#7461: Error messages about "do" statements contain false information -------------------------------------+------------------------------------- Reporter: EyalLotem | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.0.2 Component: Compiler (Type | Version: 7.6.1 checker) | Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => fixed * milestone: => 8.0.2 Comment: GHC 8.0 produces, {{{ hi.hs:2:3: error: • Couldn't match expected type ‘Char’ with actual type ‘IO Char’ • In a stmt of a 'do' block: getLine In the second argument of ‘($)’, namely ‘do { getLine; return 'x' }’ In the expression: putChar $ do { getLine; return 'x' } }}} Which seems quite reasonable. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7461#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler