src/test/ui/unsafe/unsafe-fn-used-as-value.rs

// revisions: mir thir
// [thir]compile-flags: -Z thir-unsafeck

unsafe fn f() { return; }

fn main() {
    let x = f;
    x();
    //[mir]~^ ERROR call to unsafe function is unsafe
    //[thir]~^^ ERROR call to unsafe function `f` is unsafe
}