Check in codegen test expectations.

test/codegen/expect/language/compile_time_constant12_test.js

+dart_library.library('language/compile_time_constant12_test', null, /* Imports */[
+  'dart_sdk'
+], function load__compile_time_constant12_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const compile_time_constant12_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  compile_time_constant12_test.s = "foo";
+  compile_time_constant12_test.i = compile_time_constant12_test.s[dartx.length];
+  compile_time_constant12_test.l = dart.notNull("foo"[dartx.length]) + 1;
+  compile_time_constant12_test.use = function(x) {
+    return x;
+  };
+  dart.fn(compile_time_constant12_test.use, dynamicTodynamic());
+  compile_time_constant12_test.main = function() {
+    compile_time_constant12_test.use(compile_time_constant12_test.s);
+    compile_time_constant12_test.use(compile_time_constant12_test.i);
+    compile_time_constant12_test.use(compile_time_constant12_test.l);
+  };
+  dart.fn(compile_time_constant12_test.main, VoidTodynamic());
+  // Exports:
+  exports.compile_time_constant12_test = compile_time_constant12_test;
+});