Deprecate the use of `Function` as a class.

pkg/analyzer/lib/src/dart/error/hint_codes.dart

Index: pkg/analyzer/lib/src/dart/error/hint_codes.dart
diff --git a/pkg/analyzer/lib/src/dart/error/hint_codes.dart b/pkg/analyzer/lib/src/dart/error/hint_codes.dart
index a81585b3bc2a7d2b0be427e78eb5712e9785a377..aa0f91a8a279d33d1608ce3ef36deed44f3118b0 100644
--- a/pkg/analyzer/lib/src/dart/error/hint_codes.dart
+++ b/pkg/analyzer/lib/src/dart/error/hint_codes.dart
@@ -95,6 +95,38 @@ class HintCode extends ErrorCode {
       "Try replacing the use of the deprecated member with the replacement.");
 
   /**
+   * Users should not create a class named `Function` anymore.
+   */
+  static const HintCode DEPRECATED_FUNCTION_CLASS_DECLARATION = const HintCode(
+      'DEPRECATED_FUNCTION_CLASS_DECLARATION',
+      "Declaring a class named 'Function' is deprecated.",
+      "Try renaming the class.");
+
+  /**
+   * `Function` should not be extended anymore.
+   */
+  static const HintCode DEPRECATED_EXTENDS_FUNCTION = const HintCode(
+      'DEPRECATED_EXTENDS_FUNCTION',
+      "Extending 'Function' is deprecated.",
+      "Try removing 'Function' from the 'extends' clause.");
+
+  /**
+   * `Function` should not be implemented anymore.
+   */
+  static const HintCode DEPRECATED_IMPLEMENTS_FUNCTION = const HintCode(
+      'DEPRECATED_IMPLEMENTS_FUNCTION',
+      "Implementing 'Function' is deprecated.",
+      "Try removing 'Function' from the 'implements' clause.");
+
+  /**
+   * `Function` should not be mixed in anymore.
+   */
+  static const HintCode DEPRECATED_MIXIN_FUNCTION = const HintCode(
+      'DEPRECATED_MIXIN_FUNCTION',
+      "Mixing in 'Function' is deprecated.",
+      "Try removing 'Function' from the 'with' clause.");
+
+  /**
    * Hint to use the ~/ operator.
    */
   static const HintCode DIVISION_OPTIMIZATION = const HintCode(