31 lines
1000 B
Rust
31 lines
1000 B
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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// Tests that impl methods are matched to traits exactly:
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// we might be tempted to think matching is contravariant, but if
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// we let an impl method can have more permissive bounds than the trait
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// method it's implementing, the return type might be less specific than
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// needed. Just punt and make it invariant.
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use iter::BaseIter;
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trait A {
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fn b<C:Copy Const, D>(x: C) -> C;
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}
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struct E {
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f: int
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}
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impl E: A {
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fn b<F:Copy, G>(_x: F) -> F { die!() } //~ ERROR in method `b`, type parameter 0 has 1 bound, but
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}
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fn main() {}
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