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//@ needs-sanitizer-support
//@ needs-sanitizer-memory
//
//@ revisions: unoptimized optimized
//
//@ [optimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins -O
//@ [unoptimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins
//
//@ run-pass
//
// This test case intentionally limits the usage of the std,
// since it will be linked with an uninstrumented version of it.
#![feature(core_intrinsics)]
#![feature(start)]
#![allow(invalid_value)]
use std::hint::black_box;
fn calling_black_box_on_zst_ok() {
// It's OK to call black_box on a value of a zero-sized type, even if its
// underlying the memory location is uninitialized. For non-zero-sized types,
// this would be an MSAN error.
let zst = ();
black_box(zst);
}
#[start]
fn main(_: isize, _: *const *const u8) -> isize {
calling_black_box_on_zst_ok();
0
}
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