fixes #52, fields shadowing getters/setters or other fields

lib/runtime/dart/core.js

Index: lib/runtime/dart/core.js
diff --git a/lib/runtime/dart/core.js b/lib/runtime/dart/core.js
index 9c781a03433c26852c7ec9e28c779e90be7df37f..c1f6f8eea3c8aff470908cc91c3afd9bd1ae944b 100644
--- a/lib/runtime/dart/core.js
+++ b/lib/runtime/dart/core.js
@@ -1,6 +1,7 @@
 var core;
 (function(exports) {
   'use strict';
+  let name$ = dart.JsSymbol('name');
   class Object {
     constructor() {
       let name = this.constructor.name;
@@ -27,24 +28,35 @@ var core;
     }
   }
   class JsName extends Object {
+    get name() {
+      return this[name$];
+    }
     JsName(opts) {
       let name = opts && 'name' in opts ? opts.name : null;
-      this.name = name;
+      this[name$] = name;
     }
   }
+  let name$0 = dart.JsSymbol('name');
   class JsPeerInterface extends Object {
+    get name() {
+      return this[name$0];
+    }
     JsPeerInterface(opts) {
       let name = opts && 'name' in opts ? opts.name : null;
-      this.name = name;
+      this[name$0] = name;
     }
   }
   class SupportJsExtensionMethod extends Object {
     SupportJsExtensionMethod() {
     }
   }
+  let expires$ = dart.JsSymbol('expires');
   class Deprecated extends Object {
+    get expires() {
+      return this[expires$];
+    }
     Deprecated(expires) {
-      this.expires = expires;
+      this[expires$] = expires;
     }
     toString() {
       return `Deprecated feature. Will be removed ${this.expires}`;
@@ -100,6 +112,8 @@ var core;
     return Comparable;
   });
   let Comparable = Comparable$();
+  let millisecondsSinceEpoch$ = dart.JsSymbol('millisecondsSinceEpoch');
+  let isUtc$ = dart.JsSymbol('isUtc');
   let _internal = dart.JsSymbol('_internal');
   let _now = dart.JsSymbol('_now');
   let _brokenDownDateToMillisecondsSinceEpoch = dart.JsSymbol('_brokenDownDateToMillisecondsSinceEpoch');
@@ -109,6 +123,12 @@ var core;
   let _threeDigits = dart.JsSymbol('_threeDigits');
   let _twoDigits = dart.JsSymbol('_twoDigits');
   class DateTime extends Object {
+    get millisecondsSinceEpoch() {
+      return this[millisecondsSinceEpoch$];
+    }
+    get isUtc() {
+      return this[isUtc$];
+    }
     DateTime(year, month, day, hour, minute, second, millisecond) {
       if (month === void 0)
         month = 1;
@@ -195,8 +215,8 @@ var core;
     }
     fromMillisecondsSinceEpoch(millisecondsSinceEpoch, opts) {
       let isUtc = opts && 'isUtc' in opts ? opts.isUtc : false;
-      this.millisecondsSinceEpoch = millisecondsSinceEpoch;
-      this.isUtc = isUtc;
+      this[millisecondsSinceEpoch$] = millisecondsSinceEpoch;
+      this[isUtc$] = isUtc;
       if (dart.notNull(millisecondsSinceEpoch.abs()) > dart.notNull(DateTime[_MAX_MILLISECONDS_SINCE_EPOCH])) {
         throw new ArgumentError(millisecondsSinceEpoch);
       }
@@ -307,12 +327,12 @@ var core;
       return new Duration({milliseconds: dart.notNull(ms) - dart.notNull(otherMs)});
     }
     [_internal](year, month, day, hour, minute, second, millisecond, isUtc) {
-      this.isUtc = typeof isUtc == 'boolean' ? isUtc : dart.throw_(new ArgumentError(isUtc));
-      this.millisecondsSinceEpoch = dart.as(_js_helper.checkInt(_js_helper.Primitives.valueFromDecomposedDate(year, month, day, hour, minute, second, millisecond, isUtc)), int);
+      this[isUtc$] = typeof isUtc == 'boolean' ? isUtc : dart.throw_(new ArgumentError(isUtc));
+      this[millisecondsSinceEpoch$] = dart.as(_js_helper.checkInt(_js_helper.Primitives.valueFromDecomposedDate(year, month, day, hour, minute, second, millisecond, isUtc)), int);
     }
     [_now]() {
-      this.isUtc = false;
-      this.millisecondsSinceEpoch = _js_helper.Primitives.dateNow();
+      this[isUtc$] = false;
+      this[millisecondsSinceEpoch$] = _js_helper.Primitives.dateNow();
     }
     static [_brokenDownDateToMillisecondsSinceEpoch](year, month, day, hour, minute, second, millisecond, isUtc) {
       return dart.as(_js_helper.Primitives.valueFromDecomposedDate(year, month, day, hour, minute, second, millisecond, isUtc), int);
