Fix for parsing generic function types with Fasta.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

Index: pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
index 175ce815a37f718341692f394f63bfc4beff0463..36d09c63289966e435f19c643f4b2151ff5c36fa 100644
--- a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
+++ b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
@@ -593,6 +593,15 @@ class AstBuilder extends ScopeListener {
     push(new _ParameterDefaultValue(equals, value));
   }
 
+  void handleFunctionType(Token functionToken, Token semicolon) {
+    debugEvent("FunctionType");
+    FormalParameterList parameters = pop();
+    TypeParameterList typeParameters = pop();
+    TypeAnnotation returnType = pop();
+    push(ast.genericFunctionType(returnType, toAnalyzerToken(functionToken),
+        typeParameters, parameters));
+  }
+
   void handleFormalParameterWithoutValue(Token token) {
     debugEvent("FormalParameterWithoutValue");
     push(NullValue.ParameterDefaultValue);