On Tue, 15 Mar 2005, Nicola Whitehead wrote: (snip)
term :: Parser Int term = do f <- factor do symbol "*" e <- expr return (f * t) +++ return f (snip)
symbol and natural are defined elsewhere and work fine, but when I compile it I get the error
ERROR "C:/HUGS/Calculator.hs":66 - Undefined variable "t"
I suspect I'm missing something obvious, but for the life of me I can't see it. Any suggestions? (snip)
You are missing something obvious. (-: "t" appears indeed to be undefined in "term". Did you mean "return (f * e)"? Variables (although why they're called that in Haskell I'm not sure) defined with <- in "do" are only in scope later in that "do", not anywhere else. Mark -- Haskell vacancies in Columbus, Ohio, USA: see http://www.aetion.com/jobs.html