Source in most stuff.

dart/frog/leg/elements/elements.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.
 
 #library('elements');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
 #import('../leg.dart');  // TODO(karlklose): we only need type.
 #import('../util/util.dart');
@@ skipping 309 matching lines @@
   if (identifier === null) {
     compiler.cancel('library prefixes not handled',
                     node: typeAnnotation.typeName);
   }
   final SourceString name = identifier.source;
   Element element = library.find(name);
   if (element !== null && element.kind === ElementKind.CLASS) {
     // TODO(karlklose): substitute type parameters.
     return element.computeType(compiler);
   }
-  return compiler.types.lookup(name);
+  Type type = compiler.types.lookup(name);
+  if (type === null) {
+    type = compiler.types.dynamicType;
+  }
+  return type;
 }
 
 class FunctionParameters {
   Link<Element> requiredParameters;
   Link<Element> optionalParameters;
   int requiredParameterCount;
   int optionalParameterCount;
   FunctionParameters(this.requiredParameters,
                      this.optionalParameters,
                      this.requiredParameterCount,
@@ skipping 374 matching lines @@
   bool isContinueTarget = false;
 
   StatementElement(this.origin, Element enclosingElement)
       : super(const SourceString(""), ElementKind.STATEMENT, enclosingElement);
   StatementElement.label(String name, this.origin, Element enclosingElement)
       : super(new SourceString(name), ElementKind.STATEMENT, enclosingElement);
   bool get isTarget() => isBreakTarget || isContinueTarget;
 
   Node parseNode(DiagnosticListener l) => origin;
 }