#5032: putting left equation sides in parantheses causes GHC.Prim.Any
specialization
-------------------------------+--------------------------------------------
Reporter: jeltsch | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.12.1 | Keywords:
Testcase: | Blockedby:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: None/Unknown
-------------------------------+--------------------------------------------
I put this code into a file:
{{{
identity : a -> a
(identity) = id
}}}
I get this error message:
{{{
Inferred type is less polymorphic than expected
Quantified type variable `a' escapes
In the expression: id
In a pattern binding: (identity) = id
}}}
This may be correct, I don’t know.
However, I can also do this:
{{{
(identity) = id
}}}
GHCi accepts this. If I enter {{{:type identity}}} into GHCi, I get this:
{{{
identity :: GHC.Prim.Any -> GHC.Prim.Any
}}}
This seems weird, in my opinion.
This is also accepted by GHCi:
{{{
(identity) = id
hello = identity "hello"
}}}
Evaluating {{{hello}}} yields {{{"hello"}}}, and {{{:type identity}}}
yields this:
{{{
identity :: [Char] -> [Char]
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5032>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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