Issue 962. Fix for crash in nested function parameters list code generation.

compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java

Index: compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
diff --git a/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java b/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
index 6dca0115f3f2450d7fb23da990345b60d1a16843..157fad9a96e70feda4abd291fb4cd7739cdd6762 100644
--- a/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
+++ b/compiler/javatests/com/google/dart/compiler/backend/js/SnippetTestCase.java
@@ -40,15 +40,19 @@ public abstract class SnippetTestCase extends CompilerTestCase {
     super.tearDown();
   }
 
-  protected String compileSingleUnit(final String filePath) throws IOException {
+  protected String compileSingleUnit(String filePath) throws IOException {
     return compileSingleUnit(filePath, "Main");
   }
 
-  protected String compileSingleUnit(final String filePath, final String part) throws IOException {
+  protected String compileSingleUnit(String filePath, String part) throws IOException {
     URL url = inputUrlFor(getClass(), filePath + ".dart");
     String source = readUrl(url);
+    return compileSingleUnitSource(source, part);
+  }
+
+  protected String compileSingleUnitSource(String source, String part) throws IOException {
     MockLibrarySource lib = new MockLibrarySource();
-    DartSourceTest src = new DartSourceTest(filePath, source, lib);
+    DartSourceTest src = new DartSourceTest("test", source, lib);
     lib.addSource(src);
     CompilerOptions options = new CompilerOptions();
     CompilerConfiguration config = new DefaultCompilerConfiguration(this.getBackend(), options);