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098c659276
Fixes #55321 When AutoTraitFinder begins examining a type, it checks for an explicit negative impl. However, it wasn't checking for negative impls found when calling 'select' on predicates found from nested obligations. This commit makes AutoTraitFinder check for negative impls whenever it makes a call to 'select'. If a negative impl is found, it immediately bails out. Normal users of SelectioContext don't need to worry about this, since they stop as soon as an Unimplemented error is encountered. However, we add predicates to our ParamEnv when we encounter this error, so we need to handle negative impls specially (so that we don't try adding them to our ParamEnv).
28 lines
1.0 KiB
Rust
28 lines
1.0 KiB
Rust
// Copyright 2018 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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#![feature(optin_builtin_traits)]
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// @has issue_55321/struct.A.html
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// @has - '//*[@id="implementations-list"]/*[@class="impl"]//*/code' "impl !Send for A"
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// @has - '//*[@id="implementations-list"]/*[@class="impl"]//*/code' "impl !Sync for A"
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pub struct A();
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impl !Send for A {}
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impl !Sync for A {}
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// @has issue_55321/struct.B.html
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// @has - '//*[@id="synthetic-implementations-list"]/*[@class="impl"]//*/code' "impl<T> !Send for \
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// B<T>"
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// @has - '//*[@id="synthetic-implementations-list"]/*[@class="impl"]//*/code' "impl<T> !Sync for \
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// B<T>"
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pub struct B<T: ?Sized>(A, Box<T>);
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