Add array! macro for non-copy types

[Nokel81]

Fixes: #32

[sugar700]

This is unsound. Consider what happens if break is used as an expression. Also, this should be using $crate:: to avoid risk of referring to wrong std.

[oaleaf]

Suggested change

	for i in 0..$count {
	res[i] = ::std::mem::MaybeUninit::new($value);
	}
	for elem in &mut res[..] {
	elem.write($value);
	}

A little cleaner, taken from https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#initializing-an-array-element-by-element

[oaleaf]

Consider what happens if break is used as an expression.

There is no break, is there?

The only issue would be a potential panic! in the body of the loop and the already initialized elements not getting dropped, leading to a memory leak

[sugar700]

Consider what happens if break is used as an expression.

There is no break, is there?

The only issue would be a potential panic! in the body of the loop and the already initialized elements not getting dropped, leading to a memory leak

Well, the user could provide break as an expression, and that would escape the loop early.

[oaleaf]

Oh I see what you mean now.

Maybe moving the expression to a variable outside the loop and cloning it for every element would be better in that regard?