#2033: GHC-6.9 panics rather than parse error, related to view patterns.
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Reporter: apeacock | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.10 branch
Component: Compiler | Version: 6.9
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86
Os: Windows |
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Comment (by simonpj):
Ian, I guess you understand what is going on here? Patterns are parsed as
expressions, and then converted to patterns. The form (e -> p), the
`EViewPat` constructor in `HsExpr`, is valid as a pattern, but not as as
expression. Just like `EWildPat`, `EAsPat`, `ELazyPat`.
The renamer checks for these (line 280 of `RnExpr`), so it's just a qn of
adding `EViewPat` there too. The error message isn't fantastic, but it's
better than a crash.
I'll let you finish this since you've started.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2033#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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