Fix for interpolation codegen bug

tests/compiler/dart2js_extra/string_interpolation_dynamic_test.dart

Index: tests/compiler/dart2js_extra/string_interpolation_dynamic_test.dart
diff --git a/tests/compiler/dart2js_extra/string_interpolation_test.dart b/tests/compiler/dart2js_extra/string_interpolation_dynamic_test.dart
similarity index 88%
copy from tests/compiler/dart2js_extra/string_interpolation_test.dart
copy to tests/compiler/dart2js_extra/string_interpolation_dynamic_test.dart
index 7552214ab214c4ab3edab7137215775bb54d2f83..14ff9a5370d3908d4b13b5684a43422d2ecf3a23 100644
--- a/tests/compiler/dart2js_extra/string_interpolation_test.dart
+++ b/tests/compiler/dart2js_extra/string_interpolation_dynamic_test.dart
@@ -1,12 +1,16 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2014, 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.
 
 import "package:expect/expect.dart";
+import 'dart:math';
 
 // Test that String interpolation works in the code generated by the leg
 // compiler.
 
+bool get inscrutableFalse => new Random().nextDouble() > 2;
+
+inscrutable(x) => inscrutableFalse ? [] : x;
 
 int ifun() => 37;
 double dfun() => 2.71828;
@@ -17,7 +21,7 @@ void nfun() => null;
 
 void testEscapes() {
   // Test that escaping the '$' prevents string interpolation.
-  String x = "NOT HERE";
+  String x = inscrutable("NOT HERE");
   Expect.equals(r'a${x}', 'a\${x}');
   Expect.equals(r'a$x', 'a\$x');
   Expect.equals(r'a${x}', '''a\${x}''');
@@ -30,11 +34,11 @@ void testEscapes() {
 
 
 void testMultiLine() {
-  var a = "string";
-  var b = 42;
-  var c = 3.1415;
-  var d = false;
-  var n = null;
+  var a = inscrutable("string");
+  var b = inscrutable(42);
+  var c = inscrutable(3.1415);
+  var d = inscrutable(false);
+  var n = inscrutable(null);
 
   Expect.equals("string423.1415falsenull!", """$a$b$c$d$n!""");
   Expect.equals("string423.1415falsenull!", '''$a$b$c$d$n!''');
@@ -65,11 +69,11 @@ void testMultiLine() {
 
 
 void testSimple() {
-  var a = "string";
-  var b = 42;
-  var c = 3.1415;
-  var d = false;
-  var n = null;
+  var a = inscrutable("string");
+  var b = inscrutable(42);
+  var c = inscrutable(3.1415);
+  var d = inscrutable(false);
+  var n = inscrutable(null);
 
   // Both kinds of quotes and both kinds of $-escapes.
   Expect.equals("string423.1415falsenull!", "$a$b$c$d$n!");