Use signature inheritance when method types are unchanged

lib/runtime/dart/_internal.js

 var _internal = dart.defineLibrary(_internal, {});
 var core = dart.import(core);
 var collection = dart.import(collection);
 var math = dart.lazyImport(math);
 var _interceptors = dart.lazyImport(_interceptors);
 var _js_primitives = dart.lazyImport(_js_primitives);
 (function(exports, core, collection, math, _interceptors, _js_primitives) {
   'use strict';
   class EfficientLength extends core.Object {}
   dart.setSignature(EfficientLength, {});
@@ skipping 224 matching lines @@
         for (let i = 0; dart.notNull(i) < dart.notNull(this[core.$length]); i = dart.notNull(i) + 1) {
           result.add(this[core.$elementAt](i));
         }
         return result;
       }
     }
     ListIterable[dart.implements] = () => [EfficientLength];
     dart.setSignature(ListIterable, {
       methods: () => ({
         [core.$forEach]: dart.functionType(dart.void, [dart.functionType(dart.void, [E])]),
-        [core.$contains]: dart.functionType(core.bool, [core.Object]),
         [core.$every]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$any]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$firstWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$lastWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$singleWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])]),
-        [core.$join]: dart.functionType(core.String, [], [core.String]),
         [core.$where]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$map]: dart.functionType(core.Iterable, [dart.functionType(dart.dynamic, [E])]),
         [core.$reduce]: dart.functionType(E, [dart.functionType(E, [dart.dynamic, E])]),
         [core.$fold]: dart.functionType(dart.dynamic, [dart.dynamic, dart.functionType(dart.dynamic, [dart.dynamic, E])]),
         [core.$skip]: dart.functionType(core.Iterable$(E), [core.int]),
         [core.$skipWhile]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$take]: dart.functionType(core.Iterable$(E), [core.int]),
         [core.$takeWhile]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$toList]: dart.functionType(core.List$(E), [], {rowabl: core.bool}),
         [core.$toSet]: dart.functionType(core.Set$(E), [])
@@ skipping 689 matching lines @@
       }
       [core.$toSet]() {
         return new (core.Set$(E))();
       }
     }
     EmptyIterable[dart.implements] = () => [EfficientLength];
     dart.setSignature(EmptyIterable, {
       methods: () => ({
         [core.$forEach]: dart.functionType(dart.void, [dart.functionType(dart.void, [E])]),
         [core.$elementAt]: dart.functionType(E, [core.int]),
-        [core.$contains]: dart.functionType(core.bool, [core.Object]),
         [core.$every]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$any]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$firstWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$lastWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$singleWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
-        [core.$join]: dart.functionType(core.String, [], [core.String]),
         [core.$where]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$map]: dart.functionType(core.Iterable, [dart.functionType(dart.dynamic, [E])]),
         [core.$reduce]: dart.functionType(E, [dart.functionType(E, [E, E])]),
         [core.$fold]: dart.functionType(dart.dynamic, [dart.dynamic, dart.functionType(dart.dynamic, [dart.dynamic, E])]),
         [core.$skip]: dart.functionType(core.Iterable$(E), [core.int]),
         [core.$skipWhile]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$take]: dart.functionType(core.Iterable$(E), [core.int]),
         [core.$takeWhile]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$toList]: dart.functionType(core.List$(E), [], {rowabl: core.bool}),
         [core.$toSet]: dart.functionType(core.Set$(E), [])
@@ skipping 767 matching lines @@
     dart.setSignature(ListMapView, {
       methods: () => ({
         get: dart.functionType(E, [core.Object]),
         containsValue: dart.functionType(core.bool, [core.Object]),
         containsKey: dart.functionType(core.bool, [core.Object]),
         forEach: dart.functionType(dart.void, [dart.functionType(dart.void, [core.int, E])]),
         set: dart.functionType(dart.void, [core.int, E]),
         putIfAbsent: dart.functionType(E, [core.int, dart.functionType(E, [])]),
         remove: dart.functionType(E, [core.Object]),
         clear: dart.functionType(dart.void, []),
-        addAll: dart.functionType(dart.void, [core.Map$(core.int, E)]),
-        toString: dart.functionType(core.String, [])
+        addAll: dart.functionType(dart.void, [core.Map$(core.int, E)])
       })
     });
     return ListMapView;
   });
   let ListMapView = ListMapView$();
   let ReversedListIterable$ = dart.generic(function(E) {
     class ReversedListIterable extends ListIterable$(E) {
       ReversedListIterable(source) {
         this[_source] = source;
         super.ListIterable();
@@ skipping 442 matching lines @@
       throw new core.ArgumentError(`"${name}" is not a valid (qualified) symbol name`);
     }
     static isValidSymbol(name) {
       return dart.notNull(name.isEmpty) || dart.notNull(Symbol.symbolPattern.hasMatch(name));
     }
   }
   Symbol[dart.implements] = () => [core.Symbol];
   dart.defineNamedConstructor(Symbol, 'unvalidated');
   dart.defineNamedConstructor(Symbol, 'validated');
   dart.setSignature(Symbol, {
-    methods: () => ({
-      '==': dart.functionType(core.bool, [core.Object]),
-      toString: dart.functionType(core.String, [])
-    }),
+    methods: () => ({'==': dart.functionType(core.bool, [core.Object])}),
     statics: () => ({
       getName: dart.functionType(core.String, [Symbol]),
       validatePublicSymbol: dart.functionType(core.String, [core.String]),
       isValidSymbol: dart.functionType(core.bool, [core.String])
     }),
     names: ['getName', 'validatePublicSymbol', 'isValidSymbol']
   });
   Symbol.reservedWordRE = '(?:assert|break|c(?:a(?:se|tch)|lass|on(?:st|tinue))|d(?:efault|o)|' + 'e(?:lse|num|xtends)|f(?:alse|inal(?:ly)?|or)|i[fns]|n(?:ew|ull)|' + 'ret(?:hrow|urn)|s(?:uper|witch)|t(?:h(?:is|row)|r(?:ue|y))|' + 'v(?:ar|oid)|w(?:hile|ith))';
   Symbol.publicIdentifierRE = '(?!' + `${Symbol.reservedWordRE}` + '\\b(?!\\$))[a-zA-Z$][\\w$]*';
   Symbol.identifierRE = '(?!' + `${Symbol.reservedWordRE}` + '\\b(?!\\$))[a-zA-Z$_][\\w$]*';
@@ skipping 74 matching lines @@
   exports.ReversedListIterable = ReversedListIterable;
   exports.UnmodifiableListError = UnmodifiableListError;
   exports.NonGrowableListError = NonGrowableListError;
   exports.makeListFixedLength = makeListFixedLength;
   exports.Lists = Lists;
   exports.printToConsole = printToConsole;
   exports.Sort = Sort;
   exports.Symbol = Symbol;
   exports.POWERS_OF_TEN = POWERS_OF_TEN;
 })(_internal, core, collection, math, _interceptors, _js_primitives);