Add support for the new function-type syntax.

pkg/compiler/lib/src/ssa/graph_builder.dart

Index: pkg/compiler/lib/src/ssa/graph_builder.dart
diff --git a/pkg/compiler/lib/src/ssa/graph_builder.dart b/pkg/compiler/lib/src/ssa/graph_builder.dart
index d659977b96d3559b9deb836a2ab7180719af0e72..49be09d13cff2af7bbe67a258987687fa72a330a 100644
--- a/pkg/compiler/lib/src/ssa/graph_builder.dart
+++ b/pkg/compiler/lib/src/ssa/graph_builder.dart
@@ -261,6 +261,14 @@ class ReifiedTypeRepresentationBuilder
   void visitTypeVariableType(TypeVariableType type, GraphBuilder builder) {
     ClassElement cls = builder.backend.helpers.RuntimeType;
     TypeMask instructionType = new TypeMask.subclass(cls, closedWorld);
+
+    // TODO(floitsch): this hack maps type variables of generic function
+    // typedefs to dynamic. For example: `typedef F = Function<T>(T)`.
+    if (type is MethodTypeVariableType) {
+      visitDynamicType(const DynamicType(), builder);
+      return;
+    }
+
     if (!builder.sourceElement.enclosingElement.isClosure &&
         builder.sourceElement.isInstanceMember) {
       HInstruction receiver = builder.localsHandler.readThis();