fix #552, Object members on native types

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 7bebddbe1f53ac6ef51e643b016676f83af01784..c109793cef864ad5a1bd0d04d7a6fa713bec96d9 100644
--- a/lib/runtime/dart_sdk.js
+++ b/lib/runtime/dart_sdk.js
@@ -30,8 +30,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   const web_audio = Object.create(null);
   const web_gl = Object.create(null);
   const web_sql = Object.create(null);
-  dart.global = typeof window == "undefined" ? global : window;
-  dart.JsSymbol = Symbol;
   dart.mixin = function(base, ...mixins) {
     class Mixin extends base {
       [base.name](...args) {
@@ -65,8 +63,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.getImplements = function(clazz) {
     return clazz[dart.implements];
   };
-  dart._typeArguments = Symbol("typeArguments");
-  dart._originalDeclaration = Symbol("originalDeclaration");
   dart.generic = function(typeConstructor) {
     let length = typeConstructor.length;
     if (length < 1) {
@@ -110,9 +106,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.getGenericArgs = function(type) {
     return dart.safeGetOwnProperty(type, dart._typeArguments);
   };
-  dart._constructorSig = Symbol("sigCtor");
-  dart._methodSig = Symbol("sig");
-  dart._staticSig = Symbol("sigStatic");
   dart.getMethodType = function(obj, name) {
     let type = obj == null ? core.Object : obj.__proto__.constructor;
     return dart.getMethodTypeFromType(type, name);
@@ -193,21 +186,30 @@ dart_library.library('dart_sdk', null, /* Imports */[
     ctor.prototype = proto;
     dart.defineProperty(clazz, name, {value: ctor, configurable: true});
   };
-  dart._extensionType = Symbol("extensionType");
   dart.getExtensionType = function(obj) {
     return obj[dart._extensionType];
   };
-  dart.dartx = dartx;
   dart.getExtensionSymbol = function(name) {
-    let sym = dart.dartx[name];
-    if (!sym) dart.dartx[name] = sym = Symbol('dartx.' + name.toString());
+    let sym = dartx[name];
+    if (sym == null) {
+      sym = Symbol("dartx." + name.toString());
+      dartx[name] = sym;
+    }
     return sym;
   };
   dart.defineExtensionNames = function(names) {
     return names.forEach(dart.getExtensionSymbol);
   };
   dart._installProperties = function(jsProto, extProto) {
-    if (extProto !== core.Object.prototype && extProto !== jsProto) {
+    let coreObjProto = core.Object.prototype;
+    if (extProto === coreObjProto) {
+      for (let name of dart.getOwnPropertyNames(coreObjProto)) {
+        let desc = dart.getOwnPropertyDescriptor(coreObjProto, name);
+        dart.defineProperty(jsProto, dart.getExtensionSymbol(name), desc);
+      }
+      return;
+    }
+    if (jsProto !== extProto) {
       dart._installProperties(jsProto, extProto.__proto__);
     }
     dart.copyTheseProperties(jsProto, extProto, dart.getOwnPropertySymbols(extProto));
@@ -266,8 +268,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.throwNullValueError = function() {
     dart.throw(new core.NoSuchMethodError(null, new core.Symbol('<Unexpected Null Value>'), null, null, null));
   };
-  dart._jsIterator = Symbol("_jsIterator");
-  dart._current = Symbol("_current");
   dart.syncStar = function(gen, E, ...args) {
     const SyncIterable_E = dart.getGenericClass(_js_helper.SyncIterable)(E);
     return new SyncIterable_E(gen, args);
@@ -294,109 +294,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return onValue();
     });
   };
-  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);
-    }
-  };
   dart.asyncStar = function(gen, T, ...args) {
     return new dart._AsyncStarStreamController(gen, T, args).controller.stream;
   };
@@ -599,7 +496,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.assert = function(condition) {
     if (!condition) dart.throwAssertionError();
   };
-  dart._stack = new WeakMap();
   dart.throw = function(obj) {
     if (obj != null && (typeof obj == 'object' || typeof obj == 'function')) {
       dart._stack.set(obj, new Error());
@@ -626,7 +522,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
     }
     return obj;
   };
-  dart._value = Symbol("_value");
   dart.multiKeyPutIfAbsent = function(map, keys, valueFn) {
     for (let k of keys) {
       let value = map.get(k);
@@ -640,7 +535,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
     map.set(dart._value, value);
     return value;
   };
-  dart.constants = new Map();
   dart.const = function(obj) {
     let objectKey = [dart.getReifiedType(obj)];
     for (let name of dart.getOwnNamesAndSymbols(obj)) {
@@ -650,51 +544,49 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return dart.multiKeyPutIfAbsent(dart.constants, objectKey, () => obj);
   };
   dart.hashCode = function(obj) {
-    if (obj == null) {
-      return 0;
-    }
+    if (obj == null) return 0;
     switch (typeof obj) {
       case "number":
-      case "boolean":
       {
         return obj & 0x1FFFFFFF;
       }
-      case "string":
+      case "boolean":
       {
-        return obj.length;
+        return obj ? 2 * 3 * 23 * 3761 : 269 * 811;
       }
     }
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.hashCode];
+    }
     return obj.hashCode;
   };
   dart.toString = function(obj) {
-    if (obj == null) {
-      return "null";
+    if (obj == null) return "null";
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.toString]();
     }
     return obj.toString();
   };
   dart.noSuchMethod = function(obj, invocation) {
     if (obj == null) {
-      dart.throwNoSuchMethod(obj, invocation.memberName, invocation.positionalArguments, invocation.namedArguments);
+      dart.throw(new core.NoSuchMethodError(null, invocation.memberName, invocation.positionalArguments, invocation.namedArguments));
     }
-    switch (typeof obj) {
-      case "number":
-      case "boolean":
-      case "string":
-      {
-        dart.throwNoSuchMethod(obj, invocation.memberName, invocation.positionalArguments, invocation.namedArguments);
-      }
+    let extension = dart.getExtensionType(obj);
+    if (extension != null) {
+      return obj[dartx.noSuchMethod](invocation);
     }
     return obj.noSuchMethod(invocation);
   };
-  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.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.fn = function(closure, rType, argsT, extras) {
     let t = null;
@@ -713,13 +605,9 @@ dart_library.library('dart_sdk', null, /* Imports */[
     });
     return closure;
   };
-  dart._runtimeType = Symbol("_runtimeType");
-  dart.checkPrimitiveType = function(obj) {
+  dart._checkPrimitiveType = function(obj) {
+    if (obj == null) return core.Null;
     switch (typeof obj) {
-      case "undefined":
-      {
-        return core.Null;
-      }
       case "number":
       {
         return Math.floor(obj) == obj ? core.int : core.double;
@@ -734,36 +622,27 @@ dart_library.library('dart_sdk', null, /* Imports */[
       }
       case "symbol":
       {
-        return Symbol;
+        return dart.jsobject;
       }
     }
-    if (obj === null) return core.Null;
     return null;
   };
-  dart.runtimeType = function(obj) {
-    let result = dart.checkPrimitiveType(obj);
-    if (result !== null) return dart.wrapType(result);
-    return obj.runtimeType;
-  };
   dart.getFunctionType = function(obj) {
     let args = Array(obj.length).fill(dart.dynamic);
-    return dart.definiteFunctionType(dart.bottom, args);
-  };
-  dart.objectRuntimeType = function(obj) {
-    return dart.wrapType(dart.getReifiedType(obj));
+    return dart.definiteFunctionType(dart.bottom, args, void 0);
   };
   dart.getReifiedType = function(obj) {
-    let result = dart.checkPrimitiveType(obj);
+    let result = dart._checkPrimitiveType(obj);
     if (result != null) return result;
     return dart._nonPrimitiveRuntimeType(obj);
   };
   dart._nonPrimitiveRuntimeType = function(obj) {
-    let result = obj[dart._runtimeType];
-    if (result) return result;
-    result = obj[dart._extensionType];
-    if (result) return result;
+    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) {
+    if (result === Function) {
       return dart.jsobject;
     }
     return result;
@@ -786,176 +665,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.tagLazy = function(value, compute) {
     dart.defineLazyProperty(value, dart._runtimeType, {get: compute});
   };
-  dart._mixins = Symbol("mixins");
-  dart.implements = Symbol("implements");
-  dart.metadata = Symbol("metadata");
-  dart._typeObject = Symbol("typeObject");
-  dart.TypeRep = class TypeRep {
-    get name() {
-      return this.toString();
-    }
-    get [dart._runtimeType]() {
-      return core.Type;
-    }
-  };
-  dart.Dynamic = class Dynamic extends dart.TypeRep {
-    toString() {
-      return "dynamic";
-    }
-  };
-  dart.dynamic = new dart.Dynamic();
-  dart.Void = class Void extends dart.TypeRep {
-    toString() {
-      return "void";
-    }
-  };
-  dart.void = new dart.Void();
-  dart.Bottom = class Bottom extends dart.TypeRep {
-    toString() {
-      return "bottom";
-    }
-  };
-  dart.bottom = new dart.Bottom();
-  dart.JSObject = class JSObject extends dart.TypeRep {
-    toString() {
-      return "NativeJavaScriptObject";
