;
+      if (typeArguments2.length == 0) {
+        return true;
+      } else if (length == 0) {
+        if (typeArguments2.every(dart._isTop)) return true;
+        return null;
+      }
+      dart.assert(length == typeArguments2.length);
+      for (let i = 0; i < length; ++i) {
+        let result = dart._isSubtype(typeArguments1[i], typeArguments2[i], covariant);
+        if (!result) {
+          return result;
+        }
+      }
+      return true;
+    }
+    let indefinite = false;
+    function definitive(t1, t2) {
+      let result = dart.isClassSubType(t1, t2, covariant);
+      if (result == null) {
+        indefinite = true;
+        return false;
+      }
+      return result;
+    }
+    if (definitive(t1.__proto__, t2)) return true;
+    let mixins = dart.getMixins(t1);
+    if (mixins) {
+      for (let m1 of mixins) {
+        if (m1 != null && definitive(m1, t2)) return true;
+      }
+    }
+    let getInterfaces = dart.getImplements(t1);
+    if (getInterfaces) {
+      for (let i1 of getInterfaces()) {
+        if (i1 != null && definitive(i1, t2)) return true;
+      }
+    }
+    if (indefinite) return null;
+    return false;
   };
-  dart.check = function(obj, type) {
-    if (type == dart.dynamic || obj == null) return obj;
-    let result = dart.strongInstanceOf(obj, type, true);
-    if (result) return obj;
-    dart._throwTypeError(obj, type, result);
+  dart.isGroundType = function(type) {
+    if (type instanceof dart.AbstractFunctionType) {
+      if (!dart._isTop(type.returnType)) return false;
+      for (let i = 0; i < type.args.length; ++i) {
+        if (!dart._isBottom(type.args[i])) return false;
+      }
+      for (let i = 0; i < type.optionals.length; ++i) {
+        if (!dart._isBottom(type.optionals[i])) return false;
+      }
+      let names = dart.getOwnPropertyNames(type.named);
+      for (let i = 0; i < names.length; ++i) {
+        if (!dart._isBottom(type.named[names[i]])) return false;
+      }
+      return true;
+    }
+    let typeArgs = dart.getGenericArgs(type);
+    if (!typeArgs) return true;
+    for (let t of typeArgs) {
+      if (t != core.Object && t != dart.dynamic) return false;
+    }
+    return true;
   };
-  dart.test = function(obj) {
-    if (typeof obj == 'boolean') return obj;
-    return dart.booleanConversionFailed(obj);
+  dart.throwCastError = function(object, actual, type) {
+    dart.throw(new _js_helper.CastErrorImplementation(object, dart.typeName(actual), dart.typeName(type)));
   };
-  dart.booleanConversionFailed = function(obj) {
-    if (obj == null) {
-      dart.throw(new _js_helper.BooleanConversionAssertionError());
-    }
-    let actual = dart.getReifiedType(obj);
-    let expected = core.bool;
-    dart.throw(new _js_helper.TypeErrorImplementation.fromMessage(dart.str`type '${dart.typeName(actual)}' is not a subtype of ` + dart.str`type '${dart.typeName(expected)}' in boolean expression`));
+  dart.throwTypeError = function(object, actual, type) {
+    dart.throw(new _js_helper.TypeErrorImplementation(object, dart.typeName(actual), dart.typeName(type)));
   };
-  dart._throwCastError = function(obj, type, result) {
-    let actual = dart.getReifiedType(obj);
-    if (result == false) dart.throwCastError(obj, actual, type);
-    dart.throwStrongModeCastError(obj, actual, type);
+  dart.throwStrongModeCastError = function(object, actual, type) {
+    dart.throw(new _js_helper.StrongModeCastError(object, dart.typeName(actual), dart.typeName(type)));
   };
-  dart._throwTypeError = function(obj, type, result) {
-    let actual = dart.getReifiedType(obj);
-    if (result == false) dart.throwTypeError(obj, actual, type);
-    dart.throwStrongModeTypeError(obj, actual, type);
+  dart.throwStrongModeTypeError = function(object, actual, type) {
+    dart.throw(new _js_helper.StrongModeTypeError(object, dart.typeName(actual), dart.typeName(type)));
   };
-  dart.asInt = function(obj) {
-    if (obj == null) return null;
-    if (Math.floor(obj) != obj) {
-      dart.throwCastError(obj, dart.getReifiedType(obj), core.int);
-    }
-    return obj;
+  dart.throwUnimplementedError = function(message) {
+    dart.throw(new core.UnimplementedError(message));
   };
-  dart.addSimpleTypeTests = function(ctor) {
-    ctor.is = function is_C(object) {
-      if (object instanceof this) return true;
-      return dart.is(object, this);
-    };
-    ctor.as = function as_C(object) {
-      if (object instanceof this) return object;
-      return dart.as(object, this);
-    };
-    ctor._check = function check_C(object) {
-      if (object instanceof this) return object;
-      return dart.check(object, this);
-    };
+  dart.throwAssertionError = function() {
+    dart.throw(new core.AssertionError());
   };
-  dart.addTypeTests = function(ctor) {
-    ctor.as = function as_G(object) {
-      return dart.as(object, this);
-    };
-    ctor.is = function is_G(object) {
-      return dart.is(object, this);
-    };
-    ctor._check = function check_G(object) {
-      return dart.check(object, this);
-    };
+  dart.throwNullValueError = function() {
+    dart.throw(new core.NoSuchMethodError(null, new core.Symbol('<Unexpected Null Value>'), null, null, null));
   };
-  dart.equals = function(x, y) {
-    if (x == null || y == null) return x == y;
-    let eq = x['=='];
-    return eq ? eq.call(x, y) : x === y;
-  };
-  dart.notNull = function(x) {
-    if (x == null) dart.throwNullValueError();
-    return x;
+  dart.syncStar = function(gen, E, ...args) {
+    const SyncIterable_E = dart.getGenericClass(_js_helper.SyncIterable)(E);
+    return new SyncIterable_E(gen, args);
   };
-  dart.map = function(values, K, V) {
-    if (K === void 0) K = null;
-    if (V === void 0) V = null;
-    return (() => {
-      if (K == null) K = dart.dynamic;
-      if (V == null) V = dart.dynamic;
-      let map = dart.getGenericClass(collection.LinkedHashMap)(K, V).new();
-      if (Array.isArray(values)) {
-        for (let i = 0, end = values.length - 1; i < end; i += 2) {
-          let key = values[i];
-          let value = values[i + 1];
-          map.set(key, value);
-        }
-      } else if (typeof values === 'object') {
-        for (let key of dart.getOwnPropertyNames(values)) {
-          map.set(key, values[key]);
-        }
+  dart.async = function(gen, T, ...args) {
+    let iter;
+    function onValue(res) {
+      if (res === void 0) res = null;
+      return next(iter.next(res));
+    }
+    function onError(err) {
+      return next(iter.throw(err));
+    }
+    function next(ret) {
+      if (ret.done) return ret.value;
+      let future = ret.value;
+      if (!dart.is(future, dart.getGenericClass(async.Future))) {
+        future = async.Future.value(future);
       }
-      return map;
-    })();
-  };
-  dart.assert = function(condition) {
-    if (!condition) dart.throwAssertionError();
-  };
-  dart.throw = function(obj) {
