rust/tests/ui/extern/extern-const.rs

25 lines
692 B
Rust

// Check extern items cannot be const + `rustfix` suggests using
// extern static.
//
// #54388: an unused reference to an undefined static may or may not
// compile. To sidestep this by using one that *is* defined.
//@ run-rustfix
//@ compile-flags: -g
use std::ffi::c_int;
#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
const rust_dbg_static_mut: c_int; //~ ERROR extern items cannot be `const`
}
fn main() {
// We suggest turning the (illegal) extern `const` into an extern `static`,
// but this also requires `unsafe` (a deny-by-default lint at comment time,
// future error; Issue #36247)
unsafe {
let _x = rust_dbg_static_mut;
}
}