#3092: algebraic data types can be extended by data instance declarations
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Reporter: jeltsch | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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The following program is accepted by GHC:
{{{
{-# LANGUAGE TypeFamilies #-}
data T a = C
data instance T Int = CInt
data instance T Bool = CBool
}}}
I think, it shouldn’t.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3092>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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