rust/tests/ui/consts/const-fn-zst-args.rs

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// build-pass
// Check that the evaluation of const-functions with
// zero-sized types as arguments compiles successfully
struct Zst {}
const fn foo(val: Zst) -> Zst { val }
const FOO: Zst = foo(Zst {});
fn main() {
const _: Zst = FOO;
}