-    }
-  };
-  dart.jsobject = new dart.JSObject();
-  dart.WrappedType = class WrappedType extends dart.TypeRep {
-    constructor(type) {
-      super();
-      this._runtimeType = type;
-    }
-    toString() {
-      return dart.typeName(this._runtimeType);
-    }
-  };
-  dart.AbstractFunctionType = class AbstractFunctionType extends dart.TypeRep {
-    constructor() {
-      super();
-      this._stringValue = null;
-    }
-    toString() {
-      return this.name;
-    }
-    get name() {
-      if (this._stringValue) return this._stringValue;
-      let buffer = '(';
-      for (let i = 0; i < this.args.length; ++i) {
-        if (i > 0) {
-          buffer += ', ';
-        }
-        buffer += dart.typeName(this.args[i]);
-      }
-      if (this.optionals.length > 0) {
-        if (this.args.length > 0) buffer += ', ';
-        buffer += '[';
-        for (let i = 0; i < this.optionals.length; ++i) {
-          if (i > 0) {
-            buffer += ', ';
-          }
-          buffer += dart.typeName(this.optionals[i]);
-        }
-        buffer += ']';
-      } else if (Object.keys(this.named).length > 0) {
-        if (this.args.length > 0) buffer += ', ';
-        buffer += '{';
-        let names = dart.getOwnPropertyNames(this.named).sort();
-        for (let i = 0; i < names.length; ++i) {
-          if (i > 0) {
-            buffer += ', ';
-          }
-          buffer += names[i] + ': ' + dart.typeName(this.named[names[i]]);
-        }
-        buffer += '}';
-      }
-      buffer += ') -> ' + dart.typeName(this.returnType);
-      this._stringValue = buffer;
-      return buffer;
-    }
-  };
-  dart.FunctionType = class FunctionType extends dart.AbstractFunctionType {
-    constructor(definite, returnType, args, optionals, named) {
-      super();
-      this.definite = definite;
-      this.returnType = returnType;
-      this.args = args;
-      this.optionals = optionals;
-      this.named = named;
-      this.metadata = [];
-      function process(array, metadata) {
-        var result = [];
-        for (var i = 0; i < array.length; ++i) {
-          var arg = array[i];
-          if (arg instanceof Array) {
-            metadata.push(arg.slice(1));
-            result.push(arg[0]);
-          } else {
-            metadata.push([]);
-            result.push(arg);
-          }
-        }
-        return result;
-      }
-      this.args = process(this.args, this.metadata);
-      this.optionals = process(this.optionals, this.metadata);
-      this._canonize();
-    }
-    _canonize() {
-      if (this.definite) return;
-      function replace(a) {
-        return a == dart.dynamic ? dart.bottom : a;
-      }
-      this.args = this.args.map(replace);
-      if (this.optionals.length > 0) {
-        this.optionals = this.optionals.map(replace);
-      }
-      if (Object.keys(this.named).length > 0) {
-        let r = {};
-        for (let name of dart.getOwnPropertyNames(this.named)) {
-          r[name] = replace(this.named[name]);
-        }
-        this.named = r;
-      }
-    }
-  };
-  dart.Typedef = class Typedef extends dart.AbstractFunctionType {
-    constructor(name, closure) {
-      super();
-      this._name = name;
-      this._closure = closure;
-      this._functionType = null;
-    }
-    get definite() {
-      return this._functionType.definite;
-    }
-    get name() {
-      return this._name;
-    }
-    get functionType() {
-      if (!this._functionType) {
-        this._functionType = this._closure();
-      }
-      return this._functionType;
-    }
-    get returnType() {
-      return this.functionType.returnType;
-    }
-    get args() {
-      return this.functionType.args;
-    }
-    get optionals() {
-      return this.functionType.optionals;
-    }
-    get named() {
-      return this.functionType.named;
-    }
-    get metadata() {
-      return this.functionType.metadata;
-    }
-  };
-  dart._typeFormalCount = Symbol("_typeFormalCount");
   dart._functionType = function(definite, returnType, args, extra) {
     if (args === void 0 && extra === void 0) {
       const fnTypeParts = returnType;
@@ -1021,7 +730,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return "JSObject<" + type.name + ">";
   };
   dart.getImplicitFunctionType = function(type) {
-    if (dart.isFunctionType(type)) return type;
+    if (dart.notNull(dart.as(dart.isFunctionType(type), core.bool))) return type;

[Leaf, 2016/05/10 02:16:46]

The boolean conversion here is a little unfortunate.  I wonder if we should keep
this as JS until we have special case code to make it faster?

[Jennifer Messerly, 2016/05/10 17:26:39]

Good catch! 

I can get rid of the `bool` cast easily by adding a return type to
`isFunctionType`. Have done that in a few places already.

Less sure about the notNull check. I think we may assume all inline-JS returns
non-null (whether that's a fair assumption, I'm not sure :) ). So I can call
isFunctionType from JS to get rid of the cast. Another idea is to assume we do
not need notNull checks inside the special dart:_runtime library. 

I also filed https://github.com/dart-lang/dev_compiler/issues/560

I'll land it with the bool-return-type fix, but advice appreciated on how to
best proceed with the null check.

     return dart.getMethodTypeFromType(type, 'call');
   };
   dart.isFunctionType = function(type) {
@@ -1039,7 +748,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       return covariant ? false : null;
     }
     for (let i = 0; i < args1.length; ++i) {
-      if (!dart.isSubtype_(args2[i], args1[i], !covariant)) {
+      if (!dart._isSubtype(args2[i], args1[i], !covariant)) {
         return null;
       }
     }
@@ -1050,12 +759,12 @@ dart_library.library('dart_sdk', null, /* Imports */[
     }
     let j = 0;
     for (let i = args1.length; i < args2.length; ++i, ++j) {
-      if (!dart.isSubtype_(args2[i], optionals1[j], !covariant)) {
+      if (!dart._isSubtype(args2[i], optionals1[j], !covariant)) {
         return null;
       }
     }
     for (let i = 0; i < optionals2.length; ++i, ++j) {
-      if (!dart.isSubtype_(optionals2[i], optionals1[j], !covariant)) {
+      if (!dart._isSubtype(optionals2[i], optionals1[j], !covariant)) {
         return null;
       }
     }
@@ -1069,13 +778,13 @@ dart_library.library('dart_sdk', null, /* Imports */[
       if (n1 === void 0) {
         return covariant ? false : null;
       }
-      if (!dart.isSubtype_(n2, n1, !covariant)) {
+      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;
+    if (!dart._isSubtype(ret1, ret2, covariant)) return null;
     return true;
   };
   dart.canonicalType = function(t) {
@@ -1087,7 +796,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
     if (t === Boolean) return bool;
     return t;
   };
-  dart.subtypeMap = new Map();
   dart.isSubtype = function(t1, t2) {
     let map = dart.subtypeMap.get(t1);
     let result;
@@ -1097,7 +805,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     } else {
       dart.subtypeMap.set(t1, map = new Map());
     }
-    result = dart.isSubtype_(t1, t2, true);
+    result = dart._isSubtype(t1, t2, true);
     map.set(t2, result);
     return result;
   };
@@ -1107,7 +815,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart._isTop = function(type) {
     return type == core.Object || type == dart.dynamic;
   };
-  dart.isSubtype_ = function(t1, t2, covariant) {
+  dart._isSubtype = function(t1, t2, covariant) {
     t1 = dart.canonicalType(t1);
     t2 = dart.canonicalType(t2);
     if (t1 === t2) return true;
@@ -1150,7 +858,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       }
       dart.assert(length == typeArguments2.length);
       for (let i = 0; i < length; ++i) {
-        let result = dart.isSubtype_(typeArguments1[i], typeArguments2[i], covariant);
+        let result = dart._isSubtype(typeArguments1[i], typeArguments2[i], covariant);
         if (!result) {
           return result;
         }
@@ -1216,16 +924,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.getOwnPropertySymbols = function(obj) {
     return Object.getOwnPropertySymbols(obj);
   };
-  dart.hasOwnProperty = Object.prototype.hasOwnProperty;
-  dart.StrongModeError = (function() {
-    function StrongModeError(message) {
-      Error.call(this);
-      this.message = message;
-    }
-    ;
-    Object.setPrototypeOf(StrongModeError.prototype, Error.prototype);
-    return StrongModeError;
-  })();
   dart.throwStrongModeError = function(message) {
     throw new dart.StrongModeError(message);
   };
@@ -1296,6 +994,138 @@ dart_library.library('dart_sdk', null, /* Imports */[
   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;
+    }
+    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);
+    }
+  };
+  dart._stack = new WeakMap();
+  dart._value = Symbol("_value");
+  dart.constants = 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._runtimeType = Symbol("_runtimeType");
+  dart.metadata = Symbol("metadata");
+  dart._typeObject = Symbol("typeObject");
   core.Object = class Object {
     constructor() {
       let name = this.constructor.name;
