Unknown option -XPatternSig used in warning

[Simon Peyton-Jones]

I believe this is a known problem with OPTIONS_GHC, and will work on the command line.  I think Ian is working on it.  Ian?

Simon

| -----Original Message-----
| From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-haskell-users-bounces at haskell.org] On
| Behalf Of Bas van Dijk
| Sent: 19 September 2007 13:20
| To: glasgow-haskell-users at haskell.org
| Subject: Unknown option -XPatternSig used in warning
|
| Hello,
|
| $ ghc --version
| The Glorious Glasgow Haskell Compilation System, version 6.7.20070915
|
|
| When loading the following incorrect program in ghci:
|
| foo (x :: a) = x
|
| ghci rightly complains:
|
| Illegal signature in pattern: a
|         Use -XPatternSigs to permit it
|
| OK so I follow the advice and load:
|
| {-# OPTIONS_GHC -XPatternSigs #-}
|
| foo (x :: a) = x
|
| Now ghci complains:
|
| unknown flags in  {-# OPTIONS #-} pragma: -XPatternSigs     ???
|
| The following works though:
|
| {-# OPTIONS_GHC -fglasgow-exts #-}
|
| foo (x :: a) = x
|
| results in:
|
|  A pattern type signature cannot bind scoped type variables `a'
|       unless the pattern has a rigid type context
|     In the pattern: x :: a
|     In the definition of `foo': foo (x :: a) = x
|
| Which I expect.
|
| Should I file a bug report, or is there an easy fix?
|
| regards,
|
| Bas van Dijk
| _______________________________________________
| Glasgow-haskell-users mailing list
| Glasgow-haskell-users at haskell.org
| http://www.haskell.org/mailman/listinfo/glasgow-haskell-users