#2674: ghc panic TcPat.checkArgs
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Reporter: rwbarton | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.8.2
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown/Multiple
Os: Unknown/Multiple |
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Changes (by simonpj):
* difficulty: => Unknown
Comment:
Thanks. What's happening is this. The parser ensures that a case
expression never has zero alternatives, and `checkArgs` assumes this is
the case; but Template Haskell makes no such guarantee.
The right thing to do is to check for this when converting from TH to
`HsSyn`; I've already added some such checks and will add a new one for
this case.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2674#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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