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rust/tests/ui/lint/dead-code/const-underscore-issue-142104.rs

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//@ check-pass
// This test makes sure we always considers `const _` items as live for dead code analysis.
#![deny(dead_code)]
const fn is_nonzero(x: u8) -> bool {
x != 0
}
const _: () = {
assert!(is_nonzero(2));
};
fn main() {}