@@ -1316,7 +1146,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       dart.throw(new core.NoSuchMethodError(this, invocation.memberName, invocation.positionalArguments, invocation.namedArguments));
     }
     get runtimeType() {
-      return dart.objectRuntimeType(this);
+      return dart.wrapType(dart.getReifiedType(this));
     }
   };
   dart.setSignature(core.Object, {
@@ -1327,6 +1157,184 @@ dart_library.library('dart_sdk', null, /* Imports */[
       noSuchMethod: [dart.dynamic, [core.Invocation]]
     })
   });
+  dart.TypeRep = class TypeRep extends core.Object {
+    get name() {
+      return this.toString();
+    }
+  };
+  dart.TypeRep[dart.implements] = () => [core.Type];
+  dart.Dynamic = class Dynamic extends dart.TypeRep {
+    toString() {
+      return 'dynamic';
+    }
+  };
+  dart.dynamic = new dart.Dynamic();
+  dart.Void = class Void extends dart.TypeRep {
+    toString() {
+      return 'void';
+    }
+  };
+  dart.void = new dart.Void();
+  dart.Bottom = class Bottom extends dart.TypeRep {
+    toString() {
+      return 'bottom';
+    }
+  };
+  dart.bottom = new dart.Bottom();
+  dart.JSObject = class JSObject extends dart.TypeRep {
+    toString() {
+      return 'NativeJavaScriptObject';
+    }
+  };
+  dart.jsobject = new dart.JSObject();
+  const _runtimeType = Symbol('_runtimeType');
+  dart.WrappedType = class WrappedType extends dart.TypeRep {
+    WrappedType(runtimeType) {
+      this[_runtimeType] = runtimeType;
+    }
+    toString() {
+      return dart.as(dart.typeName(this[_runtimeType]), core.String);
+    }
+  };
+  dart.setSignature(dart.WrappedType, {
+    constructors: () => ({WrappedType: [dart.WrappedType, [dart.dynamic]]})
+  });
+  dart.AbstractFunctionType = class AbstractFunctionType extends dart.TypeRep {
+    constructor() {
+      super();
+      this._stringValue = null;
+    }
+    toString() {
+      return this.name;
+    }
+    get name() {
+      if (this._stringValue) return this._stringValue;
+      let buffer = '(';
+      for (let i = 0; i < this.args.length; ++i) {
+        if (i > 0) {
+          buffer += ', ';
+        }
+        buffer += dart.typeName(this.args[i]);
+      }
+      if (this.optionals.length > 0) {
+        if (this.args.length > 0) buffer += ', ';
+        buffer += '[';
+        for (let i = 0; i < this.optionals.length; ++i) {
+          if (i > 0) {
+            buffer += ', ';
+          }
+          buffer += dart.typeName(this.optionals[i]);
+        }
+        buffer += ']';
+      } else if (Object.keys(this.named).length > 0) {
+        if (this.args.length > 0) buffer += ', ';
+        buffer += '{';
+        let names = dart.getOwnPropertyNames(this.named).sort();
+        for (let i = 0; i < names.length; ++i) {
+          if (i > 0) {
+            buffer += ', ';
+          }
+          buffer += names[i] + ': ' + dart.typeName(this.named[names[i]]);
+        }
+        buffer += '}';
+      }
+      buffer += ') -> ' + dart.typeName(this.returnType);
+      this._stringValue = buffer;
+      return buffer;
+    }
+  };
+  dart.FunctionType = class FunctionType extends dart.AbstractFunctionType {
+    constructor(definite, returnType, args, optionals, named) {
+      super();
+      this.definite = definite;
+      this.returnType = returnType;
+      this.args = args;
+      this.optionals = optionals;
+      this.named = named;
+      this.metadata = [];
+      function process(array, metadata) {
+        var result = [];
+        for (var i = 0; i < array.length; ++i) {
+          var arg = array[i];
+          if (arg instanceof Array) {
+            metadata.push(arg.slice(1));
+            result.push(arg[0]);
+          } else {
+            metadata.push([]);
+            result.push(arg);
+          }
+        }
+        return result;
+      }
+      this.args = process(this.args, this.metadata);
+      this.optionals = process(this.optionals, this.metadata);
+      this._canonize();
+    }
+    _canonize() {
+      if (this.definite) return;
+      function replace(a) {
+        return a == dart.dynamic ? dart.bottom : a;
+      }
+      this.args = this.args.map(replace);
+      if (this.optionals.length > 0) {
+        this.optionals = this.optionals.map(replace);
+      }
+      if (Object.keys(this.named).length > 0) {
+        let r = {};
+        for (let name of dart.getOwnPropertyNames(this.named)) {
+          r[name] = replace(this.named[name]);
+        }
+        this.named = r;
+      }
+    }
+  };
+  dart.Typedef = class Typedef extends dart.AbstractFunctionType {
+    constructor(name, closure) {