-    if (obj != null && (typeof obj == 'object' || typeof obj == 'function')) {
-      dart._stack.set(obj, new Error());
+      return future.then(dart.dynamic)(onValue, {onError: onError});
     }
-    throw obj;
-  };
-  dart.getError = function(exception) {
-    var stack = dart._stack.get(exception);
-    return stack !== void 0 ? stack : exception;
-  };
-  dart.stackPrint = function(exception) {
-    var error = dart.getError(exception);
-    console.log(error.stack ? error.stack : 'No stack trace for: ' + error);
+    return dart.getGenericClass(async.Future)(T).new(function() {
+      iter = gen.apply(null, args)[Symbol.iterator]();
+      return onValue();
+    });
   };
-  dart.stackTrace = function(exception) {
-    var error = dart.getError(exception);
-    return _js_helper.getTraceFromException(error);
+  dart.asyncStar = function(gen, T, ...args) {
+    return new dart._AsyncStarStreamController(gen, T, args).controller.stream;
   };
-  dart.nullSafe = function(obj, ...callbacks) {
-    if (obj == null) return obj;
-    for (const callback of callbacks) {
-      obj = callback(obj);
-      if (obj == null) break;
+  dart.dload = function(obj, field) {
+    let f = dart._canonicalMember(obj, field);
+    dart._trackCall(obj, f);
+    if (f != null) {
+      if (dart.test(dart.hasMethod(obj, f))) return dart.bind(obj, f, void 0);
+      return obj[f];
     }
-    return obj;
+    return dart.noSuchMethod(obj, new dart._Invocation(core.String._check(field), [], {isGetter: true}));
   };
-  dart.multiKeyPutIfAbsent = function(map, keys, valueFn) {
-    for (let k of keys) {
-      let value = map.get(k);
-      if (!value) {
-        map.set(k, value = new Map());
-      }
-      map = value;
+  dart.dput = function(obj, field, value) {
+    let f = dart._canonicalMember(obj, field);
+    dart._trackCall(obj, f);
+    if (f != null) {
+      return obj[f] = value;
     }
-    if (map.has(dart._value)) return map.get(dart._value);
-    let value = valueFn();
-    map.set(dart._value, value);
-    return value;
+    return dart.noSuchMethod(obj, new dart._Invocation(core.String._check(field), [value], {isSetter: true}));
   };
-  dart.const = function(obj) {
-    function lookupNonTerminal(map, key) {
-      let result = map.get(key);
-      if (result !== void 0) return result;
-      map.set(key, result = new Map());
-      return result;
-    }
-    let names = dart.getOwnNamesAndSymbols(obj);
-    let count = names.length;
-    let map = lookupNonTerminal(dart.constants, count);
-    for (let i = 0; i < count; i++) {
-      let name = names[i];
-      map = lookupNonTerminal(map, name);
-      map = lookupNonTerminal(map, obj[name]);
+  dart._checkApply = function(type, actuals) {
+    if (actuals.length < type.args.length) return false;
+    let index = 0;
+    for (let i = 0; i < type.args.length; ++i) {
+      if (!dart.instanceOfOrNull(actuals[i], type.args[i])) return false;
+      ++index;
     }
-    let type = dart.getReifiedType(obj);
-    let value = map.get(type);
-    if (value) return value;
-    map.set(type, obj);
-    return obj;
-  };
-  dart.constList = function(elements, elementType) {
-    function lookupNonTerminal(map, key) {
-      let result = map.get(key);
-      if (result !== void 0) return result;
-      map.set(key, result = new Map());
-      return result;
+    if (actuals.length == type.args.length) return true;
+    let extras = actuals.length - type.args.length;
+    if (type.optionals.length > 0) {
+      if (extras > type.optionals.length) return false;
+      for (let i = 0, j = index; i < extras; ++i, ++j) {
+        if (!dart.instanceOfOrNull(actuals[j], type.optionals[i])) return false;
+      }
+      return true;
     }
-    let count = elements.length;
-    let map = lookupNonTerminal(dart.constantLists, count);
-    for (let i = 0; i < count; i++) {
-      map = lookupNonTerminal(map, elements[i]);
+    if (extras != 1) return false;
+    if (dart.getOwnPropertyNames(type.named).length == 0) return false;
+    let opts = actuals[index];
+    let names = dart.getOwnPropertyNames(opts);
+    if (names.length == 0) return false;
+    for (var name of names) {
+      if (!dart.hasOwnProperty.call(type.named, name)) {
+        return false;
+      }
+      if (!dart.instanceOfOrNull(opts[name], type.named[name])) return false;
     }
-    let value = map.get(elementType);
-    if (value) return value;
-    value = dart.list(elements, elementType);
-    map.set(elementType, value);
-    return value;
+    return true;
   };
-  dart.hashCode = function(obj) {
-    if (obj == null) return 0;
-    switch (typeof obj) {
-      case "number":
-      {
-        return obj & 0x1FFFFFFF;
+  dart._dartSymbol = function(name) {
+    return dart.const(core.Symbol.new(name.toString()));
+  };
+  dart._checkAndCall = function(f, ftype, obj, typeArgs, args, name) {
+    dart._trackCall(obj, name);
+    let originalTarget = obj === void 0 ? f : obj;
+    function callNSM() {
+      let namedArgs = null;
+      if (args.length > 1 && args[args.length - 1].__proto__ == Object.prototype) {
+        namedArgs = args.pop();
       }
-      case "boolean":
-      {
-        return obj ? 2 * 3 * 23 * 3761 : 269 * 811;
+      return dart.noSuchMethod(originalTarget, new dart._Invocation(name, args, {namedArguments: namedArgs, isMethod: true}));
+    }
+    if (!(f instanceof Function)) {
+      if (f != null) {
+        ftype = dart.getMethodType(f, 'call');
+        f = f.call;
+      }
+      if (!(f instanceof Function)) {
+        return callNSM();
       }
     }
-    let extension = dart.getExtensionType(obj);
-    if (extension != null) {
-      return obj[dartx.hashCode];
+    if (ftype === void 0) {
+      ftype = dart._getRuntimeType(f);
     }
-    return obj.hashCode;
-  };
-  dart.toString = function(obj) {
-    if (obj == null) return "null";
-    let extension = dart.getExtensionType(obj);
-    if (extension != null) {
-      return obj[dartx.toString]();
+    if (!ftype) {
+      if (typeArgs != null) {
+        dart.throwStrongModeError('call to JS object `' + obj + '` with type arguments <' + typeArgs + '> is not supported.');
+      }
+      return f.apply(obj, args);
     }
-    return obj.toString();
-  };
-  dart.noSuchMethod = function(obj, invocation) {
-    if (obj == null) {
-      dart.throw(new core.NoSuchMethodError(null, invocation.memberName, invocation.positionalArguments, invocation.namedArguments));
+    let formalCount = ftype[dart._typeFormalCount];
+    if (formalCount != null) {
+      if (typeArgs == null) {
+        typeArgs = Array(formalCount).fill(dart.dynamic);
+      } else if (typeArgs.length != formalCount) {
+        dart.throwStrongModeError('incorrect number of arguments to generic function ' + dart.typeName(ftype) + ', got <' + typeArgs + '> expected ' + formalCount + '.');
+      }
+      ftype = ftype.apply(null, typeArgs);
+    } else if (typeArgs != null) {
