December 2013 - ghc-tickets

[GHC] #8403: Pretty-printing of long types
by GHC 23 Jan '16

23 Jan '16

#8403: Pretty-printing of long types ------------------------------------+------------------------------------- Reporter: monoidal | Owner: Type: bug | Status: new Priority: lowest | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: Other Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Low priority, but this ghci output could be more packed. {{{ λ> :t (,,,,,,,,,,,,,,,,,,,,,,,) (,,,,,,,,,,,,,,,,,,,,,,,) :: a -> b -> c -> d -> e -> f -> g -> h -> i -> j -> k -> l -> m -> n -> o -> p -> q -> r -> s -> t -> u -> v -> w -> x -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x) }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8403> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8064: Warning out when "undefined" value has been used.
by GHC 23 Jan '16

23 Jan '16

#8064: Warning out when "undefined" value has been used. ------------------------------------+------------------------------------- Reporter: freizl | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Programmer may like to use "undefined" to define a function or value, which usually means "later implementation". However, people might forget to implement it thus cause run time error. Wish GHC will show some warning/errors at compilation. This idea comes from this article (http://www.devalot.com/articles/2013/07 /why-haskell.html) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8064> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8422: type nats solver is too weak!
by GHC 23 Jan '16

23 Jan '16

#8422: type nats solver is too weak! -------------------------------------+------------------------------------- Reporter: carter | Owner: Type: bug | Status: new Priority: highest | Milestone: 7.8.1 Component: Compiler (Type | Version: 7.7 checker) | Operating System: Unknown/Multiple Keywords: | Type of failure: GHC rejects Architecture: Unknown/Multiple | valid program Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------+------------------------------------- I just built ghc HEAD today, and the type nat solver can't handle the attached program, which *should* be simple to check! (and while I could use unsafeCoerce to "prove" it correct, that defeats the purpose of having the type nat solver!) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8422> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8618: can't load .so/.DLL
by GHC 22 Jan '16

22 Jan '16

#8618: can't load .so/.DLL -----------------------------------+--------------------------------------- Reporter: Feuerbach | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (NCG) | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time crash Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -----------------------------------+--------------------------------------- This happens in a fresh sandbox: {{{ % cabal install uniplate -j Resolving dependencies... Configuring syb-0.4.1... Configuring text-1.0.0.0... Building syb-0.4.1... Building text-1.0.0.0... Installed syb-0.4.1 Installed text-1.0.0.0 Configuring hashable-1.2.1.0... Building hashable-1.2.1.0... Installed hashable-1.2.1.0 Configuring unordered-containers-0.2.3.3... Building unordered-containers-0.2.3.3... Installed unordered-containers-0.2.3.3 Configuring uniplate-1.6.12... Building uniplate-1.6.12... Failed to install uniplate-1.6.12 Last 10 lines of the build log ( /home/feuerbach/.cabal/logs/uniplate-1.6.12.log ): Preprocessing library uniplate-1.6.12... [ 1 of 21] Compiling Data.Generics.Uniplate.Data.Instances ( Data/Generics/Uniplate/Data/Instances.hs, dist/build/Data/Generics/Uniplate/Data/Instances.o ) [ 2 of 21] Compiling Data.Generics.Uniplate.Internal.Utils ( Data/Generics/Uniplate/Internal/Utils.hs, dist/build/Data/Generics/Uniplate/Internal/Utils.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package array-0.5.0.0 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package bytestring-0.10.4.0 ... linking ... done. Loading package text-1.0.0.0 ... <command line>: can't load .so/.DLL for: libHStext-1.0.0.0.so (libHStext-1.0.0.0.so: cannot open shared object file: No such file or directory) cabal: Error: some packages failed to install: uniplate-1.6.12 failed during the building phase. The exception was: ExitFailure 1 }}} I have shared: False in cabal.config, so it's not surprising that libHStext-1.0.0.0.so is not found. What is surprising is that it's needed. uniplate doesn't use TemplateHaskell, from what I can tell. This is GHC 7.7.20131217. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8618> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8586: internal error: evacuate(static): strange closure type 5189
by GHC 22 Jan '16

