September 2015 - ghc-tickets

Re: [GHC] #7428: GHC compile times are seriously non-linear in program size
by GHC 16 Sep '15

16 Sep '15

#7428: GHC compile times are seriously non-linear in program size -------------------------------------+------------------------------------- Reporter: nudded | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.4.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * failure: Compile-time crash => Compile-time performance bug -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7428#comment:23> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] Batch modify: #6132, #7650, #4176, #8556
by GHC 16 Sep '15

16 Sep '15

Batch modification to #6132, #7650, #4176, #8556 by thomie: component to Compiler (Parser) -- Tickets URL: <http://ghc.haskell.org/trac/ghc/query?id=6132%2C7650%2C4176%2C8556> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] Batch modify: #8618, #9074, #10531
by GHC 16 Sep '15

16 Sep '15

Batch modification to #8618, #9074, #10531 by thomie: component to Compiler (Linking) -- Tickets URL: <http://ghc.haskell.org/trac/ghc/query?id=8618%2C9074%2C10531> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10887: Please export GhcMake.downsweep and make it return a partial module graph in case of errors
by GHC 16 Sep '15

16 Sep '15

#10887: Please export GhcMake.downsweep and make it return a partial module graph in case of errors -------------------------------------+------------------------------------- Reporter: DanielG | Owner: Type: feature | Status: new request | 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: | -------------------------------------+------------------------------------- Hi, in ghc-mod we have to essentially run a downsweep before we have any idea what `-package` flags to pass to GHC. We do this in order to figure out which modules belong to each Cabal component. If we use `depanal` to do this it will unfortunately just throw import errors because we haven't actually told GHC which package should be in scope yet. I think depanal/downsweep also abort on some other types of errors, which would also have to be cought since ghc-mod needs to work even when there are modules with parse errors etc (because the user is still editing them). I'm not sure where ghc parses the module headers so I'm not sure if it's going to blow up horribly when a module header doesn't parse or if that's just going to make downsweep return failure too. For the time being we essentially just re-implemented downsweep's functionality .. poorly but I'd really rather use downsweep directly. Thanks. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10887> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10305: Windows validate failures
by GHC 16 Sep '15

