According to the Haskell 98 report, patterns have the following grammar:
apat ::= var [ @ apat ]
| ~ apat
| ...etc...
Thus the following program should be legal (IMHO):
main = let foo@~(x,y) = (1,2)
in print foo
Instead, both Hugs and GHC report
ERROR "TestAsPat.hs" (line 1): Undefined variable "foo"
What have I missed?
Replacing the lhs with foo@(~(x,y)) works, BTW.
Thanks..
--KW 8-)
--
: Keith Wansbrough, MSc, BSc(Hons) (Auckland) ------------------------:
: PhD Student, Computer Laboratory, University of Cambridge, England. :
: (and recently of the University of Glasgow, Scotland. [><] ) :
: Native of Antipodean Auckland, New Zealand: 174d47' E, 36d55' S. :
: http://www.cl.cam.ac.uk/users/kw217/ mailto:[EMAIL PROTECTED] :
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