22 Jan '16

#8586: internal error: evacuate(static): strange closure type 5189 ----------------------------+------------------------------- Reporter: guest | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: crash | Operating System: Windows Architecture: x86 | Type of failure: GHCi crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------+------------------------------- I cannot reproduce this reliably, but it happened once. Here’s what I did: * Install Yesod * Scaffold a blank Yesod project with no DB * Run GHCi * :l Foundation.hs * :info AForm Output: {{{ newtype AForm m a = AForm {unAForm :: (HandlerSite m, [Text]) -> Maybe (Env, FileEnv) -> Ints -> m (FormResult a, [FieldView (HandlerSite m)] -> [FieldView (HandlerSite m)], Ints, Enctype)} -- Defined in `Yesod.Form.Types' instance Monad m => Functor (AForm m) -- Defined in `Yesod.Form.Types' instance (Monad m, Monoid a) => Monoid (AForm m a) -- Defined in `Yesod.Form.Types' instance MonadTransghc.exe: internal error: evacuate(static): strange closure type 5189 (GHC version 7.6.3 for i386_unknown_mingw32) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. }}} (P.S. I chose 'x86' for the Architecture because it’s running as 32-bit, but I’m actually using 64-bit Windows.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8586> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8605: Alternative, guard-like syntax for view patterns
by GHC 22 Jan '16

22 Jan '16

#8605: Alternative, guard-like syntax for view patterns ------------------------------------+------------------------------------- Reporter: cactus | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Implement the alternative syntax for view patterns described on the ViewPatternsAlternative wiki page -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8605> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8114: GHC panic when building `thyme`
by GHC 17 Jan '16

17 Jan '16

#8114: GHC panic when building `thyme` -----------------------------------+--------------------------------------- Reporter: Ptharien's | Owner: Flame | Status: new Type: bug | Milestone: Priority: normal | Version: 7.6.3 Component: Compiler | Operating System: MacOS X Keywords: | Type of failure: Compile-time crash Architecture: x86_64 (amd64) | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -----------------------------------+--------------------------------------- While attempting to build `thyme` from Hackage with core, stg, and cmm linting and -O2 enabled, GHC crashed with an internal panic. See attached terminal log. {{{ rrdhcp-10-32-234-247:thyme-0.2.4.1 Alexander$ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.6.3 rrdhcp-10-32-234-247:thyme-0.2.4.1 Alexander$ cabal --version cabal-install version 1.16.0.2 using version 1.16.0 of the Cabal library rrdhcp-10-32-234-247:thyme-0.2.4.1 Alexander$ which ghc /usr/local/bin/ghc rrdhcp-10-32-234-247:thyme-0.2.4.1 Alexander$ which cabal /Users/Alexander/Library/Haskell/bin/cabal }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8114> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8613: simplifier ticks exhausted
by GHC 14 Jan '16

