src/test/compile-fail/unsafe-subtyping.rs


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// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// Check that safe fns are not a subtype of unsafe fns.

fn foo(x: Option<fn(i32)>) -> Option<unsafe fn(i32)> {
    x //~ ERROR mismatched types
}

fn bar(x: fn(i32)) -> unsafe fn(i32) {
    x // OK, coercion!
}

fn main() { }