rust/src/test/compile-fail/regions-fn-subtyping.rs

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// Copyright 2012 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.
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fn of<T>() -> &fn(T) { fail2!(); }
fn subtype<T>(x: &fn(T)) { fail2!(); }
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fn test_fn<'x,'y,'z,T>(_x: &'x T, _y: &'y T, _z: &'z T) {
// Here, x, y, and z are free. Other letters
// are bound. Note that the arrangement
// subtype::<T1>(of::<T2>()) will typecheck
// iff T1 <: T2.
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subtype::<&fn<'a>(&'a T)>(
of::<&fn<'a>(&'a T)>());
subtype::<&fn<'a>(&'a T)>(
of::<&fn<'b>(&'b T)>());
subtype::<&fn<'b>(&'b T)>(
of::<&fn<'x>(&'x T)>());
subtype::<&fn<'x>(&'x T)>(
of::<&fn<'b>(&'b T)>()); //~ ERROR mismatched types
subtype::<&fn<'a,'b>(&'a T, &'b T)>(
of::<&fn<'a>(&'a T, &'a T)>());
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subtype::<&fn<'a>(&'a T, &'a T)>(
of::<&fn<'a,'b>(&'a T, &'b T)>()); //~ ERROR mismatched types
subtype::<&fn<'a,'b>(&'a T, &'b T)>(
of::<&fn<'x,'y>(&'x T, &'y T)>());
subtype::<&fn<'x,'y>(&'x T, &'y T)>(
of::<&fn<'a,'b>(&'a T, &'b T)>()); //~ ERROR mismatched types
}
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fn main() {}