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add behavior test: resist alias of explicit copy...

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...of array passed as arg

closes #22906
This commit is contained in:
Andrew Kelley 2025-09-20 18:46:27 -07:00
parent ed7ff0b693
commit 500afbf076
1 changed files with 21 additions and 0 deletions
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21
test/behavior/array.zig
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@ -1125,3 +1125,24 @@ test "splat with an error union or optional result type" {
_ = try S.doTest(@Vector(4, u32));
_ = try S.doTest([4]u32);
}
test "resist alias of explicit copy of array passed as arg" {
const S = struct {
const Thing = [1]u32;
fn destroy_and_replace(box_b: *Thing, a: Thing, box_a: *Thing) void {
box_a.* = undefined;
box_b.* = a;
}
};
var buf_a: S.Thing = .{1234};
var buf_b: S.Thing = .{5678};
const box_a = &buf_a;
const box_b = &buf_b;
const a = box_a.*; // explicit copy
S.destroy_and_replace(box_b, a, box_a);
try expect(buf_b[0] == 1234);
}