#2360: More information in occurs check message
--------------------------------+-------------------------------------------
Reporter: ajd | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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{{{
$ cat A.hs
module A
where
foo :: [a] -> a
foo = id
$ ghc -c A.hs
A.hs:5:0:
Occurs check: cannot construct the infinite type: a = [a]
When generalising the type(s) for `foo'
}}}
It would be nice if GHC could give more information about where and how
the error is being generated, for example which expressions are making it
try to unify a and [a]. (Especially in more complicated functions, it can
be difficult to track down the bug.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2360>
GHC <http://www.haskell.org/ghc/>
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