Compute the correct signature for default constructors.

dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart

Index: dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart b/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
index 6c8bdd14cffd97bbe5adc11e92dac55f53b77da0..62d5f14c447b3fd180890def7b2becb8c9615656 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
@@ -1398,17 +1398,19 @@ class ConstructorBodyElementX extends FunctionElementX
  */
 class SynthesizedConstructorElementX extends FunctionElementX {
   final FunctionElement superMember;
+  final bool isDefaultConstructor;
 
   SynthesizedConstructorElementX(SourceString name,
                                  this.superMember,
-                                 Element enclosing)
+                                 Element enclosing,
+                                 this.isDefaultConstructor)

[ngeoffray, 2013/08/08 21:55:24]

Did you consider a named parameter?

       : super(name,
               ElementKind.GENERATIVE_CONSTRUCTOR,
               Modifiers.EMPTY,
               enclosing);
 
   SynthesizedConstructorElementX.forDefault(superMember, Element enclosing)
-      : this(const SourceString(''), superMember, enclosing);
+      : this(const SourceString(''), superMember, enclosing, true);
 
   Token position() => enclosingElement.position();
 
@@ -1417,6 +1419,11 @@ class SynthesizedConstructorElementX extends FunctionElementX {
   FunctionElement get targetConstructor => superMember;
 
   FunctionSignature computeSignature(compiler) {
+    if (isDefaultConstructor) {
+      return new FunctionSignatureX(
+          const Link<Element>(), const Link<Element>(), 0, 0, false,
+          getEnclosingClass().thisType);
+    }
     if (superMember.isErroneous()) {
       return compiler.objectClass.localLookup(
           const SourceString('')).computeSignature(compiler);