+      dart.throwStrongModeError('got type arguments to non-generic function ' + dart.typeName(ftype) + ', got <' + typeArgs + '> expected none.');
     }
-    let extension = dart.getExtensionType(obj);
-    if (extension != null) {
-      return obj[dartx.noSuchMethod](invocation);
+    if (dart._checkApply(ftype, args)) {
+      if (typeArgs != null) {
+        return f.apply(obj, typeArgs).apply(obj, args);
+      }
+      return f.apply(obj, args);
     }
-    return obj.noSuchMethod(invocation);
-  };
-  dart.constFn = function(x) {
-    return () => x;
+    return callNSM();
   };
-  dart.runtimeType = function(obj) {
-    let result = dart._checkPrimitiveType(obj);
-    if (result != null) return dart.wrapType(result);
-    let extension = dart.getExtensionType(obj);
-    if (extension != null) {
-      return obj[dartx.runtimeType];
-    }
-    return obj.runtimeType;
+  dart.dcall = function(f, ...args) {
+    return dart._checkAndCall(f, dart._getRuntimeType(f), void 0, null, args, 'call');
   };
-  dart.str = function(strings, ...values) {
-    let s = strings[0];
-    for (let i = 0, len = values.length; i < len;) {
-      s += dart.notNull(dart.toString(values[i])) + strings[++i];
-    }
-    return s;
+  dart.dgcall = function(f, typeArgs, ...args) {
+    return dart._checkAndCall(f, dart._getRuntimeType(f), void 0, typeArgs, args, 'call');
   };
-  dart.fn = function(closure, t) {
-    if (t == null) {
-      t = dart.definiteFunctionType(dart.dynamic, Array(closure.length).fill(dart.dynamic), void 0);
+  dart.getDynamicStats = function() {
+    let ret = JSArrayOfListOfObject().of([]);
+    let keys = dart._callMethodStats[dartx.keys][dartx.toList]();
+    keys[dartx.sort](dart.fn((a, b) => dart._callMethodStats[dartx.get](b)[dartx.compareTo](dart._callMethodStats[dartx.get](a)), StringAndStringToint()));
+    for (let key of keys) {
+      let count = dart._callMethodStats[dartx.get](key);
+      ret[dartx.add](JSArrayOfObject().of([key, count]));
     }
-    dart.tag(closure, t);
-    return closure;
+    return ret;
   };
-  dart.lazyFn = function(closure, computeType) {
-    dart.tagLazy(closure, computeType);
-    return closure;
+  dart.clearDynamicStats = function() {
+    dart._callMethodStats[dartx.clear]();
   };
-  dart._checkPrimitiveType = function(obj) {
-    if (obj == null) return core.Null;
-    if (typeof obj == "number") {
-      if (Math.floor(obj) == obj) {
-        return core.int;
+  dart._trackCall = function(obj, name) {
+    if (!dart.trackProfile) return;
+    let actual = dart.getReifiedType(obj);
+    let stackStr = new Error().stack;
+    let stack = stackStr[dartx.split]('\n    at ');
+    let src = '';
+    for (let i = 2; i < dart.notNull(stack[dartx.length]); ++i) {
+      let frame = stack[dartx.get](i);
+      if (!dart.test(frame[dartx.contains]('dev_compiler/lib/runtime/dart_sdk.js'))) {
+        src = frame;
+        break;
       }
-      return core.double;
     }
-    if (typeof obj == "boolean") {
-      return core.bool;
-    }
-    if (typeof obj == "string") {
-      return core.String;
+    name = dart.str`${dart.typeName(actual)}.${name} <${src}>`;
+    if (dart.test(dart._callMethodStats[dartx.containsKey](name))) {
+      dart._callMethodStats[dartx.set](core.String._check(name), dart.notNull(dart._callMethodStats[dartx.get](name)) + 1);
+    } else {
+      dart._callMethodStats[dartx.set](core.String._check(name), 1);
     }
-    if (typeof obj == "symbol") {
-      return dart.jsobject;
+  };
+  dart._callMethod = function(obj, name, typeArgs, args, displayName) {
+    let symbol = dart._canonicalMember(obj, name);
+    if (symbol == null) {
+      return dart.noSuchMethod(obj, new dart._Invocation(core.String._check(displayName), core.List._check(args), {isMethod: true}));
     }
-    return null;
+    let f = obj != null ? obj[symbol] : null;
+    let ftype = dart.getMethodType(obj, symbol);
+    return dart._checkAndCall(f, ftype, obj, typeArgs, args, displayName);
   };
-  dart.getFunctionType = function(obj) {
-    let args = Array(obj.length).fill(dart.dynamic);
-    return dart.definiteFunctionType(dart.bottom, args, void 0);
+  dart.dsend = function(obj, method, ...args) {
+    return dart._callMethod(obj, method, null, args, method);
   };
-  dart.getReifiedType = function(obj) {
-    let result = dart._checkPrimitiveType(obj);
-    if (result != null) return result;
-    return dart._nonPrimitiveRuntimeType(obj);
+  dart.dgsend = function(obj, typeArgs, method, ...args) {
+    return dart._callMethod(obj, method, typeArgs, args, method);
   };
-  dart._nonPrimitiveRuntimeType = function(obj) {
-    let result = dart._getRuntimeType(obj);
-    if (result != null) return result;
-    result = dart.getExtensionType(obj);
-    if (result != null) return result;
-    result = obj.constructor;
-    if (result === Function) {
-      return dart.jsobject;
-    }
-    if (result == null) {
-      return dart.jsobject;
-    }
+  dart.dindex = function(obj, index) {
+    return dart._callMethod(obj, 'get', null, [index], '[]');
+  };
+  dart.dsetindex = function(obj, index, value) {
+    return dart._callMethod(obj, 'set', null, [index, value], '[]=');
+  };
+  dart._ignoreMemo = function(f) {
+    let memo = new Map();
+    return (t1, t2) => {
+      let map = memo.get(t1);
+      let result;
+      if (map) {
+        result = map.get(t2);
+        if (result !== void 0) return result;
+      } else {
+        memo.set(t1, map = new Map());
+      }
+      result = f(t1, t2);
+      map.set(t2, result);
+      return result;
+    };
+  };
+  dart.strongInstanceOf = function(obj, type, ignoreFromWhiteList) {
+    let actual = dart.getReifiedType(obj);
+    let result = dart.isSubtype(actual, type);
+    if (result || actual == dart.jsobject || actual == core.int && type == core.double) return true;
+    if (result === false) return false;
+    if (ignoreFromWhiteList == void 0) return result;
+    if (dart._ignoreTypeFailure(actual, type)) return true;
     return result;
   };
-  dart.wrapType = function(type) {
-    if (type.hasOwnProperty(dart._typeObject)) {
-      return type[dart._typeObject];
-    }
-    return type[dart._typeObject] = new dart.WrappedType(type);
+  dart.instanceOfOrNull = function(obj, type) {
+    if (obj == null || dart.strongInstanceOf(obj, type, true)) return true;
+    return false;
   };
-  const _runtimeType = Symbol('_runtimeType');
-  dart.unwrapType = function(obj) {
-    return dart.dload(obj, _runtimeType);
+  dart.is = function(obj, type) {
+    let result = dart.strongInstanceOf(obj, type);
+    if (result !== null) return result;
+    let actual = dart.getReifiedType(obj);
+    dart.throwStrongModeError('Strong mode is-check failure: ' + dart.typeName(actual) + ' does not soundly subtype ' + dart.typeName(type));
   };
-  dart._getRuntimeType = function(value) {
-    return value[dart._runtimeType];
