#2431: allow empty case analysis
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Reporter: RalfHinze | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 6.8.3 | Severity: minor
Keywords: empty case analysis | Testcase:
Architecture: Unknown | Os: Unknown
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Using -XEmptyDataDecls I can declare an (almost) empty data type.
data Void
However, I can't use an empty case to discriminate values of the
empty type.
This does not work:
get :: Void -> a
Only the type signature, but no body. [This would be useful also
in other circumstances.]
get :: Void -> a
get v = case v of { }
An empty case in the body.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2431>
GHC <http://www.haskell.org/ghc/>
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