+      super();
+      this._name = name;
+      this._closure = closure;
+      this._functionType = null;
+    }
+    get definite() {
+      return this._functionType.definite;
+    }
+    get name() {
+      return this._name;
+    }
+    get functionType() {
+      if (!this._functionType) {
+        this._functionType = this._closure();
+      }
+      return this._functionType;
+    }
+    get returnType() {
+      return this.functionType.returnType;
+    }
+    get args() {
+      return this.functionType.args;
+    }
+    get optionals() {
+      return this.functionType.optionals;
+    }
+    get named() {
+      return this.functionType.named;
+    }
+    get metadata() {
+      return this.functionType.metadata;
+    }
+  };
+  dart._typeFormalCount = Symbol("_typeFormalCount");
+  dart.subtypeMap = new Map();
+  dart.hasOwnProperty = Object.prototype.hasOwnProperty;
+  dart.StrongModeError = (function() {
+    function StrongModeError(message) {
+      Error.call(this);
+      this.message = message;
+    }
+    ;
+    Object.setPrototypeOf(StrongModeError.prototype, Error.prototype);
+    return StrongModeError;
+  })();
   _debugger.skipDartConfig = dart.const(new core.Object());
   _debugger.maxIterableChildrenToDisplay = 50;
   dart.defineLazy(_debugger, {
@@ -2001,13 +2009,13 @@ dart_library.library('dart_sdk', null, /* Imports */[
     JSBool() {
       super.Interceptor();
     }
-    toString() {
+    [dartx.toString]() {
       return String(this);
     }
-    get hashCode() {
+    get [dartx.hashCode]() {
       return this ? 2 * 3 * 23 * 3761 : 269 * 811;
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(core.bool);
     }
   };
@@ -2581,7 +2589,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       get [dartx.isNotEmpty]() {
         return !dart.notNull(this[dartx.isEmpty]);
       }
-      toString() {
+      [dartx.toString]() {
         return collection.ListBase.listToString(this);
       }
       [dartx.toList](opts) {
@@ -2596,7 +2604,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       get [dartx.iterator]() {
         return new (_interceptors.ArrayIterator$(E))(this);
       }
-      get hashCode() {
+      get [dartx.hashCode]() {
         return _js_helper.Primitives.objectHashCode(this);
       }
       get [dartx.length]() {
@@ -2982,14 +2990,14 @@ dart_library.library('dart_sdk', null, /* Imports */[
       }
       return dart.notNull(result) + "0"[dartx['*']](exponent);
     }
-    toString() {
+    [dartx.toString]() {
       if (this == 0 && 1 / this < 0) {
         return '-0.0';
       } else {
         return "" + this;
       }
     }
-    get hashCode() {
+    get [dartx.hashCode]() {
       return this & 0x1FFFFFFF;
     }
     [dartx['unary-']]() {
@@ -3722,10 +3730,10 @@ dart_library.library('dart_sdk', null, /* Imports */[
       if (!(typeof other == 'string')) dart.throw(_js_helper.argumentErrorValue(other));
       return dart.equals(this, other) ? 0 : this < other ? -1 : 1;
     }
-    toString() {
+    [dartx.toString]() {
       return this;
     }
-    get hashCode() {
+    get [dartx.hashCode]() {
       let hash = 0;
       for (let i = 0; i < dart.notNull(this[dartx.length]); i++) {
         hash = 536870911 & hash + this.charCodeAt(i);
@@ -3736,7 +3744,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       hash = hash ^ hash >> 11;
       return 536870911 & hash + ((16383 & hash) << 15);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(core.String);
     }
     get [dartx.length]() {
@@ -7228,7 +7236,11 @@ dart_library.library('dart_sdk', null, /* Imports */[
     constructors: () => ({_IsolateEvent: [_isolate_helper._IsolateEvent, [_isolate_helper._IsolateContext, core.Function, core.String]]}),
     methods: () => ({process: [dart.void, []]})
   });
-  _isolate_helper._global = typeof global == 'undefined' ? self : global;
+  dart.defineLazy(_isolate_helper, {
+    get _global() {
+      return typeof global == 'undefined' ? self : global;
+    }
+  });
   _isolate_helper._MainManagerStub = class _MainManagerStub extends core.Object {
     postMessage(msg) {
       _isolate_helper._global.postMessage(msg);
@@ -10370,7 +10382,11 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return new _js_mirrors.JsClassMirror._(key);
   };
   dart.lazyFn(_js_mirrors.reflectType, () => [mirrors.TypeMirror, [core.Type]]);
-  _js_mirrors._dart = dart;
+  dart.defineLazy(_js_mirrors, {
+    get _dart() {
+      return dart;
+    }
+  });
   _js_mirrors._dload = function(obj, name) {
     return _js_mirrors._dart.dload(obj, name);
