Using example syntax

foo.zig

"self" is 

 struct {
    elems: []T,
    count: usize,
    allocator: *Allocator
 }


without using:

fn ensureCapacity(self: *Self, cap: usize) void {
    if (self.count + cap < self.elems.len) {
        warn("Growing array from {}", self.elems.len);
        var old_elems = self.elems;
        var new_elems = self.allocator.alloc(T, self.elems.len * 2);
        mem.copy(T, new_elems[0..], self.elems[0..]);
        self.elems = new_elems;
        self.allocator.free(elems);
    }
}

with strawman "using" syntax:

fn ensureCapacity(self: *Self, cap: usize) void {
    using self
    if (count + cap < elems.len) {
        warn("Growing array from {}", elems.len);
        var old_elems = elems;
        var new_elems = allocator.alloc(T, elems.len * 2);
        mem.copy(T, new_elems[0..], elems[0..]);
        elems = new_elems;
        allocator.free(elems);
    }
}