rust/tests/ui/parser/no-const-fn-in-extern-block.rs

extern "C" {
    const fn foo();
    //~^ ERROR functions in `extern` blocks cannot have qualifiers
    const unsafe fn bar();
    //~^ ERROR functions in `extern` blocks cannot have qualifiers
    //~| ERROR items in unadorned `extern` blocks cannot have safety qualifiers
}

fn main() {}