+  dart.as = function(obj, type) {
+    if (type == dart.dynamic || obj == null) return obj;
+    let result = dart.strongInstanceOf(obj, type, true);
+    if (result) return obj;
+    dart._throwCastError(obj, type, result);
   };
-  dart.tag = function(value, t) {
-    value[dart._runtimeType] = t;
+  dart.check = function(obj, type) {
+    if (type == dart.dynamic || obj == null) return obj;
+    let result = dart.strongInstanceOf(obj, type, true);
+    if (result) return obj;
+    dart._throwTypeError(obj, type, result);
+  };
+  dart.test = function(obj) {
+    if (typeof obj == 'boolean') return obj;
+    return dart.booleanConversionFailed(obj);
+  };
+  dart.booleanConversionFailed = function(obj) {
+    if (obj == null) {
+      dart.throw(new _js_helper.BooleanConversionAssertionError());
+    }
+    let actual = dart.getReifiedType(obj);
+    let expected = core.bool;
+    dart.throw(new _js_helper.TypeErrorImplementation.fromMessage(dart.str`type '${dart.typeName(actual)}' is not a subtype of ` + dart.str`type '${dart.typeName(expected)}' in boolean expression`));
+  };
+  dart._throwCastError = function(obj, type, result) {
+    let actual = dart.getReifiedType(obj);
+    if (result == false) dart.throwCastError(obj, actual, type);
+    dart.throwStrongModeCastError(obj, actual, type);
   };
-  dart.tagComputed = function(value, compute) {
-    dart.defineProperty(value, dart._runtimeType, {get: compute});
+  dart._throwTypeError = function(obj, type, result) {
+    let actual = dart.getReifiedType(obj);
+    if (result == false) dart.throwTypeError(obj, actual, type);
+    dart.throwStrongModeTypeError(obj, actual, type);
   };
-  dart.tagLazy = function(value, compute) {
-    dart.defineLazyProperty(value, dart._runtimeType, {get: compute});
+  dart.asInt = function(obj) {
+    if (obj == null) return null;
+    if (Math.floor(obj) != obj) {
+      dart.throwCastError(obj, dart.getReifiedType(obj), core.int);
+    }
+    return obj;
   };
-  dart._initialize2 = function() {
-    dart.TypeRep.prototype.is = function is_T(object) {
+  dart.addSimpleTypeTests = function(ctor) {
+    ctor.is = function is_C(object) {
+      if (object instanceof this) return true;
       return dart.is(object, this);
     };
-    dart.TypeRep.prototype.as = function as_T(object) {
+    ctor.as = function as_C(object) {
+      if (object instanceof this) return object;
       return dart.as(object, this);
     };
-    dart.TypeRep.prototype._check = function check_T(object) {
+    ctor._check = function check_C(object) {
+      if (object instanceof this) return object;
       return dart.check(object, this);
     };
-    dart.Dynamic.prototype.is = function is_Dynamic(object) {
-      return true;
+  };
+  dart.addTypeTests = function(ctor) {
+    ctor.as = function as_G(object) {
+      return dart.as(object, this);
     };
-    dart.Dynamic.prototype.as = function as_Dynamic(object) {
-      return object;
+    ctor.is = function is_G(object) {
+      return dart.is(object, this);
     };
-    dart.Dynamic.prototype._check = function check_Dynamic(object) {
-      return object;
+    ctor._check = function check_G(object) {
+      return dart.check(object, this);
     };
   };
-  dart._functionType = function(definite, returnType, args, extra) {
-    if (args === void 0 && extra === void 0) {
-      const fnTypeParts = returnType;
-      function makeGenericFnType(...types) {
-        let parts = fnTypeParts.apply(null, types);
-        return dart.FunctionType.create(definite, parts[0], parts[1], parts[2]);
-      }
-      makeGenericFnType[dart._typeFormalCount] = fnTypeParts.length;
-      return makeGenericFnType;
-    }
-    return dart.FunctionType.create(definite, returnType, args, extra);
-  };
-  dart.functionType = function(returnType, args, extra) {
-    return dart._functionType(false, returnType, args, extra);
+  dart.equals = function(x, y) {
+    if (x == null || y == null) return x == y;
+    let eq = x['=='];
+    return eq ? eq.call(x, y) : x === y;
   };
-  dart.definiteFunctionType = function(returnType, args, extra) {
-    return dart._functionType(true, returnType, args, extra);
+  dart.notNull = function(x) {
+    if (x == null) dart.throwNullValueError();
+    return x;
   };
-  dart.typedef = function(name, closure) {
-    return new dart.Typedef(name, closure);
+  dart.map = function(values, K, V) {
+    if (K === void 0) K = null;
+    if (V === void 0) V = null;
+    return (() => {
+      if (K == null) K = dart.dynamic;
+      if (V == null) V = dart.dynamic;
+      let map = dart.getGenericClass(collection.LinkedHashMap)(K, V).new();
+      if (Array.isArray(values)) {
+        for (let i = 0, end = values.length - 1; i < end; i += 2) {
+          let key = values[i];
+          let value = values[i + 1];
+          map.set(key, value);
+        }
+      } else if (typeof values === 'object') {
+        for (let key of dart.getOwnPropertyNames(values)) {
+          map.set(key, values[key]);
+        }
+      }
+      return map;
+    })();
   };
-  dart.isDartType = function(type) {
-    return dart._getRuntimeType(type) === core.Type;
+  dart.assert = function(condition) {
+    if (!condition) dart.throwAssertionError();
   };
-  dart.typeName = function(type) {
-    if (type === void 0) return "undefined type";
-    if (type === null) return "null type";
-    if (type instanceof dart.TypeRep) {
-      if (type instanceof dart.Typedef) {
-        return type.name + "(" + type.functionType.toString() + ")";
-      }
-      return type.toString();
-    }
-    let tag = dart._getRuntimeType(type);
-    if (tag === core.Type) {
-      let name = type.name;
-      let args = dart.getGenericArgs(type);
-      if (!args) return name;
-      let result = name;
-      let allDynamic = true;
-      result += '<';
-      for (let i = 0; i < args.length; ++i) {
-        if (i > 0) result += ', ';
-        let argName = dart.typeName(args[i]);
-        if (argName != 'dynamic') allDynamic = false;
-        result += argName;
-      }
-      result += '>';
-      if (allDynamic) return name;
-      return result;
+  dart.throw = function(obj) {
+    if (obj != null && (typeof obj == 'object' || typeof obj == 'function')) {
+      dart._stack.set(obj, new Error());
     }
-    if (tag) return "Not a type: " + tag.name;
-    return "JSObject<" + type.name + ">";
+    throw obj;
   };
-  dart.getImplicitFunctionType = function(type) {
-    if (dart.test(dart.isFunctionType(type))) return type;
-    return dart.getMethodTypeFromType(type, 'call');
+  dart.getError = function(exception) {
+    var stack = dart._stack.get(exception);
+    return stack !== void 0 ? stack : exception;
   };
-  dart.isFunctionType = function(type) {
-    return type instanceof dart.AbstractFunctionType || type === core.Function;
+  dart.stackPrint = function(exception) {
+    var error = dart.getError(exception);
