A minor problem I ran into while playing around with the testing of the
stdlib. I'd like to be able to insert debugging code into a pattern
match, but in order to do that, I have to make everything into an
anonymous function. I wish I could do something like this:
fun map[T,U] (f:T->U) (x:list[T]) =>
match x with
| Empty[T] => Empty[U]
| Cons(?h, ?t) =>
print "hello"; endl;
Cons(_f h, map f x)
endmatch
;
We talked about something like this about a month ago, but I never
thought about using it like this. I have no idea if this is possible,
but it seems like it could be, since there's some clear terminals for
this expression: the "|" and the "endmatch". Can the LALR parser handle
this, and would it really complicate the parser to allow the semi-colon
to act as a multiple statements->expression meta-function inside an
expression?
So, in summation, someone please tell me why this is a bad idea :)
-e
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