Expect '{' during class parsing, report error if not.

compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java

Index: compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
diff --git a/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java b/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
index 2af6784d1e870e65b67f17d7beb893e2d2ed4912..24d0cb132ca10952ed6e5e757c93056751308a73 100644
--- a/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
+++ b/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
@@ -5,6 +5,9 @@
 package com.google.dart.compiler.parser;
 
 import com.google.dart.compiler.CompilerTestCase;
+import com.google.dart.compiler.DartCompilerErrorCode;
+import com.google.dart.compiler.ast.DartUnit;
+import com.google.dart.compiler.ast.DartVisitor;
 
 /**
  * Negative Parser/Syntax tests.
@@ -42,4 +45,34 @@ public class NegativeParserTest extends CompilerTestCase {
   public void testMultipleRedirectionConstructors() {
     parseExpectErrors("class A { A(x) { } A.foo(this.y) : this(1), this(2); }", 1);
   }
+
+  public void testIncompleteClassDeclaration_noLBrace() {
+    String sourceCode =
+        makeCode(
+            "// filler filler filler filler filler",

[zundel, 2011/10/24 19:32:04]

I don't think we need this line.

+            "class Baz",
+            "class Foo<T> implements Bar<T> {",
+            "  Foo(T head, Bar<T> tail);",
+            "}");
+    DartUnit unit =
+        parseSourceUnitErrors(
+            sourceCode,
+            DartCompilerErrorCode.EXPECTED_CLASS_DECLARATION_LBRACE.getMessage(), 3, 1);
+    // there was NPE during this operation

[zundel, 2011/10/24 19:32:04]

The NPE is fixed now, let's remove the comment

+    new DartVisitor().accept(unit);
+    // check structure of AST, top level Baz and Foo expected
+    assertEquals(2, unit.getTopLevelNodes().size());
+    assertEquals(
+        makeCode(
+            "// unit Test.dart",
+            "class Baz {",
+            "}",
+            "",
+            "class Foo<T> implements Bar<T> {",
+            "",
+            "  Foo(T head, Bar<T> tail) ;",
+            "}",
+            ""),
+        unit.toSource());
+  }
 }