+    console.log(error.stack ? error.stack : 'No stack trace for: ' + error);
   };
-  dart.isFunctionSubtype = function(ft1, ft2, covariant) {
-    if (ft2 === core.Function) {
-      return true;
-    }
-    if (ft1 === core.Function) {
-      return false;
-    }
-    let ret1 = ft1.returnType;
-    let ret2 = ft2.returnType;
-    let args1 = ft1.args;
-    let args2 = ft2.args;
-    if (args1.length > args2.length) {
-      return covariant ? false : null;
+  dart.stackTrace = function(exception) {
+    var error = dart.getError(exception);
+    return _js_helper.getTraceFromException(error);
+  };
+  dart.nullSafe = function(obj, ...callbacks) {
+    if (obj == null) return obj;
+    for (const callback of callbacks) {
+      obj = callback(obj);
+      if (obj == null) break;
     }
-    for (let i = 0; i < args1.length; ++i) {
-      if (!dart._isSubtype(args2[i], args1[i], !covariant)) {
-        return null;
+    return obj;
+  };
+  dart.multiKeyPutIfAbsent = function(map, keys, valueFn) {
+    for (let k of keys) {
+      let value = map.get(k);
+      if (!value) {
+        map.set(k, value = new Map());
       }
+      map = value;
     }
-    let optionals1 = ft1.optionals;
-    let optionals2 = ft2.optionals;
-    if (args1.length + optionals1.length < args2.length + optionals2.length) {
-      return covariant ? false : null;
+    if (map.has(dart._value)) return map.get(dart._value);
+    let value = valueFn();
+    map.set(dart._value, value);
+    return value;
+  };
+  dart.const = function(obj) {
+    function lookupNonTerminal(map, key) {
+      let result = map.get(key);
+      if (result !== void 0) return result;
+      map.set(key, result = new Map());
+      return result;
     }
-    let j = 0;
-    for (let i = args1.length; i < args2.length; ++i, ++j) {
-      if (!dart._isSubtype(args2[i], optionals1[j], !covariant)) {
-        return null;
-      }
+    let names = dart.getOwnNamesAndSymbols(obj);
+    let count = names.length;
+    let map = lookupNonTerminal(dart.constants, count);
+    for (let i = 0; i < count; i++) {
+      let name = names[i];
+      map = lookupNonTerminal(map, name);
+      map = lookupNonTerminal(map, obj[name]);
     }
-    for (let i = 0; i < optionals2.length; ++i, ++j) {
-      if (!dart._isSubtype(optionals2[i], optionals1[j], !covariant)) {
-        return null;
-      }
+    let type = dart.getReifiedType(obj);
+    let value = map.get(type);
+    if (value) return value;
+    map.set(type, obj);
+    return obj;
+  };
+  dart.constList = function(elements, elementType) {
+    function lookupNonTerminal(map, key) {
+      let result = map.get(key);
+      if (result !== void 0) return result;
+      map.set(key, result = new Map());
+      return result;
     }
-    let named1 = ft1.named;
-    let named2 = ft2.named;
-    let names = dart.getOwnPropertyNames(named2);
-    for (let i = 0; i < names.length; ++i) {
-      let name = names[i];
-      let n1 = named1[name];
-      let n2 = named2[name];
-      if (n1 === void 0) {
-        return covariant ? false : null;
-      }
-      if (!dart._isSubtype(n2, n1, !covariant)) {
-        return null;
-      }
+    let count = elements.length;
+    let map = lookupNonTerminal(dart.constantLists, count);
+    for (let i = 0; i < count; i++) {
+      map = lookupNonTerminal(map, elements[i]);
     }
-    if (ret2 === dart.void) return true;
-    if (ret1 === dart.void) return ret2 === dart.dynamic;
-    if (!dart._isSubtype(ret1, ret2, covariant)) return null;
-    return true;
+    let value = map.get(elementType);
+    if (value) return value;
+    value = dart.list(elements, elementType);
+    map.set(elementType, value);
+    return value;
   };
-  dart._subtypeMemo = function(f) {
-    let memo = new Map();
-    return (t1, t2) => {
-      let map = memo.get(t1);
-      let result;
-      if (map) {
-        result = map.get(t2);
-        if (result !== void 0) return result;
-      } else {
-        memo.set(t1, map = new Map());
+  dart.hashCode = function(obj) {
+    if (obj == null) return 0;
+    switch (typeof obj) {
+      case "number":
+      {
+        return obj & 0x1FFFFFFF;
+      }
+      case "boolean":
+      {
+        return obj ? 2 * 3 * 23 * 3761 : 269 * 811;
+      }
+      case "function":
+      {
+        return _js_helper.Primitives.objectHashCode(obj);
       }
-      result = f(t1, t2);
-      map.set(t2, result);
-      return result;
-    };
-  };
-  dart._isBottom = function(type) {
-    return type == dart.bottom;
-  };
-  dart._isTop = function(type) {
-    return type == core.Object || type == dart.dynamic;
-  };
-  dart._isSubtype = function(t1, t2, covariant) {
-    if (t1 === t2) return true;
-    if (dart._isTop(t2) || dart._isBottom(t1)) {
-      return true;
     }
-    if (dart._isBottom(t2)) return null;
-    if (dart._isTop(t1)) {
-      if (t1 === dart.dynamic) return null;
-      return false;
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.hashCode];
     }
-    if (!(t1 instanceof dart.AbstractFunctionType) && !(t2 instanceof dart.AbstractFunctionType)) {
-      let result = dart.isClassSubType(t1, t2, covariant);
-      if (result === true || result === null) return result;
+    return obj.hashCode;
+  };
+  dart.toString = function(obj) {
+    if (obj == null) return "null";
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.toString]();
     }
-    t1 = dart.getImplicitFunctionType(t1);
-    if (!t1) return false;
-    if (dart.isFunctionType(t1) && dart.isFunctionType(t2)) {
-      return dart.isFunctionSubtype(t1, t2, covariant);
+    if (typeof obj == "function") {
+      return "Closure: " + dart.getReifiedType(obj) + " from: " + obj;
     }
-    return false;
+    return obj.toString();
   };
-  dart.isClassSubType = function(t1, t2, covariant) {
-    if (t1 == t2) return true;
-    if (t1 == core.Object) return false;
-    if (t1 == null) return t2 == core.Object || t2 == dart.dynamic;
-    let raw1 = dart.getGenericClass(t1);
-    let raw2 = dart.getGenericClass(t2);
-    if (raw1 != null && raw1 == raw2) {
-      let typeArguments1 = dart.getGenericArgs(t1);
-      let typeArguments2 = dart.getGenericArgs(t2);
-      let length = typeArguments1.length;
-      if (typeArguments2.length == 0) {
-        return true;
-      } else if (length == 0) {
-        if (typeArguments2.every(dart._isTop)) return true;
-        return null;
-      }
-      dart.assert(length == typeArguments2.length);
-      for (let i = 0; i < length; ++i) {
-        let result = dart._isSubtype(typeArguments1[i], typeArguments2[i], covariant);
-        if (!result) {
-          return result;
-        }
-      }
-      return true;
+  dart.noSuchMethod = function(obj, invocation) {
+    if (obj == null || typeof obj == "function") {
+      dart.throw(new core.NoSuchMethodError(obj, invocation.memberName, invocation.positionalArguments, invocation.namedArguments));
     }
