Set FunctionTypeImpl for synthetic VariableElement.initializer elements.

pkg/analyzer/lib/src/dart/element/builder.dart

Index: pkg/analyzer/lib/src/dart/element/builder.dart
diff --git a/pkg/analyzer/lib/src/dart/element/builder.dart b/pkg/analyzer/lib/src/dart/element/builder.dart
index 594fdf18cf0640bef2e3c2b776fef54878bd1704..17133454c89017c426163beebcdbccabbed15214 100644
--- a/pkg/analyzer/lib/src/dart/element/builder.dart
+++ b/pkg/analyzer/lib/src/dart/element/builder.dart
@@ -562,6 +562,7 @@ class ElementBuilder extends RecursiveAstVisitor<Object> {
       initializer.localVariables = holder.localVariables;
       initializer.parameters = holder.parameters;
       initializer.synthetic = true;
+      initializer.type = new FunctionTypeImpl(initializer);
       parameter.initializer = initializer;
       parameter.defaultValueCode = defaultValue.toSource();
     }
@@ -1161,6 +1162,7 @@ class ElementBuilder extends RecursiveAstVisitor<Object> {
       initializer.labels = holder.labels;
       initializer.localVariables = holder.localVariables;
       initializer.synthetic = true;
+      initializer.type = new FunctionTypeImpl(initializer);
       element.initializer = initializer;
       holder.validate();
     }