+isOneLineSpan :: SrcSpan -> Bool
+-- True if the span is known to straddle more than one line
+-- By default, it returns False
+isOneLineSpan s
+ | isGoodSrcSpan s = srcSpanStartLine s == srcSpanEndLine s
+ | otherwise = False
+
+--------------------------------------------------------
+-- Don't export these four;
+-- they panic on Imported, Unhelpful.
+-- They are for internal use only
+-- Urk! Some are needed for Lexer.x; see comment in export list
+