-    let indefinite = false;
-    function definitive(t1, t2) {
-      let result = dart.isClassSubType(t1, t2, covariant);
-      if (result == null) {
-        indefinite = true;
-        return false;
-      }
-      return result;
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.noSuchMethod](invocation);
     }
-    if (definitive(t1.__proto__, t2)) return true;
-    let mixins = dart.getMixins(t1);
-    if (mixins) {
-      for (let m1 of mixins) {
-        if (m1 != null && definitive(m1, t2)) return true;
-      }
+    return obj.noSuchMethod(invocation);
+  };
+  dart.constFn = function(x) {
+    return () => x;
+  };
+  dart.runtimeType = function(obj) {
+    let result = dart._checkPrimitiveType(obj);
+    if (result != null) return dart.wrapType(result);
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.runtimeType];
     }
-    let getInterfaces = dart.getImplements(t1);
-    if (getInterfaces) {
-      for (let i1 of getInterfaces()) {
-        if (i1 != null && definitive(i1, t2)) return true;
-      }
+    if (typeof obj == "function") {
+      return dart.wrapType(dart.getReifiedType(obj));
     }
-    if (indefinite) return null;
-    return false;
+    return obj.runtimeType;
   };
-  dart.isGroundType = function(type) {
-    if (type instanceof dart.AbstractFunctionType) {
-      if (!dart._isTop(type.returnType)) return false;
-      for (let i = 0; i < type.args.length; ++i) {
-        if (!dart._isBottom(type.args[i])) return false;
-      }
-      for (let i = 0; i < type.optionals.length; ++i) {
-        if (!dart._isBottom(type.optionals[i])) return false;
-      }
-      let names = dart.getOwnPropertyNames(type.named);
-      for (let i = 0; i < names.length; ++i) {
-        if (!dart._isBottom(type.named[names[i]])) return false;
-      }
-      return true;
+  dart.str = function(strings, ...values) {
+    let s = strings[0];
+    for (let i = 0, len = values.length; i < len;) {
+      s += dart.notNull(dart.toString(values[i])) + strings[++i];
     }
-    let typeArgs = dart.getGenericArgs(type);
-    if (!typeArgs) return true;
-    for (let t of typeArgs) {
-      if (t != core.Object && t != dart.dynamic) return false;
+    return s;
+  };
+  dart._canonicalMember = function(obj, name) {
+    if (typeof name === "symbol") return name;
+    if (obj != null && dart.getExtensionType(obj) != null) {
+      return dartx[name];
     }
-    return true;
+    if (dart.equals(name, 'constructor') || dart.equals(name, 'prototype')) {
+      name = '+' + dart.notNull(core.String._check(name));
+    }
+    return name;
   };
   dart.defineProperty = function(obj, name, desc) {
     return Object.defineProperty(obj, name, desc);
@@ -1773,198 +1783,58 @@ dart_library.library('dart_sdk', null, /* Imports */[
       if (init == null) return value;
       let f = init;
       init = circularInitError;
-      lazySetter(f());
-      return value;
-    }
-    desc.get = lazyGetter;
-    desc.configurable = true;
-    if (desc.set) desc.set = lazySetter;
-    return dart.defineProperty(to, name, desc);
-  };
-  dart.defineLazy = function(to, from) {
-    for (let name of dart.getOwnNamesAndSymbols(from)) {
-      dart.defineLazyProperty(to, name, dart.getOwnPropertyDescriptor(from, name));
-    }
-  };
-  dart.defineMemoizedGetter = function(obj, name, getter) {
-    return dart.defineLazyProperty(obj, name, {get: getter});
-  };
-  dart.copyTheseProperties = function(to, from, names) {
-    for (let i = 0; i < names.length; ++i) {
-      dart.copyProperty(to, from, names[i]);
-    }
-    return to;
-  };
-  dart.copyProperty = function(to, from, name) {
-    let desc = dart.getOwnPropertyDescriptor(from, name);
-    if (name == Symbol.iterator) {
-      let existing = dart.getOwnPropertyDescriptor(to, name);
-      if (existing != null) {
-        if (existing.writable) {
-          to[name] = desc.value;
-        }
-        return;
-      }
-    }
-    dart.defineProperty(to, name, desc);
-  };
-  dart.export = function(to, from, name) {
-    return dart.copyProperty(to, from, name);
-  };
-  dart.copyProperties = function(to, from) {
-    return dart.copyTheseProperties(to, from, dart.getOwnNamesAndSymbols(from));
-  };
-  dart.global = typeof window == "undefined" ? global : window;
-  dart.JsSymbol = Symbol;
-  dart._mixins = Symbol("mixins");
-  dart.implements = Symbol("implements");
-  dart._typeArguments = Symbol("typeArguments");
-  dart._originalDeclaration = Symbol("originalDeclaration");
-  dart._constructorSig = Symbol("sigCtor");
-  dart._methodSig = Symbol("sig");
-  dart._staticSig = Symbol("sigStatic");
-  dart._extensionType = Symbol("extensionType");
-  dart.dartx = dartx;
-  dart._jsIterator = Symbol("_jsIterator");
-  dart._current = Symbol("_current");
-  dart._AsyncStarStreamController = class _AsyncStarStreamController {
-    constructor(generator, T, args) {
-      this.isAdding = false;
-      this.isWaiting = false;
-      this.isScheduled = false;
-      this.isSuspendedAtYield = false;
-      this.canceler = null;
-      this.iterator = generator(this, ...args)[Symbol.iterator]();
-      this.controller = dart.getGenericClass(async.StreamController)(T).new({
-        onListen: () => this.scheduleGenerator(),
-        onResume: () => this.onResume(),
-        onCancel: () => this.onCancel()
-      });
-    }
-    onResume() {
-      if (this.isSuspendedAtYield) {
-        this.scheduleGenerator();
-      }
-    }
-    onCancel() {
-      if (this.controller.isClosed) {
-        return null;
-      }
-      if (this.canceler == null) {
-        this.canceler = async.Completer.new();
-        this.scheduleGenerator();
-      }
-      return this.canceler.future;
-    }
-    close() {
-      if (this.canceler != null && !this.canceler.isCompleted) {
-        this.canceler.complete();
-      }
-      this.controller.close();
-    }
-    scheduleGenerator() {
-      if (this.isScheduled || this.controller.isPaused || this.isAdding || this.isWaiting) {
-        return;
-      }
-      this.isScheduled = true;
-      async.scheduleMicrotask(() => this.runBody());
-    }
-    runBody(opt_awaitValue) {
-      this.isScheduled = false;
-      this.isSuspendedAtYield = false;
-      this.isWaiting = false;
-      let iter;
-      try {
-        iter = this.iterator.next(opt_awaitValue);
-      } catch (e) {
-        this.addError(e, dart.stackTrace(e));
-        this.close();
-        return;
-      }
-
-      if (iter.done) {
-        this.close();
-        return;
-      }
-      if (this.isSuspendedAtYield || this.isAdding) return;
-      this.isWaiting = true;
-      let future = iter.value;
-      if (!dart.is(future, dart.getGenericClass(async.Future))) {
-        future = async.Future.value(future);
-      }
-      return future.then(dart.dynamic)(x => this.runBody(x), {
-        onError: (e, s) => this.throwError(e, s)
-      });
-    }
-    add(event) {
