Wrap standalone invariant() calls in assert().

pkg/compiler/lib/src/resolution/members.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.
 
 part of resolution;
 
 abstract class TreeElements {
   AnalyzableElement get analyzedElement;
   Iterable<Node> get superUses;
 
@@ skipping 2033 matching lines @@
         compiler.reportError(
             node, MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER,
             {'keyword': element.name,
              'modifier': currentAsyncMarker});
       }
     }
   }
 
   /// Register [node] as the definition of [element].
   void defineLocalVariable(Node node, LocalVariableElement element) {
-    invariant(node, element != null);
+    if (element == null) {
+      throw compiler.internalError(node, 'element is null');
+    }
     checkLocalDefinitionName(node, element);
     registry.defineElement(node, element);
   }
 
   void reportDuplicateDefinition(String name,
                                  Spannable definition,
                                  Spannable existing) {
     compiler.reportError(definition,
         MessageKind.DUPLICATE_DEFINITION, {'name': name});
     compiler.reportInfo(existing,
@@ skipping 2102 matching lines @@
  */
 class ClassResolverVisitor extends TypeDefinitionVisitor {
   BaseClassElementX get element => enclosingElement;
 
   ClassResolverVisitor(Compiler compiler,
                        ClassElement classElement,
                        ResolutionRegistry registry)
     : super(compiler, classElement, registry);
 
   DartType visitClassNode(ClassNode node) {
-    invariant(node, element != null);
-    invariant(element, element.resolutionState == STATE_STARTED,
-        message: () => 'cyclic resolution of class $element');
+    if (element == null) {
+      throw compiler.internalError(node, 'element is null');
+    }
+    if (element.resolutionState != STATE_STARTED) {
+      throw compiler.internalError(element,
+          'cyclic resolution of class $element');
+    }
 
     InterfaceType type = element.computeType(compiler);
     scope = new TypeDeclarationScope(scope, element);
     // TODO(ahe): It is not safe to call resolveTypeVariableBounds yet.
     // As a side-effect, this may get us back here trying to
     // resolve this class again.
     resolveTypeVariableBounds(node.typeParameters);
 
     // Setup the supertype for the element (if there is a cycle in the
     // class hierarchy, it has already been set to Object).
@@ skipping 64 matching lines @@
     }
     return element.computeType(compiler);
   }
 
   @override
   DartType visitEnum(Enum node) {
     if (!compiler.enableEnums) {
       compiler.reportError(node, MessageKind.EXPERIMENTAL_ENUMS);
     }
 
-    invariant(node, element != null);
-    invariant(element, element.resolutionState == STATE_STARTED,
-        message: () => 'cyclic resolution of class $element');
+    if (element == null) {
+      throw compiler.internalError(node, 'element is null');
+    }
+    if (element.resolutionState != STATE_STARTED) {
+      throw compiler.internalError(element,
+          'cyclic resolution of class $element');
+    }
 
     InterfaceType enumType = element.computeType(compiler);
     element.supertype = compiler.objectClass.computeType(compiler);
     element.interfaces = const Link<DartType>();
     calculateAllSupertypes(element);
 
     if (node.names.nodes.isEmpty) {
       compiler.reportError(node,
                            MessageKind.EMPTY_ENUM_DECLARATION,
                            {'enumName': element.name});
@@ skipping 17 matching lines @@
       compiler.reportError(mixinNode, MessageKind.CANNOT_MIXIN_MALFORMED,
           {'className': element.name, 'malformedType': mixinType});
     } else if (mixinType.isEnumType) {
       compiler.reportError(mixinNode, MessageKind.CANNOT_MIXIN_ENUM,
           {'className': element.name, 'enumType': mixinType});
     }
     return mixinType;
   }
 
   DartType visitNamedMixinApplication(NamedMixinApplication node) {
-    invariant(node, element != null);
-    invariant(element, element.resolutionState == STATE_STARTED,
-        message: () => 'cyclic resolution of class $element');
+    if (element == null) {
+      throw compiler.internalError(node, 'element is null');
+    }
+    if (element.resolutionState != STATE_STARTED) {
+      throw compiler.internalError(element,
+          'cyclic resolution of class $element');
+    }
 
     if (identical(node.classKeyword.stringValue, 'typedef')) {
       // TODO(aprelev@gmail.com): Remove this deprecation diagnostic
       // together with corresponding TODO in parser.dart.
       compiler.reportWarning(node.classKeyword,
           MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX);
     }
 
     InterfaceType type = element.computeType(compiler);
     scope = new TypeDeclarationScope(scope, element);
@@ skipping 698 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }