Issue 5621. Fix for infinite cycle during incomplete switch parsing

compiler/java/com/google/dart/compiler/parser/DartParser.java

Index: compiler/java/com/google/dart/compiler/parser/DartParser.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartParser.java b/compiler/java/com/google/dart/compiler/parser/DartParser.java
index d427b43d06405f052cd92e2d48345b3f3cd0d245..adde09b6321bef279ed323f34d68ae3e42fee0b2 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartParser.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartParser.java
@@ -4857,6 +4857,9 @@ public class DartParser extends CompletionHooksParserBase {
     expectCloseParen();
 
     List<DartSwitchMember> members = new ArrayList<DartSwitchMember>();
+    if (peek(0) != Token.LBRACE) {

[Brian Wilkerson, 2012/10/17 18:26:04]

Shouldn't this generate an error message to indicate that a block was expected?
Otherwise it looks like this will accept the following without error:

  switch (e)
  if (c) { ... }

(I checked, and it does accept it.)

+      return done(new DartSwitchStatement(expr, members));
+    }
     boolean foundOpenBrace = expect(Token.LBRACE);
 
     boolean done = optional(Token.RBRACE);