[GHC] #12819: Pattern synonym signatures are not validity-checked
#12819: Pattern synonym signatures are not validity-checked -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 (Type checker) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: GHC accepts Unknown/Multiple | invalid program Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Ponder this garbage: {{{#!hs {-# LANGUAGE PatternSynonyms, ViewPatterns, TypeFamilies, KindSignatures #-} module Bug where type family F a -- F :: * -> * data T :: (* -> *) -> * pattern Q :: T F -> String pattern Q x <- (undefined -> x) }}} This is accepted by GHC 8.0.1 and HEAD. But it has an unsaturated type family! Urk! The problem is that `TcSigs.tcPatSynSig` never does validity checking. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12819 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12819: Pattern synonym signatures are not validity-checked
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Reporter: goldfire | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type | Version: 8.1
checker) |
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: GHC accepts | Unknown/Multiple
invalid program | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Ben Gamari
#12819: Pattern synonym signatures are not validity-checked -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => fixed * milestone: => 8.2.1 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12819#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12819: Pattern synonym signatures are not validity-checked -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: GHC accepts | Test Case: invalid program | patsyn/should_fail/T12819 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by goldfire): * testcase: => patsyn/should_fail/T12819 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12819#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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