[GHC] #14953: Panic when exporting duplicate record fields from separate modules
GHC
ghc-devs at haskell.org
Wed Mar 21 03:17:30 UTC 2018
#14953: Panic when exporting duplicate record fields from separate modules
-------------------------------------+-------------------------------------
Reporter: lyxia | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.5
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Compile-time | Unknown/Multiple
crash or panic | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Description changed by lyxia:
Old description:
> `A.hs`
>
> {{{
> {-# LANGUAGE DuplicateRecordFields #-}
> module A where
> data R = R {unR :: Int}
> }}}
>
> ---
>
> `B.hs`
>
> {{{
> {-# LANGUAGE DuplicateRecordFields #-}
> module B where
> data R = R {unR :: Int}
> }}}
>
> ---
>
> `C.hs`
>
> {{{
> {-# LANGUAGE DuplicateRecordFields #-}
>
> module C (module A, module B) where
>
> import A
> import B
> }}}
>
> ---
>
> Output:
>
> {{{
> C.hs:3:21: error:ghc-stage2: panic! (the 'impossible' happened)
> (GHC version 8.5.20180224 for x86_64-unknown-linux):
> exportClashErr
> $sel:unR:R
> Call stack:
> CallStack (from HasCallStack):
> callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
> ghc:Outputable
> pprPanic, called at compiler/typecheck/TcRnExports.hs:740:22 in
> ghc:TcRnExports
>
> }}}
New description:
`A.hs`
{{{
{-# LANGUAGE DuplicateRecordFields #-}
module A where
data R = R {unR :: Int}
}}}
---
`B.hs`
{{{
{-# LANGUAGE DuplicateRecordFields #-}
module B where
data R = R {unR :: Int}
}}}
---
`C.hs`
{{{
{-# LANGUAGE DuplicateRecordFields #-}
module C (module A, module B) where
import A
import B
}}}
---
Output of `ghc C.hs`:
{{{
C.hs:3:21: error:ghc-stage2: panic! (the 'impossible' happened)
(GHC version 8.5.20180224 for x86_64-unknown-linux):
exportClashErr
$sel:unR:R
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
ghc:Outputable
pprPanic, called at compiler/typecheck/TcRnExports.hs:740:22 in
ghc:TcRnExports
}}}
--
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14953#comment:1>
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