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// Tests that type assignability is used to search for instances when
// making method calls, but only if there aren't any matches without
// it.
iface iterable<A> {
fn iterate(blk: fn(A) -> bool);
}
impl vec/&<A> of iterable<A> for &[const A] {
fn iterate(f: fn(A) -> bool) {
vec::each(self, f);
}
}
impl vec<A> of iterable<A> for ~[const A] {
fn iterate(f: fn(A) -> bool) {
vec::each(self, f);
}
}
fn length<A, T: iterable<A>>(x: T) -> uint {
let mut len = 0;
for x.iterate() |_y| { len += 1 }
ret len;
}
fn main() {
let x = ~[0,1,2,3];
// Call a method
for x.iterate() |y| { assert x[y] == y; }
// Call a parameterized function
assert length(x) == vec::len(x);
// Call a parameterized function, with type arguments that require
// a borrow
assert length::<int, &[int]>(x) == vec::len(x);
// Now try it with a type that *needs* to be borrowed
let z = [0,1,2,3]/_;
// Call a method
for z.iterate() |y| { assert z[y] == y; }
// Call a parameterized function
assert length::<int, &[int]>(z) == vec::len(z);
}
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