On 02/01/2014, at 1:24 PM, srean wrote:
>
> A:> So could you add some info there, given that it is such a key feature of
> Felix in widespread use. I dont know enough of what Felix can and cannot
> pattern match on. So its beyond my ability to document it.
Any literal of a type with an equality operator.
You cannot match on expressions directly, so this is NOT allowed:
var y = 42;
match x with
| y => ...
you have to do this instead:
match x with
| ?v when v == y => ...
but there's a shorthand for that:
match x with
| $(v) => ...
More generally, matching "match" type constructors. Literals are a special
kind of type constructor with no arguments, or, if you prefer with themselves
as the argument of a type specific constructor.
--
john skaller
[email protected]
http://felix-lang.org
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