36 lines
883 B
Rust
36 lines
883 B
Rust
// Copyright 2017 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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struct Params;
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pub trait Plugin<E: ?Sized> {
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type Error;
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}
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pub trait Pluggable {
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fn get_ref<P: Plugin<Self>>(&mut self) -> Option<P::Error> {
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None
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}
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}
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struct Foo;
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impl Plugin<Foo> for Params {
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type Error = ();
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}
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impl<T: Copy> Pluggable for T {}
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fn handle(req: &mut i32) {
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req.get_ref::<Params>();
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//~^ ERROR the trait bound `Params: Plugin<i32>` is not satisfied
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}
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fn main() {}
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