-      if (!this.controller.hasListener) return true;
-      this.controller.add(event);
-      this.scheduleGenerator();
-      this.isSuspendedAtYield = true;
-      return false;
+      lazySetter(f());
+      return value;
     }
-    addStream(stream) {
-      if (!this.controller.hasListener) return true;
-      this.isAdding = true;
-      this.controller.addStream(stream, {cancelOnError: false}).then(dart.dynamic)(() => {
-        this.isAdding = false;
-        this.scheduleGenerator();
-      }, {
-        onError: (e, s) => this.throwError(e, s)
-      });
+    desc.get = lazyGetter;
+    desc.configurable = true;
+    if (desc.set) desc.set = lazySetter;
+    return dart.defineProperty(to, name, desc);
+  };
+  dart.defineLazy = function(to, from) {
+    for (let name of dart.getOwnNamesAndSymbols(from)) {
+      dart.defineLazyProperty(to, name, dart.getOwnPropertyDescriptor(from, name));
     }
-    throwError(error, stackTrace) {
-      try {
-        this.iterator.throw(error);
-      } catch (e) {
-        this.addError(e, stackTrace);
-      }
-
+  };
+  dart.defineMemoizedGetter = function(obj, name, getter) {
+    return dart.defineLazyProperty(obj, name, {get: getter});
+  };
+  dart.copyTheseProperties = function(to, from, names) {
+    for (let i = 0; i < names.length; ++i) {
+      dart.copyProperty(to, from, names[i]);
     }
-    addError(error, stackTrace) {
-      if (this.canceler != null && !this.canceler.isCompleted) {
-        this.canceler.completeError(error, stackTrace);
+    return to;
+  };
+  dart.copyProperty = function(to, from, name) {
+    let desc = dart.getOwnPropertyDescriptor(from, name);
+    if (name == Symbol.iterator) {
+      let existing = dart.getOwnPropertyDescriptor(to, name);
+      if (existing != null) {
+        if (existing.writable) {
+          to[name] = desc.value;
+        }
         return;
       }
-      if (!this.controller.hasListener) return;
-      this.controller.addError(error, stackTrace);
     }
+    dart.defineProperty(to, name, desc);
   };
-  dart.defineLazy(dart, {
-    get _callMethodStats() {
-      return MapOfString$int().new();
-    },
-    set _callMethodStats(_) {}
-  });
-  dart.defineLazy(dart, {
-    get trackProfile() {
-      return dart.global.trackDdcProfile;
-    },
-    set trackProfile(_) {}
-  });
-  dart._ignoreTypeFailure = (() => {
-    return dart._ignoreMemo((actual, type) => {
-      if (!!dart.isSubtype(type, core.Iterable) && !!dart.isSubtype(actual, core.Iterable) || !!dart.isSubtype(type, async.Future) && !!dart.isSubtype(actual, async.Future) || !!dart.isSubtype(type, core.Map) && !!dart.isSubtype(actual, core.Map) || dart.isFunctionType(type) && dart.isFunctionType(actual) || !!dart.isSubtype(type, async.Stream) && !!dart.isSubtype(actual, async.Stream) || !!dart.isSubtype(type, async.StreamSubscription) && !!dart.isSubtype(actual, async.StreamSubscription)) {
-        console.warn('Ignoring cast fail from ' + dart.typeName(actual) + ' to ' + dart.typeName(type));
-        return true;
-      }
-      return false;
-    });
-  })();
-  dart._stack = new WeakMap();
-  dart._value = Symbol("_value");
-  dart.constants = new Map();
-  dart.constantLists = new Map();
-  dart.JsIterator = class JsIterator {
-    constructor(dartIterator) {
-      this.dartIterator = dartIterator;
-    }
-    next() {
-      let i = this.dartIterator;
-      let done = !i.moveNext();
-      return {done: done, value: done ? void 0 : i.current};
-    }
+  dart.export = function(to, from, name) {
+    return dart.copyProperty(to, from, name);
+  };
+  dart.copyProperties = function(to, from) {
+    return dart.copyTheseProperties(to, from, dart.getOwnNamesAndSymbols(from));
   };
+  dart.global = typeof window == "undefined" ? global : window;
+  dart.JsSymbol = Symbol;
+  dart._mixins = Symbol("mixins");
+  dart.implements = Symbol("implements");
+  dart._typeArguments = Symbol("typeArguments");
+  dart._originalDeclaration = Symbol("originalDeclaration");
+  dart._constructorSig = Symbol("sigCtor");
+  dart._methodSig = Symbol("sig");
+  dart._staticSig = Symbol("sigStatic");
+  dart._extensionType = Symbol("extensionType");
+  dart.dartx = dartx;
   dart._runtimeType = Symbol("_runtimeType");
   dart.metadata = Symbol("metadata");
   dart._typeObject = Symbol("typeObject");
@@ -2059,13 +1929,13 @@ dart_library.library('dart_sdk', null, /* Imports */[
     }
   };
   dart.jsobject = new dart.JSObject();
-  dart.WrappedType = class WrappedType extends dart.TypeRep {
-    new(runtimeType) {
-      this[_runtimeType] = runtimeType;
-      super.new();
+  core.Type = class Type extends core.Object {};
+  dart.WrappedType = class WrappedType extends core.Type {
+    new(wrappedType) {
+      this[_wrappedType] = wrappedType;
     }
     toString() {
-      return core.String._check(dart.typeName(this[_runtimeType]));
+      return core.String._check(dart.typeName(this[_wrappedType]));
     }
   };
   dart.setSignature(dart.WrappedType, {
@@ -2256,6 +2126,174 @@ dart_library.library('dart_sdk', null, /* Imports */[
   };
   dart._typeFormalCount = Symbol("_typeFormalCount");
   dart.isSubtype = dart._subtypeMemo((t1, t2) => t1 === t2 || dart._isSubtype(t1, t2, true));
+  dart._jsIterator = Symbol("_jsIterator");
+  dart._current = Symbol("_current");
+  dart._AsyncStarStreamController = class _AsyncStarStreamController {
+    constructor(generator, T, args) {
+      this.isAdding = false;
+      this.isWaiting = false;
+      this.isScheduled = false;
+      this.isSuspendedAtYield = false;
+      this.canceler = null;
+      this.iterator = generator(this, ...args)[Symbol.iterator]();
+      this.controller = dart.getGenericClass(async.StreamController)(T).new({
+        onListen: () => this.scheduleGenerator(),
+        onResume: () => this.onResume(),
+        onCancel: () => this.onCancel()
+      });
+    }
+    onResume() {
+      if (this.isSuspendedAtYield) {
+        this.scheduleGenerator();
+      }
+    }
+    onCancel() {
+      if (this.controller.isClosed) {
+        return null;
+      }
+      if (this.canceler == null) {
+        this.canceler = async.Completer.new();
+        this.scheduleGenerator();
+      }
+      return this.canceler.future;
+    }
+    close() {
+      if (this.canceler != null && !this.canceler.isCompleted) {
+        this.canceler.complete();
+      }
+      this.controller.close();
+    }
+    scheduleGenerator() {
+      if (this.isScheduled || this.controller.isPaused || this.isAdding || this.isWaiting) {
+        return;
+      }
+      this.isScheduled = true;
+      async.scheduleMicrotask(() => this.runBody());
+    }
+    runBody(opt_awaitValue) {
+      this.isScheduled = false;
+      this.isSuspendedAtYield = false;
+      this.isWaiting = false;
+      let iter;
+      try {
+        iter = this.iterator.next(opt_awaitValue);
+      } catch (e) {
+        this.addError(e, dart.stackTrace(e));
