one of the recent changes with box is that it does placement new. So
generally, this is bad:
fn foo(x: int) -> Box<int> {
box (x + 1)
}
let y = foo(5);
Because it forces your caller to use a Box. Instead...
fn foo(x: int) -> int {
x + 1
}
Because then your caller can choose:
let y = foo(5);
for a copy, and
let y = box foo(5);
for a boxed value. Or, in the future....
let y = box(GC) foo(5);
At least, that's my current understanding.
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