#10884: Indentation requirements for parsing seem inconsistent -------------------------------------+------------------------------------- Reporter: Samvh | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 (Parser) | Keywords: parsing, Resolution: invalid | indentation, do-notation Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by ezyang): * status: new => closed * resolution: => invalid Comment: This is due to `NonDecreasingIndentation`, which is not per Haskell98 but useful in cases where you want to open a do-block without increasing indentation. This will parse fail: {{{ {-# LANGUAGE NoNondecreasingIndentation #-} f = let y = do Just 1 in y }}} Non-decreasing indentation doesn't work at the top level, because if you applied it there, there would be no indentation you could drop back in order to get out of a do-block. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10884#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler