35 lines
1.0 KiB
Rust
35 lines
1.0 KiB
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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// B and C both require A, so D does as well, twice, but that's just fine
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trait A { fn a(&self) -> int; }
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trait B: A { fn b(&self) -> int; }
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trait C: A { fn c(&self) -> int; }
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trait D: B C { fn d(&self) -> int; }
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struct S { bogus: () }
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impl S: A { fn a(&self) -> int { 10 } }
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impl S: B { fn b(&self) -> int { 20 } }
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impl S: C { fn c(&self) -> int { 30 } }
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impl S: D { fn d(&self) -> int { 40 } }
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fn f<T: D>(x: &T) {
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assert x.a() == 10;
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assert x.b() == 20;
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assert x.c() == 30;
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assert x.d() == 40;
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}
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pub fn main() {
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let value = &S { bogus: () };
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f(value);
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} |