Change assert implementation to not depend on a top-level function called 'assert'.

lib/compiler/implementation/universe.dart

 // 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.
 
 class Universe {
   Map<Element, CodeBuffer> generatedCode;
   Map<Element, CodeBuffer> generatedBailoutCode;
   final Set<ClassElement> instantiatedClasses;
   final Set<FunctionElement> staticFunctionsNeedingGetter;
   final Map<SourceString, Set<Selector>> invokedNames;
@@ skipping 153 matching lines @@
   bool isSetter() => kind === SelectorKind.SETTER;
   bool isCall() => kind === SelectorKind.CALL;
 
   bool isIndex() => kind === SelectorKind.INDEX && argumentCount == 1;
   bool isIndexSet() => kind === SelectorKind.INDEX && argumentCount == 2;
 
   bool isOperator() => kind === SelectorKind.OPERATOR;
   bool isUnaryOperator() => isOperator() && argumentCount == 0;
   bool isBinaryOperator() => isOperator() && argumentCount == 1;
 
+  /** Check whether this is a call to 'assert' with one positional parameter. */
+  bool isAssertSyntax() {
+    return (isCall() &&
+            name.stringValue === "assert" &&
+            argumentCount == 1 &&
+            namedArgumentCount == 0);
+  }
+
   int hashCode() => argumentCount + 1000 * namedArguments.length;
   int get namedArgumentCount => namedArguments.length;
   int get positionalArgumentCount => argumentCount - namedArgumentCount;
   DartType get receiverType => null;
 
   bool applies(Element element, Compiler compiler)
       => appliesUntyped(element, compiler);
 
   bool appliesUntyped(Element element, Compiler compiler) {
     if (element.isSetter()) return isSetter();
@@ skipping 222 matching lines @@
 
     if (!self.isInterface() && self.isSubclassOf(other)) {
       // Resolve an invocation of [element.name] on [self]. If it
       // is found, this selector is a candidate.
       return hasElementIn(self, element) && appliesUntyped(element, compiler);
     }
 
     return false;
   }
 }