#7175: Panic when wrongly using a type family as return types for GADTs
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Reporter: goldfire | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.6.1-rc1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj@…):
commit d0ddde58f928a6b156d8061c406226c4fbb7cd22
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Wed Aug 29 11:33:33 2012 +0100
Fail earlier if there's an error in a type declaration
This change means that we don't recover from erroneous type
declarations, thereby reporting fewer errors. But trying to
recover confused GHC (leading to a pattern match failure in
the compiler Trac #7175), and it turned out to be tricky
to fix that.
So this patch takes the more conservative path of failing
earlier, perhaps reporting fewer real errors.
compiler/typecheck/TcTyClsDecls.lhs | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7175#comment:1>
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