A question / proposed syntax... How about allowing writing something like:
if (Some(foo), Some(bar)) ~~ (get_option("foo"), get_option("bar)) {
use(foo, bar);
}
Instead of having to write the more combersome:
match (get_option("foo"), get_option("bar")) {
(Some(foo), Some(bar)) => {
use(foo, bar);
},
_otherwise => {},
}
Not to mention:
let foo_bar: bool = (Some(_foo), Some(_bar)) ~~ (get_option("foo"),
get_option("bar"));
match (get_option("foo"), get_option("bar")) {
(Some(foo), Some(bar)) => {
use(foo, bar);
},
_otherwise => {},
}
Instead of the very cumbersome:
let foo_bar: bool =
match (get_option("foo"), get_option("bar")) {
(Some(_foo), Some(_bar)) => true,
_otherwise => false,
}
}
So, in general allow `pattern ~~ expression` to be a boolean expression and
if it is used in an "if" statement allow it to introduce the matched
variables to the "then" scope.
The operator doesn't have to be ~~, it could be anything unique (though
using ~ for matching has a lot of precedence in other languages).
Thoughts?
Oren Ben-Kiki
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