Check in codegen test expectations.

test/codegen/expect/language/string_interpolation_newline_test.js

Index: test/codegen/expect/language/string_interpolation_newline_test.js
diff --git a/test/codegen/expect/language/string_interpolation_newline_test.js b/test/codegen/expect/language/string_interpolation_newline_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..c76bd7808b49cbefed4130da99905a8300b15b91
--- /dev/null
+++ b/test/codegen/expect/language/string_interpolation_newline_test.js
@@ -0,0 +1,25 @@
+dart_library.library('language/string_interpolation_newline_test', null, /* Imports */[
+  'dart_sdk'
+], function load__string_interpolation_newline_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const string_interpolation_newline_test = Object.create(null);
+  let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  string_interpolation_newline_test.main = function() {
+    let expected = '[[{{}: {}}]]';
+    let a = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()})}`])}`])}`;
+    let b = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()})}`])}`])}`;
+    let c = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()})}`])}`])}`;
+    if (expected != a) dart.throw(dart.str`expecteda: ${expected} != ${a}`);
+    if (a != b) dart.throw(dart.str`ab: ${a} != ${b}`);
+    if (b != c) dart.throw(dart.str`bc: ${b} != ${c}`);
+    core.print(dart.str`${a}${b}${c}`);
+  };
+  dart.fn(string_interpolation_newline_test.main, VoidTodynamic());
+  // Exports:
+  exports.string_interpolation_newline_test = string_interpolation_newline_test;
+});