rust/src/test/mir-opt/retain-never-const.rs

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// Regression test for #66975 - ensure that we don't keep unevaluated
// `!`-typed constants until codegen.
// Force generation of optimized mir for functions that do not reach codegen.
// compile-flags: --emit mir,link
#![feature(const_panic)]
struct PrintName<T>(T);
impl<T> PrintName<T> {
const VOID: ! = panic!();
}
fn no_codegen<T>() {
let _ = PrintName::<T>::VOID;
}
fn main() {}
// END RUST SOURCE
// START rustc.no_codegen.PreCodegen.after.mir
// bb0: {
// StorageLive(_1);
// _1 = const PrintName::<T>::VOID;
// unreachable;
// }
// END rustc.no_codegen.PreCodegen.after.mir