cleanup patch generation to preseve comments and remove @patch

test/generated_sdk/lib/core/function.dart

Index: test/generated_sdk/lib/core/function.dart
diff --git a/test/generated_sdk/lib/core/function.dart b/test/generated_sdk/lib/core/function.dart
index 43fce78e83f90d457a10d86900e359f9819a5c9b..9146397aeae04ac22b4514f36d1e2ab23d8edad0 100644
--- a/test/generated_sdk/lib/core/function.dart
+++ b/test/generated_sdk/lib/core/function.dart
@@ -11,7 +11,28 @@ part of dart.core;
  * subtype of a function type, and as such, a subtype of [Function].
  */
 abstract class Function {
-  @patch
+  /**
+   * Dynamically call [function] with the specified arguments.
+   *
+   * Acts the same as calling function with positional arguments
+   * corresponding to the elements of [positionalArguments] and
+   * named arguments corresponding to the elements of [namedArguments].
+   *
+   * This includes giving the same errors if [function] isn't callable or
+   * if it expects different parameters.
+   *
+   * Example:
+   *       Map<Symbol, dynamic> namedArguments = new Map<Symbol, dynamic>();
+   *       namedArguments[const Symbol("f")] = 4;
+   *       namedArguments[const Symbol("g")] = 5;
+   *       Function.apply(foo, [1,2,3], namedArguments);
+   *
+   * gives exactly the same result as
+   *       foo(1, 2, 3, f: 4, g: 5).
+   *
+   * If [positionalArguments] is null, it's considered an empty list.
+   * If [namedArguments] is omitted or null, it is considered an empty map.
+   */
   static apply(Function function,
                List positionalArguments,
                [Map<Symbol, dynamic> namedArguments]) {