On 20 February 2011 19:56, Mihai Maruseac
Hi,
When running Alex -g I get several warning telling me that a bang pattern is required and that the warning will be an error in GHC 6.14.
As it happens, that is not an error in GHC 7 (see
http://hackage.haskell.org/trac/ghc/ticket/3278):
"""
$ ghci -XMagicHash
GHCi, version 7.0.1.20101215: http://www.haskell.org/ghc/ :? for help
letLoading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... xdone.
Loading package ffi-1.0 ... linking ... done.
Prelude> let x = 2# in 10
<interactive>:1:5:
Warning: Bindings containing unlifted types should use an
outermost bang pattern:
x = 2#
In the expression: let x = 2# in 10
In an equation for `it': it = let x = 2# in 10
<interactive>:1:5:
Warning: Bindings containing unlifted types should use an
outermost bang pattern:
x = 2#
In the expression: let x = 2# in 10
In an equation for `it': it = let x = 2# in 10
10
"""
(I'm not quite sure why I get two identical warnings..)
It looks like Alex has gone back and forth on what to do here. Selected commits:
"""
Fri Nov 26 10:43:42 GMT 2010 Simon Marlow