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rust/tests/ui/lint/unsafe_code/unsafe-extern-blocks.rs

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#![feature(unsafe_extern_blocks)]
#![deny(unsafe_code)]
#[allow(unsafe_code)]
unsafe extern "C" {
fn foo();
}
unsafe extern "C" {
//~^ ERROR usage of an `unsafe extern` block [unsafe_code]
fn bar();
}
fn main() {}