#3193: line number for GADT type error is very inaccurate
-------------------+--------------------------------------------------------
Reporter: nr | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.11 | Severity: normal
Keywords: GADTs | Testcase:
Os: Linux | Architecture: x86
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Here is an error message from 6.11:
{{{
cmm/ZDF5ex.hs:528:2:
Couldn't match expected type `ZOpen'
against inferred type `ZClosed'
Expected type: ZipGF m l e x
Inferred type: ZipGF m l C O
In the first argument of `anal_f', namely `g'
In the expression: anal_f g (return . fromZJust) ZNothing
}}}
This is all very well, but the offending term (the one shown in the
message) is actually on line 697, not line 528. The term is part of one
declaration in a monster 'where' clause attached to the definition on line
528, column 2. The next one might not be so easy to find.
I'm attaching the file, which is part of some new GHC code I'm hoping to
deliver one of these months. If you need access to the whole thing I'll
have a branch in a git repository.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3193>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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