25 lines
581 B
Rust
25 lines
581 B
Rust
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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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fn main() {
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let value = &S { bogus: () };
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f(value);
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}
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