14 Jan '16

#8613: simplifier ticks exhausted ----------------------------------+---------------------------- Reporter: guest | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: MacOS X Architecture: x86_64 (amd64) | Type of failure: Other Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+---------------------------- (Sent by chrisreade(a)mac.com ) Compiler giving up with simplifier ticks exhausted. Large amount of simplification may be going on to cause this. The problem goes away when using -fsimpl-tick-factor=1000 and the code runs. This is the session output without the flag (asking to have bug reported): chris$ ghc -O2 -rtsopts RedBlackStencilOpt.hs -v Glasgow Haskell Compiler, Version 7.6.3, stage 2 booted by GHC version 7.4.2 Using binary package database: /Library/Frameworks/GHC.framework/Versions/7.6.3-x86_64/usr/lib/ghc-7.6.3/package.conf.d/package.cache Using binary package database: /Users/chris/.ghc/x86_64-darwin-7.6.3/package.conf.d/package.cache hiding package binary-0.5.1.1 to avoid conflict with later version binary-0.6.4.0 hiding package Cabal-1.16.0 to avoid conflict with later version Cabal-1.18.1.1 wired-in package ghc-prim mapped to ghc- prim-0.3.0.0-d5221a8c8a269b66ab9a07bdc23317dd wired-in package integer-gmp mapped to integer- gmp-0.5.0.0-2f15426f5b53fe4c6490832f9b20d8d7 wired-in package base mapped to base-4.6.0.1-6c351d70a24d3e96f315cba68f3acf57 wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.8.0.0-c2c1b21dbbb37ace4b7dc26c966ec664 wired-in package dph-seq not found. wired-in package dph-par not found. Hsc static flags: -static *** Chasing dependencies: Chasing modules from: *RedBlackStencilOpt.hs Stable obj: [] Stable BCO: [] Ready for upsweep [NONREC ModSummary { ms_hs_date = 2013-12-13 13:12:37 UTC ms_mod = main:RedBlackStencilOpt, ms_textual_imps = [import (implicit) Prelude, import Data.Array.Repa.Stencil.Dim2 as A, import Data.Array.Repa.Stencil as A, import Data.Array.Repa as A] ms_srcimps = [] }] *** Deleting temp files: Deleting: compile: input file RedBlackStencilOpt.hs Created temporary directory: /var/folders/dz/m1mks1yn1bsft72zgh105sw40000gn/T/ghc93155_0 *** Checking old interface for main:RedBlackStencilOpt: [1 of 1] Compiling RedBlackStencilOpt ( RedBlackStencilOpt.hs, RedBlackStencilOpt.o ) *** Parser: *** Renamer/typechecker: *** Simplify: *** CorePrep: *** ByteCodeGen: Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. *** gcc: '/usr/bin/gcc' '-m64' '-fno-stack-protector' '-m64' '-L/Library/Frameworks/GHC.framework/Versions/7.6.3-x86_64/usr/lib/ghc-7.6.3/base-4.6.0.1' '--print-file-name' 'libiconv.dylib' Loading package base ... linking ... done. Loading package pretty-1.1.1.0 ... linking ... done. Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done. Loading package containers-0.5.0.0 ... linking ... done. Loading package old-locale-1.0.0.5 ... linking ... done. Loading package time-1.4.0.1 ... linking ... done. Loading package random-1.0.1.1 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package QuickCheck-2.6 ... linking ... done. Loading package bytestring-0.10.0.2 ... linking ... done. Loading package primitive-0.5.0.1 ... linking ... done. Loading package vector-0.10.0.1 ... linking ... done. Loading package repa-3.2.3.3 ... linking ... done. *** Simplify: *** CorePrep: *** ByteCodeGen: *** Desugar: Result size of Desugar (after optimization) = {terms: 900, types: 1,810, coercions: 340} *** Simplifier: Result size of Simplifier iteration=1 = {terms: 834, types: 1,757, coercions: 567} Result size of Simplifier iteration=2 = {terms: 830, types: 1,721, coercions: 567} Result size of Simplifier = {terms: 830, types: 1,721, coercions: 567} *** Specialise: Result size of Specialise = {terms: 830, types: 1,721, coercions: 567} *** Float out(FOS {Lam = Just 0, Consts = True, PAPs = False}): Result size of Float out(FOS {Lam = Just 0, Consts = True, PAPs = False}) = {terms: 993, types: 2,131, coercions: 567} *** Float inwards: Result size of Float inwards = {terms: 993, types: 2,131, coercions: 567} *** Simplifier: *** Deleting temp files: Deleting: /var/folders/dz/m1mks1yn1bsft72zgh105sw40000gn/T/ghc93155_0/ghc93155_0.s Warning: deleting non-existent /var/folders/dz/m1mks1yn1bsft72zgh105sw40000gn/T/ghc93155_0/ghc93155_0.s *** Deleting temp dirs: Deleting: /var/folders/dz/m1mks1yn1bsft72zgh105sw40000gn/T/ghc93155_0 ghc: panic! (the 'impossible' happened) (GHC version 7.6.3 for x86_64-apple-darwin): Simplifier ticks exhausted When trying RuleFired Class op szipWith To increase the limit, use -fsimpl-tick-factor=N (default 100) If you need to do this, let GHC HQ know, and what factor you needed To see detailed counts use -ddump-simpl-stats Total ticks: 60402 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8613> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8060: Undefined symbols when using Template Haskell linked from another object with unexposed modules
by GHC 08 Jan '16

