Check in codegen test expectations.

test/codegen/expect/language/bad_raw_string_negative_test.js

+dart_library.library('language/bad_raw_string_negative_test', null, /* Imports */[
+  'dart_sdk'
+], function load__bad_raw_string_negative_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const bad_raw_string_negative_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  bad_raw_string_negative_test.main = function() {
+    core.print('\n');
+  };
+  dart.fn(bad_raw_string_negative_test.main, VoidTodynamic());
+  // Exports:
+  exports.bad_raw_string_negative_test = bad_raw_string_negative_test;
+});