Handle symbol literals

lib/runtime/dart/_js_helper.js

 var _js_helper;
 (function(exports) {
   'use strict';
   class NoSideEffects extends core.Object {
     NoSideEffects() {
     }
   }
   class NoThrows extends core.Object {
     NoThrows() {
     }
@@ skipping 2022 matching lines @@
       let names = '';
       if (dart.notNull(namedArguments != null) && !dart.notNull(namedArguments.isEmpty)) {
         namedArguments.forEach((name, argument) => {
           names = `${names}$${name}`;
           namedArgumentList[core.$add](name);
           arguments$[core.$add](argument);
           argumentCount = dart.notNull(argumentCount) + 1;
         });
       }
       let selectorName = `${_foreign_helper.JS_GET_NAME("CALL_PREFIX")}$${argumentCount}${names}`;
-      return dart.dsend(func, 'noSuchMethod', createUnmangledInvocationMirror(dart.throw_("Unimplemented SymbolLiteral: #call"), selectorName, JSInvocationMirror.METHOD, arguments$, namedArgumentList));
+      return dart.dsend(func, 'noSuchMethod', createUnmangledInvocationMirror(/* Unimplemented const */new _internal.Symbol("call"), selectorName, JSInvocationMirror.METHOD, arguments$, namedArgumentList));
     }
     static applyFunction(func, positionalArguments, namedArguments) {
       return namedArguments == null ? Primitives.applyFunctionWithPositionalArguments(func, positionalArguments) : Primitives.applyFunctionWithNamedArguments(func, positionalArguments, namedArguments);
     }
     static applyFunctionWithPositionalArguments(func, positionalArguments) {
       let argumentCount = 0;
       let arguments$ = null;
       if (positionalArguments != null) {
         if (positionalArguments instanceof Array) {
           arguments$ = positionalArguments;
@@ skipping 1990 matching lines @@
   exports.jsonEncodeNative = jsonEncodeNative;
   exports.getIsolateAffinityTag = getIsolateAffinityTag;
   exports.LoadLibraryFunctionType = LoadLibraryFunctionType;
   exports.DeferredLoadCallback = DeferredLoadCallback;
   exports.loadDeferredLibrary = loadDeferredLibrary;
   exports.MainError = MainError;
   exports.missingMain = missingMain;
   exports.badMain = badMain;
   exports.mainHasTooManyParameters = mainHasTooManyParameters;
 })(_js_helper || (_js_helper = {}));