9b9ef44233
RFC #27. After a snapshot, the old syntax will be removed. This can break some code that looked like `foo as &Trait:Send`. Now you will need to write `foo as (&Trait+Send)`. Closes #12778. [breaking-change]
61 lines
2.2 KiB
Rust
61 lines
2.2 KiB
Rust
// Copyright 2012 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 which of the builtin types are considered sendable.
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fn assert_send<T:Send>() { }
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trait Dummy { }
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fn test<'a,T,U:Send>(_: &'a int) {
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// lifetime pointers with 'static lifetime are ok
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assert_send::<&'static int>();
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assert_send::<&'static str>();
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assert_send::<&'static [int]>();
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// whether or not they are mutable
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assert_send::<&'static mut int>();
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// otherwise lifetime pointers are not ok
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assert_send::<&'a int>(); //~ ERROR does not fulfill `Send`
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assert_send::<&'a str>(); //~ ERROR does not fulfill `Send`
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assert_send::<&'a [int]>(); //~ ERROR does not fulfill `Send`
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// boxes are ok
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assert_send::<Box<int>>();
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assert_send::<String>();
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assert_send::<Vec<int> >();
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// but not if they own a bad thing
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assert_send::<Box<&'a int>>(); //~ ERROR does not fulfill `Send`
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// careful with object types, who knows what they close over...
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assert_send::<&'static Dummy>(); //~ ERROR does not fulfill `Send`
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assert_send::<&'a Dummy>(); //~ ERROR does not fulfill `Send`
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assert_send::<&'a Dummy+Send>(); //~ ERROR does not fulfill `Send`
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assert_send::<Box<Dummy+>>(); //~ ERROR does not fulfill `Send`
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// ...unless they are properly bounded
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assert_send::<&'static Dummy+Send>();
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assert_send::<Box<Dummy+Send>>();
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// but closure and object types can have lifetime bounds which make
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// them not ok (FIXME #5121)
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// assert_send::<proc:'a()>(); // ERROR does not fulfill `Send`
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// assert_send::<Box<Dummy+'a>>(); // ERROR does not fulfill `Send`
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// unsafe ptrs are ok unless they point at unsendable things
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assert_send::<*int>();
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assert_send::<*&'a int>(); //~ ERROR does not fulfill `Send`
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}
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fn main() {
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}
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