Try retyping the line from scratch. It's possible that a linefeed character slipped in somehow without a carriage return (or vice versa) and your editor isn't showing it. I had this happen to me once in HotDog Pro, for example.
Well, I typed the line again -- the same way -- and everything worked like a charm... I really, really dislike those kinds of errors, especially since I spend 5+ hours pulling my hair out when re-writing a TCP test program for a Xkernel project. Turned out my mysterious error was a tab that had been deleted, but left behind an invisible character.
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