16 Sep '15

#10305: Windows validate failures -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Running `sh validate --fast` on Windows gives the error log below. There seem to be at least three problems * Some unexpected failures. Let's ignore those for now, since they are probably all different * Some Python traceback stuff; this must be a bug. * Tons of warnings about `haddock-interfaces` Could someone help with these. Yes, I can just ignore all this output, but it seems wrong. Thanks Simon {{{ OVERALL SUMMARY for test run started at 04/14/15 22:37:45 GMT Daylight Time 0:53:23 spent to go through 4437 total tests, which gave rise to 13186 test cases, of which 9122 were skipped 53 had missing libraries 3915 expected passes 79 expected failures 4 caused framework failures 2 unexpected passes 7 unexpected failures 5 unexpected stat failures Unexpected passes: rts T5250 (normal) rts linker_unload (normal) Unexpected failures: ../../libraries/base/tests/System Timeout001 [bad exit code] (normal) codeGen/should_compile debug [bad exit code] (normal) ghc-e/should_fail T9930fail [bad exit code] (normal) ghci/linking T1407 [bad stderr] (ghci) ghci/scripts T5975a [bad stderr] (ghci) ghci/scripts T9878b [bad exit code] (ghci) stranal/should_run T10148 [bad stderr] (optasm) Unexpected stat failures: perf/compiler T5030 [stat too good] (normal) perf/compiler T5837 [stat too good] (normal) perf/compiler T783 [stat not good enough] (normal) perf/compiler T9872d [stat not good enough] (normal) perf/should_run T9203 [stat not good enough] (normal) Traceback (most recent call last): File "C:\code\HEAD\testsuite\driver\testlib.py", line 806, in do_test result = func(*[name,way] + args) File "C:\code\HEAD\testsuite\driver\testlib.py", line 1121, in stats return checkStats(name, way, stats_file, opts.stats_range_fields) File "C:\code\HEAD\testsuite\driver\testlib.py", line 1131, in checkStats f = open(in_testdir(stats_file)) IOError: [Errno 2] No such file or directory: './perf/haddock/../../../../libraries/base/dist- install/doc/html/base/base.haddock.t' Traceback (most recent call last): File "C:\code\HEAD\testsuite\driver\testlib.py", line 806, in do_test result = func(*[name,way] + args) File "C:\code\HEAD\testsuite\driver\testlib.py", line 1121, in stats return checkStats(name, way, stats_file, opts.stats_range_fields) File "C:\code\HEAD\testsuite\driver\testlib.py", line 1131, in checkStats f = open(in_testdir(stats_file)) IOError: [Errno 2] No such file or directory: './perf/haddock/../../../../libraries/Cabal/Cabal/dist- install/doc/html/Cabal/Cabal.haddock.t' Traceback (most recent call last): File "C:\code\HEAD\testsuite\driver\testlib.py", line 806, in do_test result = func(*[name,way] + args) File "C:\code\HEAD\testsuite\driver\testlib.py", line 1121, in stats return checkStats(name, way, stats_file, opts.stats_range_fields) File "C:\code\HEAD\testsuite\driver\testlib.py", line 1131, in checkStats f = open(in_testdir(stats_file)) IOError: [Errno 2] No such file or directory: './perf/haddock/../../../../compiler/stage2/doc/html/ghc/ghc.haddock.t' make[2]: Leaving directory '/cygdrive/c/code/HEAD/testsuite/tests' make[1]: Leaving directory '/cygdrive/c/code/HEAD/testsuite/tests' == Start post-testsuite package check Timestamp 2015-04-07 22:25:31 UTC for C:\Users\simonpj\AppData\Roaming\ghc\i386-mingw32-7.11.20150407\package.conf.d\package.cache Timestamp 2015-04-07 22:25:31 UTC for C:\Users\simonpj\AppData\Roaming\ghc\i386-mingw32-7.11.20150407\package.conf.d (same as cache) using cache: C:\Users\simonpj\AppData\Roaming\ghc\i386-mingw32-7.11.20150407\package.conf.d\package.cache Timestamp 2015-04-14 21:31:48 UTC for C:/code/HEAD/inplace\lib\package.conf.d\package.cache Timestamp 2015-04-14 21:31:48 UTC for C:/code/HEAD/inplace\lib\package.conf.d (same as cache) using cache: C:/code/HEAD/inplace\lib\package.conf.d\package.cache db stack: ["C:\\Users\\simonpj\\AppData\\Roaming\\ghc\\i386-mingw32-7.11.20150407\\package.conf.d","C:/code/HEAD/inplace\\lib\\package.conf.d"] modifying: Nothing flag db stack: ["C:\\Users\\simonpj\\AppData\\Roaming\\ghc\\i386-mingw32-7.11.20150407\\package.conf.d","C:/code/HEAD/inplace\\lib\\package.conf.d"] Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\linear-1.18.0.1\html\linear.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\linear-1.18.0.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\lens-4.9\html\lens.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\lens-4.9\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows-ghc-7.11.20150407 \kan-extensions-4.2.1\html\kan-extensions.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\kan-extensions-4.2.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\adjunctions-4.2\html\adjunctions.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\adjunctions-4.2\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\free-4.11\html\free.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\free-4.11\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\profunctors-4.4.1\html\profunctors.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\profunctors-4.4.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\bifunctors-4.2.1\html\bifunctors.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\bifunctors-4.2.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\semigroupoids-4.3\html\semigroupoids.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\semigroupoids-4.3\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\comonad-4.2.5\html\comonad.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\comonad-4.2.5\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\contravariant-1.3.1\html\contravariant.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\contravariant-1.3.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\bytes-0.15\html\bytes.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\bytes-0.15\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\void-0.7\html\void.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\void-0.7\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\semigroups-0.16.2.2\html\semigroups.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\semigroups-0.16.2.2\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows-ghc-7.11.20150407 \unordered-containers-0.2.5.1\html\unordered-containers.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\unordered-containers-0.2.5.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\exceptions-0.8.0.2\html\exceptions.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\exceptions-0.8.0.2\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\distributive-0.4.4\html\distributive.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\distributive-0.4.4\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\hashable-1.2.3.2\html\hashable.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\hashable-1.2.3.2\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\vector-0.10.12.3\html\vector.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\vector-0.10.12.3\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows-ghc-7.11.20150407 \transformers-compat-0.4.0.4\html\transformers-compat.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\transformers-compat-0.4.0.4\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\text-1.2.0.4\html\text.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\text-1.2.0.4\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\tagged-0.8.0.1\html\tagged.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\tagged-0.8.0.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\reflection-1.5.1.2\html\reflection.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\reflection-1.5.1.2\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\primitive-0.6\html\primitive.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\primitive-0.6\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows-ghc-7.11.20150407 \prelude-extras-0.4\html\prelude-extras.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\prelude-extras-0.4\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\nats-1\html\nats.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\nats-1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\mtl-2.2.1\html\mtl.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\mtl-2.2.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\cereal-0.4.1.1\html\cereal.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\cereal-0.4.1.1\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386-windows- ghc-7.11.20150407\StateVar-1.1.0.0\html\StateVar.haddock doesn't exist or isn't a file Warning: haddock-html: C:\Users\simonpj\AppData\Roaming\cabal\doc\i386 -windows-ghc-7.11.20150407\StateVar-1.1.0.0\html doesn't exist or isn't a directory Warning: haddock-interfaces: C:\code\HEAD\libraries\stm\dist- install\doc\html\stm\stm.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\parallel\dist- install\doc\html\parallel\parallel.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\compiler\stage2\doc\html\ghc\ghc.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\haskeline\dist- install\doc\html\haskeline\haskeline.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\transformers\dist- install\doc\html\transformers\transformers.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\hoopl\dist- install\doc\html\hoopl\hoopl.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\bin-package-db\dist- install\doc\html\bin-package-db\bin-package-db.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\Cabal\Cabal\dist- install\doc\html\Cabal\Cabal.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\binary\dist- install\doc\html\binary\binary.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\template-haskell\dist- install\doc\html\template-haskell\template-haskell.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\pretty\dist- install\doc\html\pretty\pretty.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\hpc\dist- install\doc\html\hpc\hpc.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\process\dist- install\doc\html\process\process.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\directory\dist- install\doc\html\directory\directory.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\time\dist- install\doc\html\time\time.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\Win32\dist- install\doc\html\Win32\Win32.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\containers\dist- install\doc\html\containers\containers.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\bytestring\dist- install\doc\html\bytestring\bytestring.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\deepseq\dist- install\doc\html\deepseq\deepseq.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\array\dist- install\doc\html\array\array.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\filepath\dist- install\doc\html\filepath\filepath.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\base\dist- install\doc\html\base\base.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\integer-gmp\dist- install\doc\html\integer-gmp\integer-gmp.haddock doesn't exist or isn't a file Warning: haddock-interfaces: C:\code\HEAD\libraries\ghc-prim\dist- install\doc\html\ghc-prim\ghc-prim.haddock doesn't exist or isn't a file == End post-testsuite package check ------------------------------------------------------------------- Oops! Looks like you have some unexpected test results or framework failures. Please fix them before pushing/sending patches. ------------------------------------------------------------------- HEAD $ }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10305> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10044: Wrong line number reported with CPP and line beginning with #
by GHC 16 Sep '15

16 Sep '15

#10044: Wrong line number reported with CPP and line beginning with # -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.10.1-rc2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- If I compile {{{ {-# LANGUAGE CPP #-} module Bug where {- # hi there! -} * }}} I'm told of a parse error for the `*` on line 10. But that `*` is line 9! The problem is that, with `CPP` on, the line number counter gets confused if a line begins with a #, perhaps after whitespace. I actually hit this and was confused in real code. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10044> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

1 4

[GHC] #9235: Simplifier ticks exhausted on recursive class method
by GHC 16 Sep '15

16 Sep '15

#9235: Simplifier ticks exhausted on recursive class method -----------------------------------+--------------------------------------- Reporter: klao | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time crash Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -----------------------------------+--------------------------------------- GHC 7.8 and HEAD panic on the following code: {{{#!haskell module C where class C a where c :: C a => a -> Int c a = c a {-# INLINE c #-} instance C () x :: Int x = c () }}} Note that it's the coincidence of the 3 conditions that triggers this bug: 1. the `c` method has to be inlined (explicity or implicitly) 2. it has to be recursive (but, it doesn't have to be as dumbly recursive as in the example) 3. it has to have this weird, slightly mistaken type signature: `C a => a -> Int` instead of simply `a -> Int`. But, when this incidentally happens (in my case, both 2. ''and'' 3. were unintentional), the user gets a very hard to debug issue. They don't even get an indication which module is responsible if `c` is used from a different module than the one with the class definition. Also note that this happens even with a non-optimized build. And in this example `c` has to be explicitly marked NOINLINE to prevent it. (In the instance that I caught in the wild simply removing the INLINE annotation was enough.) Finally, on a side note: shouldn't 3. by itself be an error? Or a warning at least? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9235> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

1 2

Re: [GHC] #7057: Simplifier infinite loop regression
by GHC 16 Sep '15

16 Sep '15

#7057: Simplifier infinite loop regression -------------------------------------+------------------------------------- Reporter: ronwalf | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: ⊥ Component: Compiler | Version: 7.4.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * milestone: 8.0.1 => ⊥ Comment: Other instances of this bug: #8833, #3872, #5400, #5448, #5722, #7057, #7369, #9235. All marked with Milestone bottom. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7057#comment:7> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #6047: GHC retains unnecessary binding
by GHC 16 Sep '15

16 Sep '15

#6047: GHC retains unnecessary binding -------------------------------------+------------------------------------- Reporter: simonmar | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.4.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * failure: None/Unknown => Compile-time performance bug -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/6047#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #5959: Top level splice in Template Haskell has over-ambitious lexical scope?
by GHC 16 Sep '15

16 Sep '15

#5959: Top level splice in Template Haskell has over-ambitious lexical scope? -------------------------------------+------------------------------------- Reporter: mightybyte | Owner: Type: bug | Status: new Priority: low | Milestone: 8.0.1 Component: Template Haskell | Version: 7.5 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Incorrect | (amd64) warning at compile-time | Test Case: th/T5971 Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * component: Compiler => Template Haskell Comment: To reproduce: download Lens.hs from comment:3, then run `ghc Main.hs`, with `Main.hs` containing: {{{ {-# LANGUAGE ExistentialQuantification, TemplateHaskell #-} import Lens data App = forall b . App { _auth :: b } makeLens ''App main = return () }}} The error message should be improved, see comment:7. With ghc-7.11.20150909 I get: {{{ The exact Name ‘b_a65q’ is not in scope Probable cause: you used a unique Template Haskell name (NameU), perhaps via newName, but did not bind it If that's it, then -ddump-splices might be useful }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5959#comment:15> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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