[GHC] #14128: Possible bug in Renamer when dealing with orphans
GHC
ghc-devs at haskell.org
Wed Aug 16 12:06:21 UTC 2017
#14128: Possible bug in Renamer when dealing with orphans
-------------------------------------+-------------------------------------
Reporter: Shayan-Najd | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.2.1
(Type checker) |
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:
-------------------------------------+-------------------------------------
In a [https://github.com/shayan-najd/GrowableGHC branch] of GHC with
[https://ghc.haskell.org/trac/ghc/wiki/ImplementingTreesThatGrow Growable
ASTs], the code compiles with `devel2` configuration, but fails with
`./validate`. It passes all the test cases, except two that already fail
in HEAD (see [https://ghc.haskell.org/trac/ghc/ticket/14126 #14126]).
Especifically, the compiler returns the following error:
{{{
ghc-stage1: panic! (the 'impossible' happened)
(GHC version 8.3.20170806 for x86_64-unknown-linux):
ASSERT failed!
HsPat [GHC.Base, GHC.Float, Data.Binary.Generic,
Data.ByteString.Builder, HsBinds, HsDoc, HsExpr, HsLit, HsPat,
HsTypes, PprCore, GHC.LanguageExtensions,
Data.Time.Calendar.Gregorian, Data.Time.Format.Parse,
Data.Time.LocalTime.Internal.LocalTime,
Data.Time.LocalTime.Internal.ZonedTime]
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at
compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1188:22 in
ghc:Outputable
assertPprPanic, called at compiler/rename/RnNames.hs:364:99 in
ghc:RnNames
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at
compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in
ghc:Outputable
pprPanic, called at compiler/utils/Outputable.hs:1186:5 in
ghc:Outputable
assertPprPanic, called at compiler/rename/RnNames.hs:364:99 in
ghc:RnNames
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
I suspect (as hinted above) it has to do with a bug in the renamer when
dealing with orphan instances (and probably in conjunction with boot
files).
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14128>
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