The scope of a function's signature is the function's enclosing scope, not the formal parameters sc…

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ScopedVisitor.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ScopedVisitor.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ScopedVisitor.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ScopedVisitor.java
index fb4bd2b5159dec3b11c4f29232841ae0da55835f..1fc004eae72e8b993ea0f241c245fb2abf56559f 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ScopedVisitor.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ScopedVisitor.java
@@ -24,6 +24,7 @@ import com.google.dart.engine.ast.DoStatement;
 import com.google.dart.engine.ast.FieldDeclaration;
 import com.google.dart.engine.ast.ForEachStatement;
 import com.google.dart.engine.ast.ForStatement;
+import com.google.dart.engine.ast.FormalParameterList;
 import com.google.dart.engine.ast.FunctionDeclaration;
 import com.google.dart.engine.ast.FunctionDeclarationStatement;
 import com.google.dart.engine.ast.FunctionExpression;
@@ -274,6 +275,19 @@ public abstract class ScopedVisitor extends GeneralizingASTVisitor<Void> {
   }
 
   @Override
+  public Void visitFormalParameterList(FormalParameterList node) {
+    super.visitFormalParameterList(node);
+    // We finished resolving function signature, now include formal parameters scope.
+    if (nameScope instanceof FunctionScope) {
+      ((FunctionScope) nameScope).defineParameters();
+    }
+    if (nameScope instanceof FunctionTypeScope) {
+      ((FunctionTypeScope) nameScope).defineParameters();
+    }
+    return null;
+  }
+
+  @Override
   public Void visitForStatement(ForStatement node) {
     Scope outerNameScope = nameScope;
     LabelScope outerLabelScope = labelScope;