#7175: Panic when wrongly using a type family as return types for GADTs --------------------------------+------------------------------------------- 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: | --------------------------------+-------------------------------------------
Comment(by simonpj@…): commit d0ddde58f928a6b156d8061c406226c4fbb7cd22 {{{ Author: Simon Peyton Jones <simo...@microsoft.com> 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> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs