mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 13:04:42 +00:00
23 lines
426 B
Rust
23 lines
426 B
Rust
#![feature(core_intrinsics, rustc_attrs)]
|
|
|
|
use std::intrinsics::rustc_peek;
|
|
|
|
#[rustc_mir(rustc_peek_liveness, stop_after_dataflow)]
|
|
fn foo() -> Option<i32> {
|
|
let mut x = None;
|
|
|
|
// `x` is live here since it is used in the next statement...
|
|
rustc_peek(x);
|
|
|
|
dbg!(x);
|
|
|
|
// But not here, since it is overwritten below
|
|
rustc_peek(x); //~ ERROR rustc_peek: bit not set
|
|
|
|
x = Some(4);
|
|
|
|
x
|
|
}
|
|
|
|
fn main() {}
|