Re: [GHC] #7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs

2012-10-22 Thread GHC 
#7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs
+---
 Reporter:  jeffshaw|  Owner:
 Type:  bug | Status:  new   
 Priority:  normal  |  Component:  Compiler  
  Version:  7.4.2   |   Keywords:
   Os:  Linux   |   Architecture:  x86_64 (amd64)
  Failure:  Compile-time crash  |   Testcase:
Blockedby:  |   Blocking:
  Related:  |  
+---

Comment(by jeffshaw):

 ghc: panic! (the 'impossible' happened)
   (GHC version 7.4.2 for x86_64-unknown-linux):
 compiler/rename/RnSource.lhs:430:14-81: Irrefutable pattern failed
 for pattern Data.Maybe.Just (inst_tyvars,
 _,
 SrcLoc.L _ cls,
 _)


 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 Here is the source code that creates this error:

 instance A a = B a = C a where
   c = a

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7358#comment:1
GHC http://www.haskell.org/ghc/
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Re: [GHC] #7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs

2012-10-22 Thread GHC 
#7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs
+---
 Reporter:  jeffshaw|  Owner:
 Type:  bug | Status:  new   
 Priority:  normal  |  Component:  Compiler  
  Version:  7.4.2   |   Keywords:
   Os:  Linux   |   Architecture:  x86_64 (amd64)
  Failure:  Compile-time crash  |   Testcase:
Blockedby:  |   Blocking:
  Related:  |  
+---

Comment(by jeffshaw):

 More minimal example:

 instance A = A = A where
 a = a

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7358#comment:2
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler

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Re: [GHC] #7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs

2012-10-22 Thread GHC 
#7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs
---+
Reporter:  jeffshaw|Owner:
Type:  bug |   Status:  closed
Priority:  normal  |Component:  Compiler  
 Version:  7.4.2   |   Resolution:  duplicate 
Keywords:  |   Os:  Linux 
Architecture:  x86_64 (amd64)  |  Failure:  Compile-time crash
Testcase:  |Blockedby:
Blocking:  |  Related:
---+
Changes (by michalt):

  * status:  new = closed
  * resolution:  = duplicate


Comment:

 Thanks for reporting.  It seems to be a duplicate of #5951, which is
 already fixed.  With current HEAD you get something like:
 {{{
 [1 of 1] Compiling Test ( Test.hs, Test.o )

 Test.hs:6:10: Malformed instance: A = A = A
 }}}

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7358#comment:3
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler

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Re: [GHC] #7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs

2012-10-22 Thread GHC 
#7358: ghc: panic! (The 'impossible' happened) from RnSource.lhs
---+
Reporter:  jeffshaw|Owner:
Type:  bug |   Status:  closed
Priority:  normal  |Component:  Compiler  
 Version:  7.4.2   |   Resolution:  duplicate 
Keywords:  |   Os:  Linux 
Architecture:  x86_64 (amd64)  |  Failure:  Compile-time crash
Testcase:  |Blockedby:
Blocking:  |  Related:
---+

Comment(by jeffshaw):

 Sorry, I saw 5951, but missed that its version had changed from 7.4.1.
 Thanks!

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7358#comment:4
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler

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