The guard expression, the bit after the when, should be a boolean expression.
What you probably meant was
1 2 3
match x,y with | x,_ when x <= 0 -> 1 | _ -> 0
Cheers,
Andy.
Thanks. I think "when" must be after every value, but now I realize that "when" relate to all value.
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This expression has type 'a * 'b but is here used with type bool
let test x y = match x, y with | x when x <= 0, _ -> 1 |_,_ -> 0Why?