[GHC] #12692: Can't find interface-file decl with Typeable
#12692: Can't find interface-file decl with Typeable -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The attached code produces the following error: {{{ GHC error in desugarer lookup in Main: Can't find interface-file declaration for variable $tc'(,) Probable cause: bug in .hi-boot file, or inconsistent .hi file Use -ddump-if-trace to get an idea of which file caused the error ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): initDs IOEnv failure }}} when I run `stack bench lol`. The issue seems to be related to `Typeable` instances for types created with singletons. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12692 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12692: Can't find interface-file decl with Typeable -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by crockeea): * Attachment "bug.tar.gz" added. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12692 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12692: Can't find interface-file decl with Typeable -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): If anyone can offer an easy way to reproduce this, it'd be great. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12692#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12692: Can't find interface-file decl with Typeable -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.0.2 Component: Compiler | Version: 8.0.1 Resolution: duplicate | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: #12132 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: new => closed * resolution: => duplicate * related: => #12132 * milestone: => 8.0.2 Comment: This is really #12132 in disguise (which has been fixed in GHC 8.0.2 and HEAD). You can see this by observing the output of compiling `Main` with `-ddump-splices`: {{{ [3 of 3] Compiling Main ( Main.hs, interpreted ) Main.hs:7:3-26: Splicing declarations sequence [ppDec $ (2, 1)] ======> type PP2 = PP '(P (PosBin.D0 PosBin.B1), PosBin.O) }}} The key part is that `PP2` contains a promoted boxed tuple, and the error happens when you try to get the `Typeable` instance for it. In any case, this has already been fixed, and it'd be impractical to create a regression test from all of this `singletons` code, so I'll just close this as a duplicate. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12692#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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