1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // General test of maybe_uninits state computed by MIR dataflow.
14 #![feature(core_intrinsics, rustc_attrs)]
16 use std::intrinsics::rustc_peek;
17 use std::mem::{drop, replace};
21 #[rustc_mir(rustc_peek_maybe_uninit,stop_after_dataflow)]
23 // `x` is initialized here, so maybe-uninit bit is 0.
25 unsafe { rustc_peek(&x) }; //~ ERROR rustc_peek: bit not set
29 // `x` definitely uninitialized here, so maybe-uninit bit is 1.
30 unsafe { rustc_peek(&x) };