@@ -582,15 +602,27 @@ var core;
       return "Throw of null.";
     }
   }
+  let invalidValue = dart.JsSymbol('invalidValue');
+  let name$1 = dart.JsSymbol('name');
+  let message$ = dart.JsSymbol('message');
   let _hasValue = dart.JsSymbol('_hasValue');
   class ArgumentError extends Error {
+    get invalidValue() {
+      return this[invalidValue];
+    }
+    get name() {
+      return this[name$1];
+    }
+    get message() {
+      return this[message$];
+    }
     ArgumentError(message) {
       if (message === void 0)
         message = null;
-      this.message = message;
-      this.invalidValue = null;
+      this[message$] = message;
+      this[invalidValue] = null;
       this[_hasValue] = false;
-      this.name = null;
+      this[name$1] = null;
       super.Error();
     }
     value(value, name, message) {
@@ -598,9 +630,9 @@ var core;
         name = null;
       if (message === void 0)
         message = "Invalid argument";
-      this.name = name;
-      this.message = message;
-      this.invalidValue = value;
+      this[name$1] = name;
+      this[message$] = message;
+      this[invalidValue] = value;
       this[_hasValue] = true;
       super.Error();
     }
@@ -626,10 +658,18 @@ var core;
   }
   dart.defineNamedConstructor(ArgumentError, 'value');
   dart.defineNamedConstructor(ArgumentError, 'notNull');
+  let start = dart.JsSymbol('start');
+  let end = dart.JsSymbol('end');
   class RangeError extends ArgumentError {
+    get start() {
+      return this[start];
+    }
+    get end() {
+      return this[end];
+    }
     RangeError(message) {
-      this.start = null;
-      this.end = null;
+      this[start] = null;
+      this[end] = null;
       super.ArgumentError(message);
     }
     value(value, name, message) {
@@ -637,8 +677,8 @@ var core;
         name = null;
       if (message === void 0)
         message = null;
-      this.start = null;
-      this.end = null;
+      this[start] = null;
+      this[end] = null;
       super.value(value, name, message != null ? message : "Value not in range");
     }
     range(invalidValue, minValue, maxValue, name, message) {
@@ -646,8 +686,8 @@ var core;
         name = null;
       if (message === void 0)
         message = null;
-      this.start = minValue;
-      this.end = maxValue;
+      this[start] = minValue;
+      this[end] = maxValue;
       super.value(invalidValue, name, message != null ? message : "Invalid value");
     }
     index(index, indexable, name, message, length) {
@@ -727,7 +767,15 @@ var core;
   dart.defineNamedConstructor(RangeError, 'value');
   dart.defineNamedConstructor(RangeError, 'range');
   dart.defineNamedConstructor(RangeError, 'index');
+  let indexable$ = dart.JsSymbol('indexable');
+  let length$ = dart.JsSymbol('length');
   class IndexError extends ArgumentError {
+    get indexable() {
+      return this[indexable$];
+    }
+    get length() {
+      return this[length$];
+    }
     IndexError(invalidValue, indexable, name, message, length) {
       if (name === void 0)
         name = null;
@@ -735,8 +783,8 @@ var core;
         message = null;
       if (length === void 0)
         length = null;
-      this.indexable = indexable;
-      this.length = dart.as(length != null ? length : dart.dload(indexable, 'length'), int);
+      this[indexable$] = indexable;
+      this[length$] = dart.as(length != null ? length : dart.dload(indexable, 'length'), int);
       super.value(invalidValue, name, message != null ? message : "Index out of range");
     }
     get start() {
@@ -827,20 +875,28 @@ var core;
       }
     }
   }
+  let message$0 = dart.JsSymbol('message');
   class UnsupportedError extends Error {
+    get message() {
+      return this[message$0];
+    }
     UnsupportedError(message) {
-      this.message = message;
+      this[message$0] = message;
       super.Error();
     }
     toString() {
       return `Unsupported operation: ${this.message}`;
     }
   }
+  let message$1 = dart.JsSymbol('message');
   class UnimplementedError extends Error {
