March 2016 - ghc-tickets

Re: [GHC] #2350: hSetEcho: failed (failed to set echoing) on Windows
by GHC 24 Mar '16

24 Mar '16

#2350: hSetEcho: failed (failed to set echoing) on Windows -------------------------------------+------------------------------------- Reporter: EricKow | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: libraries/base | Version: 6.8.2 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * failure: => None/Unknown Comment: The commit message in comment:4 was obviously supposed to refer to #2530. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2350#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #2530: deriving Show adds extra parens for constructor with record syntax
by GHC 24 Mar '16

24 Mar '16

#2530: deriving Show adds extra parens for constructor with record syntax -------------------------------------+------------------------------------- Reporter: spl | Owner: bgamari Type: bug | Status: merge Priority: highest | Milestone: 8.0.1 Component: Compiler | Version: 6.8.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D669, Wiki Page: | Phab:D2027 -------------------------------------+------------------------------------- Changes (by bgamari): * status: patch => merge -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2530#comment:40> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11720: pureMD5: Simplifier ticks exhausted
by GHC 24 Mar '16

24 Mar '16

#11720: pureMD5: Simplifier ticks exhausted -------------------------------------+------------------------------------- Reporter: trommler | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1-rc2 Keywords: | Operating System: Linux Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- GHC panics with simplifier ticks exhausted on powerpc, powerpc64, and powerpc64le compiling pureMD5: {{{ [ 43s] [1 of 1] Compiling Data.Digest.Pure.MD5 ( Data/Digest/Pure/MD5.hs, dist/build/Data/Digest/Pure/MD5.o ) [...] [ 46s] ghc: panic! (the 'impossible' happened) [ 46s] (GHC version 8.0.0.20160204 for powerpc64le-unknown-linux): [ 46s] Simplifier ticks exhausted [ 46s] When trying UnfoldingDone $ [ 46s] To increase the limit, use -fsimpl-tick-factor=N (default 100) [ 46s] If you need to do this, let GHC HQ know, and what factor you needed [ 46s] To see detailed counts use -ddump-simpl-stats [ 46s] Total ticks: 168807 }}} pureMD5 compiles on i586 and x86_64. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11720> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #2530: deriving Show adds extra parens for constructor with record syntax
by GHC 24 Mar '16

24 Mar '16

#2530: deriving Show adds extra parens for constructor with record syntax -------------------------------------+------------------------------------- Reporter: spl | Owner: bgamari Type: bug | Status: patch Priority: highest | Milestone: 8.0.1 Component: Compiler | Version: 6.8.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D669, Wiki Page: | Phab:D2027 -------------------------------------+------------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"1448f8ab2379452312f1f74f6d5ba4de8ad3d47e/ghc" 1448f8ab/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="1448f8ab2379452312f1f74f6d5ba4de8ad3d47e" Show: Restore redundant parentheses around records As discussed in #2530 we are going to continue to produce parentheses here in order to preserve compatibility with previous GHC releases. It was found that dropped parentheses would break some testsuites which compared against output from Show. This has been documented in the users guide. This reverts commit 5692643c9d17e746327588cd6157a923642b7975. Test Plan: Validate Reviewers: hvr, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2027 GHC Trac Issues: #2350 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2530#comment:39> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #2350: hSetEcho: failed (failed to set echoing) on Windows
by GHC 24 Mar '16

24 Mar '16

#2350: hSetEcho: failed (failed to set echoing) on Windows -------------------------------------+--------------------------------- Reporter: EricKow | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: libraries/base | Version: 6.8.2 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Test Case: | -------------------------------------+--------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"1448f8ab2379452312f1f74f6d5ba4de8ad3d47e/ghc" 1448f8ab/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="1448f8ab2379452312f1f74f6d5ba4de8ad3d47e" Show: Restore redundant parentheses around records As discussed in #2530 we are going to continue to produce parentheses here in order to preserve compatibility with previous GHC releases. It was found that dropped parentheses would break some testsuites which compared against output from Show. This has been documented in the users guide. This reverts commit 5692643c9d17e746327588cd6157a923642b7975. Test Plan: Validate Reviewers: hvr, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2027 GHC Trac Issues: #2350 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2350#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11145: Template Haskell quotes of data instance GADTs is totally broken
by GHC 24 Mar '16

24 Mar '16

#11145: Template Haskell quotes of data instance GADTs is totally broken -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Template | Version: 7.10.2 Haskell | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When I say {{{ data family Fuggle x y [d| data instance Fuggle Int (Maybe (a,b)) where MkFuggle :: Fuggle Int (Maybe Bool) |] }}} I get (with `-ddump-splices`) {{{ [d| data instance Fuggle Int (Maybe (a_ajz6, b_ajz7)) where MkFuggle_ajz5 :: Fuggle Int (Maybe Bool) |] ======> data instance Fuggle Int (Maybe (a_ajAf, b_ajAg)) = (b_ajAg ~ Maybe Bool, a_ajAf ~ Int) => MkFuggle_ajAe }}} But that's not at all what I said! Admittedly, what I said was garbage, but it should fail outright. Is this addressed by Phab:D1465? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11145> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9405: Ticky results should be displayed even during interrupts (Ctrl-c)
by GHC 24 Mar '16

24 Mar '16

#9405: Ticky results should be displayed even during interrupts (Ctrl-c) -------------------------------------+------------------------------------- Reporter: thoughtpolice | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- After talking with Simon & Simon today, we discussed ticky profiling, and it dawned on us that ticky probably isn't reported when the program is interrupted via the user. But it should be! The motivating case is when you're dealing with an infinite loop and you want to find the binding that has a high entry count (i.e. it's the looping body). But the only way to move forward is to interrupt it, which doesn't spit out the reports. Fixing this would make ticky much more useful in such cases. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9405> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11653: Time compiler passes
by GHC 24 Mar '16

24 Mar '16

#11653: Time compiler passes -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: feature | Status: new request | Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- It would be very useful if the compiler would produce timings of various phases of compilation. Even better, if could produce allocation numbers as well. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11653> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10320: -ddump-to-file should create empty dump files when there was nothing to dump
by GHC 24 Mar '16

24 Mar '16

#10320: -ddump-to-file should create empty dump files when there was nothing to dump -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.10.1 Keywords: newcomer | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- For example, I ran with -ddump-rule-firings -ddump-to-file when there were no rule firings. GHC should have created an empty foo.dump-rule-firings file. (Instead it left the existing foo.dump-rule-firings from a previous run intact, which could have been misleading if I didn't already know that the most recent run had no rule firings.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10320> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11710: Fusion of a simple listArray call is very fragile
by GHC 24 Mar '16

24 Mar '16

#11710: Fusion of a simple listArray call is very fragile -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime Unknown/Multiple | performance bug Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Consider the following (taken from ticket:11707#comment:2), {{{#!hs module Test where import Data.Array arr, arr2 :: Array Int Int arr = listArray (0,10) [ 1,1,1,1,1,1,1,1,1,1 ] arr2 = listArray (0,10) [ 1,1,1,1,1,1,1,1,1,-1 ] }}} Given that these are a small array, one might suspect it would be worthwhile for GHC to fuse the lists with `listArray`, giving rise to two nicely unrolled construction procedures. However, if you look at the Core produced by `-O1` this you'll find that this only happens in the case of `arr2`. `arr` on the other handle, is mysteriously not fused. The fact that these expressions are so similar and yet produce entirely different code is quite worrying. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11710> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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