Rebased and retested version of CL 1915123008.

pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart

Index: pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
diff --git a/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart b/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
index 81eae70c8192c51db1bac54801b317ce8eb2c33e..03f0ba1f9735b059d0a33c903c13d3294e543501 100644
--- a/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
+++ b/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
@@ -495,6 +495,8 @@ class TreePrinter {
           : makeFunctionBody(exp.body);
       result = new tree.FunctionExpression(
           constructorName(exp),
+          // TODO(eernst): retrieve and pass the actual type variables.
+          null, // typeVariables
           parameters,
           body,
           null, // return type
@@ -514,6 +516,8 @@ class TreePrinter {
       tree.Node body = makeFunctionBody(exp.body);
       result = new tree.FunctionExpression(
           functionName(exp),
+          // TODO(eernst): retrieve and pass the actual type variables.
+          null, // typeVariables
           parameters,
           body,
           exp.returnType == null || exp.element.isConstructor
@@ -798,6 +802,8 @@ class TreePrinter {
     } else if (stmt is FunctionDeclaration) {
       tree.FunctionExpression function = new tree.FunctionExpression(
           stmt.name != null ? makeIdentifier(stmt.name) : null,
+          // TODO(eernst): retrieve and pass the actual type variables.
+          null, // typeVariables
           makeParameters(stmt.parameters),
           makeFunctionBody(stmt.body),
           stmt.returnType != null ? makeType(stmt.returnType) : null,
@@ -965,6 +971,8 @@ class TreePrinter {
     if (param.isFunction) {
       tree.Node definition = new tree.FunctionExpression(
           makeIdentifier(param.name),
+          // TODO(eernst): retrieve and pass the actual type variables.
+          null, // typeVariables
           makeParameters(param.parameters),
           null, // body
               param.type == null ? null : makeType(param.type),