   };
@@ -10862,7 +10878,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     get [dartx.lengthInBytes]() {
       return this.byteLength;
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.ByteBuffer);
     }
     [dartx.asUint8List](offsetInBytes, length) {
@@ -11931,7 +11947,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeByteData._create2(buffer, offsetInBytes) : _native_typed_data.NativeByteData._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.ByteData);
     }
     get [dartx.elementSizeInBytes]() {
@@ -12131,7 +12147,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.setSignature(_native_typed_data.NativeTypedArray, {
     methods: () => ({[_setRangeFast]: [dart.void, [core.int, core.int, _native_typed_data.NativeTypedArray, core.int]]})
   });
-  dart.defineExtensionMembers(_native_typed_data.NativeTypedArray, [_setRangeFast]);
   dart.defineExtensionNames([
     'length',
     'get',
@@ -12220,7 +12235,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeFloat32List._create2(buffer, offsetInBytes) : _native_typed_data.NativeFloat32List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Float32List);
     }
     [dartx.sublist](start, end) {
@@ -12271,7 +12286,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeFloat64List._create2(buffer, offsetInBytes) : _native_typed_data.NativeFloat64List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Float64List);
     }
     [dartx.sublist](start, end) {
@@ -12323,7 +12338,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeInt16List._create2(buffer, offsetInBytes) : _native_typed_data.NativeInt16List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Int16List);
     }
     [dartx.get](index) {
@@ -12382,7 +12397,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeInt32List._create2(buffer, offsetInBytes) : _native_typed_data.NativeInt32List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Int32List);
     }
     [dartx.get](index) {
@@ -12441,7 +12456,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return dart.as(length == null ? _native_typed_data.NativeInt8List._create2(buffer, offsetInBytes) : _native_typed_data.NativeInt8List._create3(buffer, offsetInBytes, length), _native_typed_data.NativeInt8List);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Int8List);
     }
     [dartx.get](index) {
@@ -12500,7 +12515,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeUint16List._create2(buffer, offsetInBytes) : _native_typed_data.NativeUint16List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Uint16List);
     }
     [dartx.get](index) {
@@ -12559,7 +12574,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeUint32List._create2(buffer, offsetInBytes) : _native_typed_data.NativeUint32List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Uint32List);
     }
     [dartx.get](index) {
@@ -12619,7 +12634,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeUint8ClampedList._create2(buffer, offsetInBytes) : _native_typed_data.NativeUint8ClampedList._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Uint8ClampedList);
     }
     get [dartx.length]() {
@@ -12685,7 +12700,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       _native_typed_data._checkViewArguments(buffer, offsetInBytes, length);
       return length == null ? _native_typed_data.NativeUint8List._create2(buffer, offsetInBytes) : _native_typed_data.NativeUint8List._create3(buffer, offsetInBytes, length);
     }
-    get runtimeType() {
+    get [dartx.runtimeType]() {
       return dart.wrapType(typed_data.Uint8List);
     }
     get [dartx.length]() {
@@ -26644,7 +26659,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       let defaultValue = opts && 'defaultValue' in opts ? opts.defaultValue : false;
       dart.throw(new core.UnsupportedError('bool.fromEnvironment can only be used as a const constructor'));
     }
-    toString() {
+    [dartx.toString]() {
       return this ? "true" : "false";
     }
   };
@@ -29792,7 +29807,11 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.setSignature(isolate.Capability, {
     constructors: () => ({new: [isolate.Capability, []]})
   });
-  js._global = dart.global;
+  dart.defineLazy(js, {
+    get _global() {
+      return dart.global;
+    }
+  });
   dart.defineLazy(js, {
     get context() {
       return js._wrapToDart(js._global);
@@ -30152,8 +30171,16 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return new js.JsObject._fromJs(o);
   };
   dart.fn(js._wrapToDart, js.JsObject, [dart.dynamic]);
-  js._dartProxies = new WeakMap();
-  js._jsProxies = new WeakMap();
+  dart.defineLazy(js, {
+    get _dartProxies() {
+      return new WeakMap();
+    }
+  });
+  dart.defineLazy(js, {
+    get _jsProxies() {
+      return new WeakMap();
+    }
+  });
   js._putIfAbsent = function(weakMap, o, getValue) {
     let value = weakMap.get(o);
     if (value == null) {
@@ -32648,7 +32675,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
         this[_removeChild](this[dartx.firstChild]);
       }
     }
-    toString() {
+    [dartx.toString]() {
       let value = this[dartx.nodeValue];
       return value == null ? super.toString() : value;
     }
@@ -33192,7 +33219,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     get [dartx.namespaceUri]() {
       return this[_namespaceUri];
     }
-    toString() {
+    [dartx.toString]() {
       return this[dartx.localName];
     }
     [dartx.scrollIntoView](alignment) {
@@ -34542,7 +34569,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     set [dartx.username](value) {
       this.username = value;
     }
-    toString() {
+    [dartx.toString]() {
       return String(this);
     }
   };
@@ -35174,7 +35201,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     set [dartx.username](value) {
       this.username = value;
     }
-    toString() {
+    [dartx.toString]() {
       return String(this);
     }
   };
@@ -46245,7 +46272,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     get [dartx.message]() {
       return this.message;
     }
-    toString() {
+    [dartx.toString]() {
       return String(this);
     }
   };
@@ -46908,14 +46935,14 @@ dart_library.library('dart_sdk', null, /* Imports */[
     'y'
   ]);
   html$.DomRectReadOnly = class DomRectReadOnly extends _interceptors.Interceptor {
-    toString() {
+    [dartx.toString]() {
       return `Rectangle (${this[dartx.left]}, ${this[dartx.top]}) ${this[dartx.width]} x ${this[dartx.height]}`;
     }
-    ['=='](other) {
+    [dartx['==']](other) {
       if (!dart.is(other, math.Rectangle$(core.num))) return false;
       return dart.equals(this[dartx.left], dart.dload(other, 'left')) && dart.equals(this[dartx.top], dart.dload(other, 'top')) && dart.equals(this[dartx.width], dart.dload(other, 'width')) && dart.equals(this[dartx.height], dart.dload(other, 'height'));
     }
-    get hashCode() {
+    get [dartx.hashCode]() {
       return html$._JenkinsSmiHash.hash4(dart.hashCode(this[dartx.left]), dart.hashCode(this[dartx.top]), dart.hashCode(this[dartx.width]), dart.hashCode(this[dartx.height]));
     }
     [dartx.intersection](other) {
@@ -52754,7 +52781,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       }
       return `${this[dartx.protocol]}//${this[dartx.host]}`;
     }
-    toString() {
+    [dartx.toString]() {
       return String(this);
     }
   };
@@ -56323,7 +56350,6 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.setSignature(html$.ParentNode, {
     constructors: () => ({_: [html$.ParentNode, []]})
   });
-  dart.defineExtensionMembers(html$.ParentNode, [_childElementCount, _children, _firstElementChild, _lastElementChild]);
   html$.ParentNode[dart.metadata] = () => [dart.const(new _metadata.DocsEditable()), dart.const(new _metadata.DomName('ParentNode')), dart.const(new _metadata.Experimental())];
   dart.defineExtensionNames([
     'formData',
@@ -63366,7 +63392,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     static revokeObjectUrl(url) {
       return (self.URL || self.webkitURL).revokeObjectURL(url);
     }
-    toString() {
+    [dartx.toString]() {
       return String(this);
     }
     static _() {
@@ -66096,14 +66122,14 @@ dart_library.library('dart_sdk', null, /* Imports */[
     'width'
   ]);
   html$._ClientRect = class _ClientRect extends _interceptors.Interceptor {
-    toString() {
+    [dartx.toString]() {
       return `Rectangle (${this[dartx.left]}, ${this[dartx.top]}) ${this[dartx.width]} x ${this[dartx.height]}`;
     }
-    ['=='](other) {
+    [dartx['==']](other) {
       if (!dart.is(other, math.Rectangle$(core.num))) return false;
       return dart.equals(this[dartx.left], dart.dload(other, 'left')) && dart.equals(this[dartx.top], dart.dload(other, 'top')) && dart.equals(this[dartx.width], dart.dload(other, 'width')) && dart.equals(this[dartx.height], dart.dload(other, 'height'));
     }
-    get hashCode() {
+    get [dartx.hashCode]() {
       return html$._JenkinsSmiHash.hash4(dart.hashCode(this[dartx.left]), dart.hashCode(this[dartx.top]), dart.hashCode(this[dartx.width]), dart.hashCode(this[dartx.height]));
     }
     [dartx.intersection](other) {