#13388: Caret diagnostics interact badly with hsc2hs -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Rufflewind): Hm, it seems hsc2hs does not propagate column numbers from the original source file. One could add spaces as necessary to push tokens to the correct location: {{{ lONG_CONSTANT_NAME = 42 :: Int32 }}} If the replaced token is longer then it could be worked around as: {{{ lONG_CONSTANT_NAME = someVeryVeryVeryVeryVeryLongConstant {-# LINE 5 "Bug.hsc" #-} :: Int32 }}} But this might be risky because Haskell is indentation sensitive, so perhaps the simpler approach is to teach GHC a more precise `LINE` pragma: {{{ {-# LINE 5 "Bug.hsc" 57 49 #-} lONG_CONSTANT_NAME = someVeryVeryVeryVeryVeryLongConstant :: Int32 }}} The syntax of this new pragma could be something like: {{{ {-# LINE <line> <name> <oldCol1> <newCol1> <oldCol2> <newCol2> ... #-} }}} This can be used to adjust column numbers. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13388#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler