isGoodSrcSpan _ = False
isOneLineSpan :: SrcSpan -> Bool
--- ^ True if the span is known to straddle more than one line.
+-- ^ True if the span is known to straddle only one line.
-- For "bad" 'SrcSpan', it returns False
isOneLineSpan s
| isGoodSrcSpan s = srcSpanStartLine s == srcSpanEndLine s