b800ce1608
This means that `Fn(&A) -> (&B, &C)` is equivalent to `for<'a> Fn(&'a A) -> (&'a B, &'a C)` similar to the lifetime elision of lower-case `fn` in types and declarations. Closes #18992.
35 lines
1.2 KiB
Rust
35 lines
1.2 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test that the unboxed closure sugar can be used with an arbitrary
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// struct type and that it is equivalent to the same syntax using
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// angle brackets. This test covers only simple types and in
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// particular doesn't test bound regions.
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#![feature(unboxed_closures)]
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#![allow(dead_code)]
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trait Foo<T,U> {
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fn dummy(&self, t: T, u: U);
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}
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trait Eq<Sized? X> for Sized? { }
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impl<Sized? X> Eq<X> for X { }
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fn eq<Sized? A,Sized? B:Eq<A>>() { }
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fn main() {
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eq::< for<'a> Foo<(&'a int,), &'a int>,
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Foo(&int) -> &int >();
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eq::< for<'a> Foo<(&'a int,), (&'a int, &'a int)>,
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Foo(&int) -> (&int, &int) >();
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let _: Foo(&int, &uint) -> &uint; //~ ERROR missing lifetime specifier
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}
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