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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #674
Closed
Open
Issue created Jan 28, 2006 by guest@trac-guest

Bad error message: varying arguments

A function definition like

f :: Maybe () -> Char
f Nothing = 'a'
f Just () = 'b'

yields the error message

Varying number of arguments for function `f'

under 6.4.1 (pointing to the line with Nothing as containing the error). The following error message would be easier to understand for beginners (pointing to the line with Just):

The type signature for f specifies that the function should take one argument, but you have given it two arguments.

Trac metadata
Trac field Value
Version 6.4.1
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
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Operating system Unknown
Architecture Unknown
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