[GHC] #10817: Looping default associated type family without UndecidableInstances
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- When I say {{{ {-# LANGUAGE TypeFamilies #-} module Bug where import Data.Proxy class C a where type F a type F a = F a instance C Bool x :: Proxy (F Bool) x = Proxy }}} GHC just loops. Setting a low `-ftype-function-depth` doesn't help. I actually don't terribly mind the looping (although aborting with an overflow would be better). But I don't like that it's possible without `UndecidableInstances` in sight. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * component: Compiler => Compiler (Type checker) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by jstolarek): * cc: jstolarek (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: Phab:D1262 -------------------------------------+------------------------------------- Changes (by goldfire): * status: new => patch * differential: => Phab:D1262 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances
-------------------------------------+-------------------------------------
Reporter: goldfire | Owner:
Type: bug | Status: patch
Priority: normal | Milestone:
Component: Compiler (Type | Version: 7.10.2
checker) |
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Revisions: Phab:D1262
-------------------------------------+-------------------------------------
Comment (by Richard Eisenberg
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: merge Priority: normal | Milestone: 7.10.3 Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: indexed- | types/should_fail/T10817 Blocked By: | Blocking: Related Tickets: | Differential Revisions: Phab:D1262 -------------------------------------+------------------------------------- Changes (by goldfire): * status: patch => merge * testcase: => indexed-types/should_fail/T10817 * milestone: => 7.10.3 Comment: Worth merging this one. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: merge Priority: normal | Milestone: 7.10.3 Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: indexed- | types/should_fail/T10817 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1262 -------------------------------------+------------------------------------- Comment (by bgamari): goldfire, do you suppose you could backport this to `ghc-7.10`? I tried but there have been just enough differences in this area that I'm not sure I trust myself to get this right. Alternatively we could just punt. Your call. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: merge Priority: normal | Milestone: 7.10.3 Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: indexed- | types/should_fail/T10817 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1262 -------------------------------------+------------------------------------- Comment (by goldfire): I'll take a look at this today. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: merge Priority: normal | Milestone: 7.10.3 Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: indexed- | types/should_fail/T10817 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1262 -------------------------------------+------------------------------------- Comment (by goldfire): I've just pushed a patch (relative to `ghc-7.10`) to `wip/rae`. (See commit 8b69b318802f59cfeb0779779cfbbebf74348fa0.) I can't validate because of the problem Simon already mentioned about `ghc-7.10` not building. But hopefully this is only a typo or two away from working. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: closed Priority: normal | Milestone: 7.10.3 Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: indexed- | types/should_fail/T10817 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1262 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: merge => closed * resolution: => fixed -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10817#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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