Use a symbol for static length/name (conflicts with Function properties in ES5: cannot redefine Fun…

test/codegen/expect/closure.js

Index: test/codegen/expect/closure.js
diff --git a/test/codegen/expect/closure.js b/test/codegen/expect/closure.js
index b33e351fec2f42119f7e7e2b68a55de6ff99028f..c347f8928790f541df3f4234485b6b1cabc1da08 100644
--- a/test/codegen/expect/closure.js
+++ b/test/codegen/expect/closure.js
@@ -67,6 +67,21 @@ dart_library.library('closure', null, /* Imports */[
         let b = opts && 'b' in opts ? opts.b : null;
         let c = opts && 'c' in opts ? opts.c : null;
       }
+      static [dartx.name]() {
+        return 'Foo.name()';
+      }
+      static [dartx.length]() {
+        return 'Foo.length()';
+      }
+      static [dartx.arguments]() {
+        return 'Foo.arguments()';
+      }
+      static [dartx.caller]() {
+        return 'Foo.caller()';
+      }
+      static [dartx.callee]() {
+        return 'Foo.callee()';
+      }
       nullary_method() {}
       /**
        * @param {function(?, ?=):?number} f
@@ -104,8 +119,15 @@ dart_library.library('closure', null, /* Imports */[
         nullary_method: [dart.dynamic, []],
         function_params: [dart.dynamic, [dart.functionType(core.int, [dart.dynamic], [dart.dynamic]), dart.functionType(dart.dynamic, [dart.dynamic], {y: core.String, z: dart.dynamic}), Callback]]
       }),
-      statics: () => ({named_params: [dart.dynamic, [dart.dynamic], {b: dart.dynamic, c: dart.dynamic}]}),
-      names: ['named_params']
+      statics: () => ({
+        named_params: [dart.dynamic, [dart.dynamic], {b: dart.dynamic, c: dart.dynamic}],
+        [dartx.name]: [dart.dynamic, []],
+        [dartx.length]: [dart.dynamic, []],
+        [dartx.arguments]: [dart.dynamic, []],
+        [dartx.caller]: [dart.dynamic, []],
+        [dartx.callee]: [dart.dynamic, []]
+      }),
+      names: ['named_params', dartx.name, dartx.length, dartx.arguments, dartx.caller, dartx.callee]
     });
     /** @final {string} */
     Foo.some_static_constant = "abc";
@@ -128,6 +150,11 @@ dart_library.library('closure', null, /* Imports */[
   });
   /** @param {?} args */
   function main(args) {
+    core.print(Foo[dartx.name]());
+    core.print(Foo[dartx.length]());
+    core.print(Foo[dartx.arguments]());
+    core.print(Foo[dartx.caller]());
+    core.print(Foo[dartx.callee]());
   }
   dart.fn(main, dart.void, [dart.dynamic]);
   /** @final {string} */
@@ -136,6 +163,13 @@ dart_library.library('closure', null, /* Imports */[
   exports.some_top_level_final = "abc";
   /** @type {string} */
   exports.some_top_level_var = "abc";
+  dart.defineExtensionNames([
+    "name",
+    "length",
+    "arguments",
+    "caller",
+    "callee"
+  ]);
   // Exports:
   exports.Callback = Callback;
   exports.Foo$ = Foo$;