Re: [GHC] #16279: Lexer: Alternate Layout Rule injects actual not virtual braces

#16279: Lexer: Alternate Layout Rule injects actual not virtual braces -------------------------------------+------------------------------------- Reporter: alanz | Owner: alanz Type: bug | Status: merge Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.6.3 (Parser) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect API | Unknown/Multiple annotation | Test Case: Blocked By: | Blocking: Related Tickets: #13807 | Differential Rev(s): Wiki Page: | https://gitlab.haskell.org/ghc/ghc/merge_requests/284 -------------------------------------+------------------------------------- Comment (by Marge Bot ): In [changeset:"c1cf2693d6efddeeeb813cd8995a1be136800d17/ghc" c1cf2693/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="c1cf2693d6efddeeeb813cd8995a1be136800d17" Lexer: Alternate Layout Rule injects actual not virtual braces 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 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16279#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler