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// Copyright 2017 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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// Test for RFC 1268: we allow overlapping impls of marker traits, | ||
// that is, traits without items. In this case, a type `T` is | ||
// `MyMarker` if it is either `Debug` or `Display`. This test just | ||
// checks that we don't consider **all** types to be `MyMarker`. See | ||
// also the companion test in | ||
// `run-pass/overlap-permitted-for-marker-traits.rs`. | ||
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#![feature(overlapping_marker_traits)] | ||
#![feature(optin_builtin_traits)] | ||
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use std::fmt::{Debug, Display}; | ||
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trait Marker {} | ||
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impl<T: Debug> Marker for T {} | ||
impl<T: Display> Marker for T {} | ||
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fn is_marker<T: Marker>() { } | ||
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struct NotDebugOrDisplay; | ||
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fn main() { | ||
// Debug && Display: | ||
is_marker::<i32>(); | ||
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// Debug && !Display: | ||
is_marker::<Vec<i32>>(); | ||
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// !Debug && !Display | ||
is_marker::<NotDebugOrDisplay>(); //~ ERROR | ||
} |
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src/test/run-pass/overlap-permitted-for-marker-traits-neg.rs
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// Copyright 2017 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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#![feature(overlapping_marker_traits)] | ||
#![feature(optin_builtin_traits)] | ||
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// Overlapping negative impls for `MyStruct` are permitted: | ||
struct MyStruct; | ||
impl !Send for MyStruct {} | ||
impl !Send for MyStruct {} | ||
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fn main() { | ||
} |
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