+        this.close();
+        return;
+      }
+
+      if (iter.done) {
+        this.close();
+        return;
+      }
+      if (this.isSuspendedAtYield || this.isAdding) return;
+      this.isWaiting = true;
+      let future = iter.value;
+      if (!dart.is(future, dart.getGenericClass(async.Future))) {
+        future = async.Future.value(future);
+      }
+      return future.then(dart.dynamic)(x => this.runBody(x), {
+        onError: (e, s) => this.throwError(e, s)
+      });
+    }
+    add(event) {
+      if (!this.controller.hasListener) return true;
+      this.controller.add(event);
+      this.scheduleGenerator();
+      this.isSuspendedAtYield = true;
+      return false;
+    }
+    addStream(stream) {
+      if (!this.controller.hasListener) return true;
+      this.isAdding = true;
+      this.controller.addStream(stream, {cancelOnError: false}).then(dart.dynamic)(() => {
+        this.isAdding = false;
+        this.scheduleGenerator();
+      }, {
+        onError: (e, s) => this.throwError(e, s)
+      });
+    }
+    throwError(error, stackTrace) {
+      try {
+        this.iterator.throw(error);
+      } catch (e) {
+        this.addError(e, stackTrace);
+      }
+
+    }
+    addError(error, stackTrace) {
+      if (this.canceler != null && !this.canceler.isCompleted) {
+        this.canceler.completeError(error, stackTrace);
+        return;
+      }
+      if (!this.controller.hasListener) return;
+      this.controller.addError(error, stackTrace);
+    }
+  };
+  core.Invocation = class Invocation extends core.Object {
+    get isAccessor() {
+      return dart.test(this.isGetter) || dart.test(this.isSetter);
+    }
+  };
+  dart._Invocation = class _Invocation extends core.Invocation {
+    new(memberName, positionalArguments, opts) {
+      let namedArguments = opts && 'namedArguments' in opts ? opts.namedArguments : null;
+      let isMethod = opts && 'isMethod' in opts ? opts.isMethod : false;
+      let isGetter = opts && 'isGetter' in opts ? opts.isGetter : false;
+      let isSetter = opts && 'isSetter' in opts ? opts.isSetter : false;
+      this.positionalArguments = positionalArguments;
+      this.isMethod = isMethod;
+      this.isGetter = isGetter;
+      this.isSetter = isSetter;
+      this.memberName = dart._dartSymbol(memberName);
+      this.namedArguments = dart._Invocation._namedArgsToSymbols(namedArguments);
+    }
+    static _namedArgsToSymbols(namedArgs) {
+      if (namedArgs == null) return dart.map();
+      return MapOfSymbol$dynamic().fromIterable(dart.getOwnPropertyNames(namedArgs), {key: dart._dartSymbol, value: dart.fn(k => namedArgs[k], dynamicTodynamic$())});
+    }
+  };
+  dart.setSignature(dart._Invocation, {
+    constructors: () => ({new: dart.definiteFunctionType(dart._Invocation, [core.String, core.List], {namedArguments: dart.dynamic, isMethod: core.bool, isGetter: core.bool, isSetter: core.bool})}),
+    statics: () => ({_namedArgsToSymbols: dart.definiteFunctionType(core.Map$(core.Symbol, dart.dynamic), [dart.dynamic])}),
+    names: ['_namedArgsToSymbols']
+  });
+  dart.defineLazy(dart, {
+    get _callMethodStats() {
+      return MapOfString$int().new();
+    },
+    set _callMethodStats(_) {}
+  });
+  dart.defineLazy(dart, {
+    get trackProfile() {
+      return dart.global.trackDdcProfile;
+    },
+    set trackProfile(_) {}
+  });
+  dart._ignoreTypeFailure = (() => {
+    return dart._ignoreMemo((actual, type) => {
+      if (!!dart.isSubtype(type, core.Iterable) && !!dart.isSubtype(actual, core.Iterable) || !!dart.isSubtype(type, async.Future) && !!dart.isSubtype(actual, async.Future) || !!dart.isSubtype(type, core.Map) && !!dart.isSubtype(actual, core.Map) || dart.isFunctionType(type) && dart.isFunctionType(actual) || !!dart.isSubtype(type, async.Stream) && !!dart.isSubtype(actual, async.Stream) || !!dart.isSubtype(type, async.StreamSubscription) && !!dart.isSubtype(actual, async.StreamSubscription)) {
+        console.warn('Ignoring cast fail from ' + dart.typeName(actual) + ' to ' + dart.typeName(type));
+        return true;
+      }
+      return false;
+    });
+  })();
+  dart._stack = new WeakMap();
+  dart._value = Symbol("_value");
+  dart.constants = new Map();
+  dart.constantLists = new Map();
+  dart.JsIterator = class JsIterator {
+    constructor(dartIterator) {
+      this.dartIterator = dartIterator;
+    }
+    next() {
+      let i = this.dartIterator;
+      let done = !i.moveNext();
+      return {done: done, value: done ? void 0 : i.current};
+    }
+  };
   dart.hasOwnProperty = Object.prototype.hasOwnProperty;
   _debugger.JsonMLConfig = class JsonMLConfig extends core.Object {
     new(name) {
@@ -2886,7 +2924,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.fn(_foreign_helper.JS_DART_OBJECT_CONSTRUCTOR, VoidTodynamic$());
   _foreign_helper.JS_INTERCEPTOR_CONSTANT = function(type) {
   };
-  dart.lazyFn(_foreign_helper.JS_INTERCEPTOR_CONSTANT, () => TypeTodynamic());
+  dart.fn(_foreign_helper.JS_INTERCEPTOR_CONSTANT, TypeTodynamic());
   _foreign_helper.JS_OPERATOR_IS_PREFIX = function() {
   };
   dart.lazyFn(_foreign_helper.JS_OPERATOR_IS_PREFIX, () => VoidToString$());
@@ -3044,7 +3082,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   });
   _interceptors.findInterceptorConstructorForType = function(type) {
   };
-  dart.lazyFn(_interceptors.findInterceptorConstructorForType, () => TypeTodynamic());
+  dart.fn(_interceptors.findInterceptorConstructorForType, TypeTodynamic());
   _interceptors.findConstructorForNativeSubclassType = function(type, name) {
   };
   dart.lazyFn(_interceptors.findConstructorForNativeSubclassType, () => TypeAndStringTodynamic());
@@ -11923,7 +11961,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   _js_helper.getRuntimeType = function(object) {
     return dart.getReifiedType(object);
   };
-  dart.lazyFn(_js_helper.getRuntimeType, () => dynamicToType());
+  dart.fn(_js_helper.getRuntimeType, dynamicToType());
   _js_helper.getIndex = function(array, index) {
     dart.assert(_js_helper.isJsArray(array));
     return array[index];
@@ -30352,11 +30390,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return _js_helper.objectHashCode(object);
   };
   dart.fn(core.identityHashCode, ObjectToint());
-  core.Invocation = class Invocation extends core.Object {
-    get isAccessor() {
-      return dart.test(this.isGetter) || dart.test(this.isSetter);
-    }
-  };
   core._Generator$ = dart.generic(E => {
     const _Generator = dart.typedef('_Generator', () => dart.functionType(E, [core.int]));
     return _Generator;
@@ -30920,7 +30953,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.setSignature(core.Symbol, {
     constructors: () => ({new: dart.definiteFunctionType(core.Symbol, [core.String])})
   });
-  core.Type = class Type extends core.Object {};
   const _userInfo = Symbol('_userInfo');
   const _host = Symbol('_host');
   const _port = Symbol('_port');