RULES and -fglasgow-exts

Manuel M. T. Chakravarty
Wed, 03 Jan 2001 17:11:54 +1100

It seems that in order to use RULES pragmas in a module, the
module has to be compiled with -fglasgow-exts (at least,
this is so with 4.08.1).  This is a little surprising as
pragmas usually don't require this flag.  Indeed, it seems
as if the keyword `forall' within a RULES pragma is what
irritates GHC without -fglasgow-exts - maybe because forall
is an extension in "normal" code?