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When the alternate layout rule is activated via a pragma, it injects tokens for { and } to make sure that the source is parsed properly. But it injects ITocurly and ITccurly, rather than their virtual counterparts ITvocurly and ITvccurly. This causes problems for ghc-exactprint, which tries to print these. Likewise, any injected ITsemi should have a zero-width SrcSpan. Test case (the existing T13087.hs) {-# LANGUAGE AlternativeLayoutRule #-} {-# LANGUAGE LambdaCase #-} isOne :: Int -> Bool isOne = \case 1 -> True _ -> False main = return () Closes #16279
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