Mock up all remaining core library implementation classes.

dart/frog/leg/resolver.dart

Index: dart/frog/leg/resolver.dart
diff --git a/dart/frog/leg/resolver.dart b/dart/frog/leg/resolver.dart
index 1e378adb9e42588d5a4ea29c922695106edd0b5e..af36a18debfcb81f049e1c62674386bad4b2f4a3 100644
--- a/dart/frog/leg/resolver.dart
+++ b/dart/frog/leg/resolver.dart
@@ -123,14 +123,10 @@ class ResolverTask extends CompilerTask {
           && constructor.functionParameters.parameterCount === 0) {
         constructor.implementation = defaultClass.getSynthesizedConstructor();
       }
-    }
-    if (constructor === null) {
-      error(node.send, MessageKind.CANNOT_FIND_CONSTRUCTOR, [node.send]);
-      return null;
-    }
 
-    if (constructor.implementation === null) {
-      error(node, MessageKind.CANNOT_FIND_CONSTRUCTOR, [name]);
+      if (constructor.implementation === null) {
+        error(node, MessageKind.CANNOT_FIND_CONSTRUCTOR, [name]);
+      }
     }
   }
 
@@ -661,7 +657,7 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
       SourceString name = node.selector.asIdentifier().source;
       if (node.receiver === null) {
         target = lookup(node, name);
-        if (target === null && !enclosingElement.isInstanceMember()) {
+        if (target === null && !inInstanceContext) {
           error(node, MessageKind.CANNOT_RESOLVE, [name]);
         }
       } else if (node.isSuperCall) {
@@ -1234,6 +1230,12 @@ class SignatureResolver extends CommonResolverVisitor<Element> {
     return element;
   }
 
+  Element visitFunctionExpression(FunctionExpression node) {
+    // This is a function typed parameter.
+    // TODO(ahe): Resolve the function type.
+    return visit(node.name);
+  }
+
   LinkBuilder<Element> analyzeNodes(Link<Node> link) {
     LinkBuilder<Element> elements = new LinkBuilder<Element>();
     for (; !link.isEmpty(); link = link.tail) {