+    get message() {
+      return this[message$1];
+    }
     UnimplementedError(message) {
       if (message === void 0)
         message = null;
-      this.message = message;
+      this[message$1] = message;
       super.Error();
     }
     toString() {
@@ -848,20 +904,28 @@ var core;
     }
   }
   UnimplementedError[dart.implements] = () => [UnsupportedError];
+  let message$2 = dart.JsSymbol('message');
   class StateError extends Error {
+    get message() {
+      return this[message$2];
+    }
     StateError(message) {
-      this.message = message;
+      this[message$2] = message;
       super.Error();
     }
     toString() {
       return `Bad state: ${this.message}`;
     }
   }
+  let modifiedObject$ = dart.JsSymbol('modifiedObject');
   class ConcurrentModificationError extends Error {
+    get modifiedObject() {
+      return this[modifiedObject$];
+    }
     ConcurrentModificationError(modifiedObject) {
       if (modifiedObject === void 0)
         modifiedObject = null;
-      this.modifiedObject = modifiedObject;
+      this[modifiedObject$] = modifiedObject;
       super.Error();
     }
     toString() {
@@ -893,11 +957,15 @@ var core;
     }
   }
   StackOverflowError[dart.implements] = () => [Error];
+  let variableName$ = dart.JsSymbol('variableName');
   class CyclicInitializationError extends Error {
+    get variableName() {
+      return this[variableName$];
+    }
     CyclicInitializationError(variableName) {
       if (variableName === void 0)
         variableName = null;
-      this.variableName = variableName;
+      this[variableName$] = variableName;
       super.Error();
     }
     toString() {
@@ -924,7 +992,19 @@ var core;
     }
   }
   _ExceptionImplementation[dart.implements] = () => [Exception];
+  let message$3 = dart.JsSymbol('message');
+  let source$ = dart.JsSymbol('source');
+  let offset$ = dart.JsSymbol('offset');
   class FormatException extends Object {
+    get message() {
+      return this[message$3];
+    }
+    get source() {
+      return this[source$];
+    }
+    get offset() {
+      return this[offset$];
+    }
     FormatException(message, source, offset) {
       if (message === void 0)
         message = "";
@@ -932,9 +1012,9 @@ var core;
         source = null;
       if (offset === void 0)
         offset = -1;
-      this.message = message;
-      this.source = source;
-      this.offset = offset;
+      this[message$3] = message;
+      this[source$] = source;
+      this[offset$] = offset;
     }
     toString() {
       let report = "FormatException";
@@ -1021,16 +1101,20 @@ var core;
     }
   }
   IntegerDivisionByZeroException[dart.implements] = () => [Exception];
+  let name$2 = dart.JsSymbol('name');
   let _EXPANDO_PROPERTY_NAME = dart.JsSymbol('_EXPANDO_PROPERTY_NAME');
   let _getKey = dart.JsSymbol('_getKey');
   let _KEY_PROPERTY_NAME = dart.JsSymbol('_KEY_PROPERTY_NAME');
   let _keyCount = dart.JsSymbol('_keyCount');
   let Expando$ = dart.generic(function(T) {
     class Expando extends Object {
+      get name() {
+        return this[name$2];
+      }
       Expando(name) {
         if (name === void 0)
           name = null;
-        this.name = name;
+        this[name$2] = name;
       }
       toString() {
         return `Expando:${this.name}`;
@@ -1129,10 +1213,10 @@ var core;
     return _Generator;
   });
   let _Generator = _Generator$();
+  let _id = dart.JsSymbol('_id');
   let _end = dart.JsSymbol('_end');
   let _start = dart.JsSymbol('_start');
   let _generator = dart.JsSymbol('_generator');
-  let _id = dart.JsSymbol('_id');
   let $iterator = dart.JsSymbol('$iterator');
   let $skip = dart.JsSymbol('$skip');
   let $take = dart.JsSymbol('$take');
@@ -1473,12 +1557,16 @@ var core;
   dart.defineNamedConstructor(String, 'fromCharCodes');
   dart.defineNamedConstructor(String, 'fromCharCode');
   dart.defineNamedConstructor(String, 'fromEnvironment');
+  let string$ = dart.JsSymbol('string');
   let $last = dart.JsSymbol('$last');
   dart.defineLazyClass(exports, {
     get Runes() {
       class Runes extends collection.IterableBase$(int) {
+        get string() {
+          return this[string$];
+        }
         Runes(string) {
-          this.string = string;
+          this[string$] = string;
           super.IterableBase();
         }
         get [exports.$iterator]() {
@@ -1514,19 +1602,23 @@ var core;
   function _combineSurrogatePair(start, end) {
     return 65536 + ((dart.notNull(start) & 1023) << 10) + (dart.notNull(end) & 1023);
   }
+  let string$0 = dart.JsSymbol('string');
   let _position = dart.JsSymbol('_position');
   let _nextPosition = dart.JsSymbol('_nextPosition');
   let _currentCodePoint = dart.JsSymbol('_currentCodePoint');
   let _checkSplitSurrogate = dart.JsSymbol('_checkSplitSurrogate');
   class RuneIterator extends Object {
+    get string() {
+      return this[string$0];
+    }
     RuneIterator(string) {
-      this.string = string;
+      this[string$0] = string;
       this[_position] = 0;
       this[_nextPosition] = 0;
       this[_currentCodePoint] = null;
     }
     at(string, index) {
-      this.string = string;
+      this[string$0] = string;
       this[_position] = index;
       this[_nextPosition] = index;
       this[_currentCodePoint] = null;
@@ -1675,6 +1767,7 @@ var core;
     }
   }
   class Type extends Object {}
+  let scheme$ = dart.JsSymbol('scheme');
   let _writeAuthority = dart.JsSymbol('_writeAuthority');
   let _userInfo = dart.JsSymbol('_userInfo');
   let _host = dart.JsSymbol('_host');
@@ -1709,6 +1802,7 @@ var core;
   let _makeWindowsFileUrl = dart.JsSymbol('_makeWindowsFileUrl');
   let _makeFileUri = dart.JsSymbol('_makeFileUri');
   let _checkNonWindowsPathReservedCharacters = dart.JsSymbol('_checkNonWindowsPathReservedCharacters');
+  let $forEach = dart.JsSymbol('$forEach');
   let _checkWindowsPathReservedCharacters = dart.JsSymbol('_checkWindowsPathReservedCharacters');
   let _checkWindowsDriveLetter = dart.JsSymbol('_checkWindowsDriveLetter');
   let _UPPER_CASE_A = dart.JsSymbol('_UPPER_CASE_A');
@@ -1716,6 +1810,8 @@ var core;
   let _LOWER_CASE_A = dart.JsSymbol('_LOWER_CASE_A');
   let _LOWER_CASE_Z = dart.JsSymbol('_LOWER_CASE_Z');
   let _BACKSLASH = dart.JsSymbol('_BACKSLASH');
+  let $map = dart.JsSymbol('$map');
+  let $toList = dart.JsSymbol('$toList');
   let _normalizeRegName = dart.JsSymbol('_normalizeRegName');
   let _isRegNameChar = dart.JsSymbol('_isRegNameChar');
   let _PERCENT = dart.JsSymbol('_PERCENT');
@@ -1741,6 +1837,8 @@ var core;
   let _DOT = dart.JsSymbol('_DOT');
   let _hasDotSegments = dart.JsSymbol('_hasDotSegments');
   let _removeDotSegments = dart.JsSymbol('_removeDotSegments');
+  let $isEmpty = dart.JsSymbol('$isEmpty');
+  let $removeLast = dart.JsSymbol('$removeLast');
   let _toWindowsFilePath = dart.JsSymbol('_toWindowsFilePath');
   let _toFilePath = dart.JsSymbol('_toFilePath');
   let _isPathAbsolute = dart.JsSymbol('_isPathAbsolute');
@@ -1748,16 +1846,14 @@ var core;
   let _unreserved2396Table = dart.JsSymbol('_unreserved2396Table');
   let _uriDecode = dart.JsSymbol('_uriDecode');
   let _encodeFullTable = dart.JsSymbol('_encodeFullTable');
+  let $fold = dart.JsSymbol('$fold');
   let _SPACE = dart.JsSymbol('_SPACE');
   let _PLUS = dart.JsSymbol('_PLUS');
   let _hexCharPairToByte = dart.JsSymbol('_hexCharPairToByte');
-  let $forEach = dart.JsSymbol('$forEach');
-  let $map = dart.JsSymbol('$map');
-  let $toList = dart.JsSymbol('$toList');
-  let $isEmpty = dart.JsSymbol('$isEmpty');
-  let $removeLast = dart.JsSymbol('$removeLast');
-  let $fold = dart.JsSymbol('$fold');
   class Uri extends Object {
+    get scheme() {
+      return this[scheme$];
+    }
     get authority() {
       if (!dart.notNull(this.hasAuthority))
         return "";
@@ -1965,7 +2061,7 @@ var core;
       throw new FormatException(message, uri, index);
     }
     [_internal](scheme, userInfo, host, port, path, query, fragment) {
-      this.scheme = scheme;
+      this[scheme$] = scheme;
       this[_userInfo] = userInfo;
       this[_host] = host;
       this[_port] = port;