[GHC] #2310: Panic in ghci 6.8.2 with -fglasgow-exts

[GHC]

#2310: Panic in ghci 6.8.2 with -fglasgow-exts
-----------------------+----------------------------------------------------
    Reporter:  guest   |        Owner:       
        Type:  bug     |       Status:  new  
    Priority:  normal  |    Milestone:       
   Component:  GHCi    |      Version:  6.8.2
    Severity:  normal  |   Resolution:       
    Keywords:          |     Testcase:       
Architecture:  x86     |           Os:  Linux
-----------------------+----------------------------------------------------
Comment (by guest):

 A little bit more info (following the wiki guidelines, although I don't
 know if any of this is useful):

 uname -a
 {{{
 Linux 2.6.24-16-generic #1 SMP Thu Apr 10 13:23:42 UTC 2008 i686 GNU/Linux
 }}}

 gcc -v
 {{{
 Using built-in specs.
 Target: i486-linux-gnu
 Configured with: ../src/configure -v --enable-
 languages=c,c++,fortran,objc,obj-c++,treelang \
   --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib \
   --without-included-gettext --enable-threads=posix --enable-nls \
   --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2
 --enable-clocale=gnu \
   --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-
 targets=all \
   --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
 --target=i486-linux-gnu
 Thread model: posix
 gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)
 }}}

 Adding the "-dcore-line" flags has no effect.

 The problem does not appear without the "-fglasgow-exts" flag:
 {{{
 Prelude> let const :: (forall a. (forall b. a->b)) = \x::a -> (\y -> x) ::
 (forall b. b -> a)

 <interactive>:1:4:
     Illegal signature in pattern: forall a . (forall b . (a -> b))
         Use -XPatternSignatures to permit it

 <interactive>:1:48:
     Illegal signature in pattern: a
         Use -XPatternSignatures to permit it

 <interactive>:1:75:
     Illegal operator `.' in type `forall b . (b -> a)'
       (Use -XTypeOperators to allow operators in types)
 }}}


 'Hope this helps.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2310#comment:1>
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