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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #597
Closed
Open
Issue created May 12, 2004 by Simon Marlow@simonmarDeveloper

Various error messages have inaccurate source locations

Some error messages lack source location information, or have inaccurate locations. Here are the ones we know about:

  • Should point to the import decl:
   ShowFunctions.hs:1:0
     Warning: Module `Text.Show.Functions' is imported, but nothing from it is used
  • Should point to the instance header:
   mod41.hs:3:0:
       Illegal instance declaration for `Eq (Either a a)'
         (The instance type must be of form (T a b c)
  • Should point to 'deriving *Eq*', not the tycon:
   tcfail046.hs:9:8:
     No instance for `Eq (Pid -> Time -> Message a -> (MessList a, Continuation a
))'
     When deriving the `Eq' instance for type `Continuation'
  • check_tau_type doesn't have location info?
   tcfail100.hs:7:0:
       Type synonym `A' should have 1 argument, but has been given 0
       In the type synonym declaration for `B'
  • Location in LHsModule from the parser should really span the whole file, rather than a point span at (1,0).
  • read016: should be the lhs only?
  • tcfail044: should be the instance head only.
Edited Mar 09, 2019 by Ian Lynagh <igloo@earth.li>
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