Issue 5052. Analyzer should treat assert as a keyword

compiler/java/com/google/dart/compiler/resolver/Resolver.java

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 package com.google.dart.compiler.resolver;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 import com.google.dart.compiler.DartCompilationPhase;
@@ skipping 1471 matching lines @@
       return recordElement(x, element);
     }
 
     @Override
     public Element visitUnqualifiedInvocation(DartUnqualifiedInvocation x) {
       Scope scope = getContext().getScope();
       Element element = scope.findElement(scope.getLibrary(), x.getTarget().getName());
       if (element == null) {
         element = scope.findElement(scope.getLibrary(), "setter " + x.getTarget().getName());
       }
-      if (element == null && x.getTarget().getName().equals("assert")
-          && x.getArguments().size() == 1) {
-        element = scope.findElement(scope.getLibrary(), Elements.ASSERT_FUNCTION_NAME);
-      }
       ElementKind kind = ElementKind.of(element);
       if (!INVOKABLE_ELEMENTS.contains(kind)) {
         diagnoseErrorInUnqualifiedInvocation(x);
       } else {
         checkInvocationTarget(x, currentMethod, element);
       }
       if (Elements.isAbstractFieldWithoutGetter(element)) {
         String name = element.getName();
         if (isStaticContextOrInitializer()) {
           onError(x.getTarget(), ResolverErrorCode.USE_ASSIGNMENT_ON_SETTER, name);
@@ skipping 830 matching lines @@
           ClassElement currentClass = (ClassElement) constructor.getEnclosingElement();
           if (nextClass == currentClass) {
             return (ConstructorNodeElement) nextConstructorElement;
           }
         }
       }
     }
     return null;
   }
 }