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February 2016

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Re: [GHC] #11518: Test TcCoercibleFail hangs with substitution sanity checks enabled
by GHC 01 Feb '16

01 Feb '16

#11518: Test TcCoercibleFail hangs with substitution sanity checks enabled -------------------------------------+------------------------------------- Reporter: niteria | Owner: niteria Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): OK. If the reason that the ASSERT gets exponentially expensive is that the types get exponentially large, that's a good explanation. That indeed is a hard problem (see e.g. #9198). But what's odd is that it doesn't bomb out on us when the ASSERT is not there. That seems odd to me -- if the types get very large I'd expect the type checker to fail even in the absence of the ASSERT. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11518#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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