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
-users@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
On 9/19/07, Simon Peyton-Jones [EMAIL PROTECTED] wrote:
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?
Via the command line I get the same problem:
$ ghci -XPatternSigs PatternSig.hs
GHCi, version 6.7.20070915:
| Illegal signature in pattern: a
| Use -XPatternSigs to permit it
|
I am very happy to see
that it doesn't recommend -fglasgow-exts anymore!
However, I still would prefer
Use LANGUAGE pragma with extension ``PatternSigs'' to permit it
since it points out even more
Via the command line I get the same problem:
$ ghci -XPatternSigs PatternSig.hs
GHCi, version 6.7.20070915: http://www.haskell.org/ghc/ :? for help
ghc-6.7.20070915: unrecognised flags: -XPatternSigs
Usage: For basic information, try the `--help' option.
$
On 9/19/07, Simon Peyton-Jones [EMAIL PROTECTED] wrote:
...I'll push a fix.
Thanks! It works now:
$ ghci -XPatternSignatures PatternSig.hs
GHCi, version 6.9.20070919: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
[1 of 1] Compiling Main (
On 9/19/07, Wolfgang Jeltsch [EMAIL PROTECTED] wrote:
You should use {-# LANGUAGE PatternSigs #-}
That should be: {-# LANGUAGE PatternSignatures #-}
It would indeed be better if GHC could print Use LANGUAGE pragma with
extension... like Wolfram mentioned.
Bas
Hi Wolfram,
On Wed, Sep 19, 2007 at 01:45:00PM -, [EMAIL PROTECTED] wrote:
By the way, some of my LANGUAGE pragmas are getting quite long,
and last time I tried I was not allowed to have a line break in there.
What version of GHC are you using? This works in 6.6:
{-# LANGUAGE
