8a461d940c
suggest adding a where-clause when there is an unmet trait-bound that can be satisfied if some type can implement it.
48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
// Copyright 2015 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 types that appear in input types in an object type are
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// subject to the reflect check.
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use std::marker::Reflect;
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use std::io::Write;
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trait Get<T> {
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fn get(self) -> T;
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}
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struct Struct<T>(T);
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fn is_reflect<T:Reflect>() { }
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fn a<T>() {
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is_reflect::<T>(); //~ ERROR E0277
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}
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fn ok_a<T: Reflect>() {
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is_reflect::<T>(); // OK
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}
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fn b<T>() {
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is_reflect::<Box<Get<T>>>(); //~ ERROR E0277
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}
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fn ok_b<T: Reflect>() {
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is_reflect::<Box<Get<T>>>(); // OK
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}
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fn c<T>() {
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is_reflect::<Box<Get<Struct<T>>>>(); //~ ERROR E0277
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}
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fn main() {
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is_reflect::<Box<Get<Struct<()>>>>(); // OK
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}
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