08 Jan '16

#8060: Undefined symbols when using Template Haskell linked from another object with unexposed modules -----------------------------------+--------------------------------------- Reporter: tvynr | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Linux Architecture: | Type of failure: Compile-time crash Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -----------------------------------+--------------------------------------- I have constructed two Cabal projects named "first" and "second". The "first" project defines three files: Logging.hs (which provides some basic logging functionality) and FirstExample.hs and FirstDependent.hs (the latter of which imports the former). In the cabal file, only Logging and FirstDependent are exposed modules. FirstDependent uses a Template Haskell function "loggingFunctions" which defines logging functions for that module. Using cabal or cabal-dev to build this package works quite nicely. The second project depends on the first project and contains a single file, Second.hs. This file imports Logging but neither of the other two files. It also uses the loggingFunctions routine to generate local logging functions. The presence of the "$(loggingFunctions)" splice in Second.hs makes the problem visible, but the real problem is in the first project. Upon compilation of the "second" project with cabal or cabal- dev, the following error is generated: {{{ cabal-dev -s ../cabal-dev-sandbox --with-cabal-install=cabal configure Resolving dependencies... Configuring second-0.1... cabal-dev -s ../cabal-dev-sandbox --with-cabal-install=cabal build Building second-0.1... Preprocessing library second-0.1... [1 of 1] Compiling Second ( lib-src/Second.hs, dist/build/Second.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done. Loading package containers-0.5.0.0 ... linking ... done. Loading package filepath-1.3.0.1 ... linking ... done. Loading package old-locale-1.0.0.5 ... linking ... done. Loading package time-1.4.0.1 ... linking ... done. Loading package bytestring-0.10.0.2 ... linking ... done. Loading package unix-2.6.0.1 ... linking ... done. Loading package directory-1.2.0.1 ... linking ... done. Loading package transformers-0.3.0.0 ... linking ... done. Loading package mtl-2.1.2 ... linking ... done. Loading package text-0.11.3.1 ... linking ... done. Loading package parsec-3.1.3 ... linking ... done. Loading package network-2.4.1.2 ... linking ... done. Loading package process-1.1.0.2 ... linking ... done. Loading package hslogger-1.2.1 ... linking ... done. Loading package pretty-1.1.1.0 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package first-0.2 ... linking ... ghc: /home/some- directories/example/first/../cabal-dev- sandbox//lib/first-0.2/ghc-7.6.1.20121207/HSfirst-0.2.o: unknown symbol `firstzm0zi2_FirstExample_zdfShowErrorSpec3_closure' ghc: unable to load package `first-0.2' make[1]: *** [build] Error 1 }}} Upon further investigation, it would seem that the .o file constructed to represent the "first" project has not been completely constructed: {{{ $ objdump -t cabal-dev- sandbox/lib/first-0.2/ghc-7.6.1.20121207/HSfirst-0.2.o | grep '\*UND\*' | grep first 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfOrdErrorSpeczuzdczg_info 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfShowErrorSpec3_closure 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfOrdErrorSpeczuzdczl_info 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfEqErrorSpeczuzdczeze_info 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfOrdErrorSpeczuzdczlze_info 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfOrdErrorSpeczuzdccompare_info 00000000 *UND* 00000000 firstzm0zi2_FirstExample_zdfOrdErrorSpeczuzdczgze_info }}} (While the above dump is for ghc 7.6.1, this has also been tested on ghc 7.6.3 as well as on both i386- and amd64-based OS installs.) If the "$(loggingFunctions)" splice is removed from Second.hs, then the project builds (presumably because the logic used by non-Template Haskell projects for linking differs from that of Template Haskell projects). Fortunately, it seems that exposing every module of the "first" project resolves this issue. But please note that the FirstExample.hs and FirstDependent.hs files are completely unrelated to the Second.hs file; the latter does not depend on the former in any way. It seems strange that I can't use Template Haskell across projects without exposing all of my project modules. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8060> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8560: undeducable Typeable error with data kinds when deriving Data for GADT in GHC version 7.7.20131122
by GHC 05 Jan '16

05 Jan '16

#8560: undeducable Typeable error with data kinds when deriving Data for GADT in GHC version 7.7.20131122 ------------------------------------+------------------------------------- Reporter: carter | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- This may be an artifact of issue #8128 (see https://ghc.haskell.org/trac/ghc/ticket/8128#comment:5) but I'm seeing examples involving data kinds where Typeable isn't deducible. This could be an artifact of other problems, BUT since with 7.7 onwards, we have baked in polykinded Typeable, things should always "just work™" right? the error with current head is as follows (and i'm attaching the code + current finger print too) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8560> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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