Check in codegen test expectations.

test/codegen/expect/language/closure_break2_test.js

+dart_library.library('language/closure_break2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__closure_break2_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const closure_break2_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  closure_break2_test.ClosureBreak2 = class ClosureBreak2 extends core.Object {
+    new(field) {
+      this.field = field;
+    }
+  };
+  dart.setSignature(closure_break2_test.ClosureBreak2, {
+    constructors: () => ({new: dart.definiteFunctionType(closure_break2_test.ClosureBreak2, [core.int])})
+  });
+  closure_break2_test.ClosureBreak2Test = class ClosureBreak2Test extends core.Object {
+    static testMain() {
+      let o1 = new closure_break2_test.ClosureBreak2(3);
+      let newstr = "abcdefgh";
+      function foo() {
+        o1.field = dart.notNull(o1.field) + 1;
+        expect$.Expect.equals(8, newstr[dartx.length]);
+      }
+      dart.fn(foo, VoidTodynamic());
+      let loop = true;
+      L:
+        while (loop) {
+          let newstr1 = "abcd";
+          expect$.Expect.equals(4, newstr1[dartx.length]);
+          while (loop) {
+            let newint = 0;
+            expect$.Expect.equals(4, newstr1[dartx.length]);
+            break L;
+          }
+        }
+      foo();
+      expect$.Expect.equals(4, o1.field);
+    }
+  };
+  dart.setSignature(closure_break2_test.ClosureBreak2Test, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  closure_break2_test.main = function() {
+    closure_break2_test.ClosureBreak2Test.testMain();
+  };
+  dart.fn(closure_break2_test.main, VoidTodynamic());
+  // Exports:
+  exports.closure_break2_test = closure_break2_test;
+});