#3577: Complete support for Data Parallel Haskell
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Reporter: rl | Owner: rl
Type: feature request | Status: new
Priority: normal | Milestone: _|_
Component: Data Parallel Haskell | Version: 6.13
Keywords: | Difficulty: Unknown
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Compile-time crash
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Comment(by benl):
Can't pattern match on values of `[::]` type.
Rewrite this:
{{{
joinEmpty :: [:[:Word8:]:] -> [:[:Word8:]:]
joinEmpty ws
= case ws of
[:[::]:] -> [::]
_ -> ws
}}}
as:
{{{
joinEmpty :: [:[:Word8:]:] -> [:[:Word8:]:]
joinEmpty ws
| lengthP ws I.== 1
&& lengthP (ws !: 0) I.== 0
= [::]
| otherwise
= ws
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3577#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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