Allow all different string-literals in map literals.

tests/language/src/CompileTimeConstantOTest.dart

Index: tests/language/src/CompileTimeConstantOTest.dart
diff --git a/tests/language/src/CompileTimeConstantOTest.dart b/tests/language/src/CompileTimeConstantOTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..56a6da509668d13928054d8c2a4d008f4e2ee679
--- /dev/null
+++ b/tests/language/src/CompileTimeConstantOTest.dart
@@ -0,0 +1,31 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// Test compile-time constants with string-interpolation.
+
+final str = "foo";
+final m1 = const { "foo": 499 };
+final m2 = const { "$str": 499 };
+final m3 = const { "$str": 42, "foo": 499 };
+final m4 = const { "foo": 42, "$str": 499 };
+final m5 = const { "f" "o" "o": 499 };
+
+final mm1 = const { "afoo#foo": 499 };
+final mm2 = const { "a$str#$str": 499 };
+final mm3 = const { "a" "$str" "#" "foo": 499 };
+final mm4 = const { "a$str" "#$str": 499 };
+
+main() {
+  Expect.equals(1, m1.length);
+  Expect.equals(499, m1["foo"]);
+  Expect.identical(m1, m2);
+  Expect.identical(m1, m3);
+  Expect.identical(m1, m4);
+  Expect.identical(m1, m5);
+
+  Expect.equals(1, mm1.length);
+  Expect.equals(499, mm1["afoo#foo"]);
+  Expect.identical(mm1, mm2);
+  Expect.identical(mm1, mm3);
+  Expect.identical(mm1, mm4);
+}