47 lines
710 B
Rust
47 lines
710 B
Rust
// run-pass
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// Tests that everything still compiles and runs fine even when
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// we reorder the bounds.
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trait A {
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fn a(&self) -> usize;
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}
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trait B {
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fn b(&self) -> usize;
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}
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trait C {
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fn combine<T:A+B>(&self, t: &T) -> usize;
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}
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struct Foo;
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impl A for Foo {
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fn a(&self) -> usize { 1 }
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}
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impl B for Foo {
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fn b(&self) -> usize { 2 }
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}
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struct Bar;
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impl C for Bar {
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// Note below: bounds in impl decl are in reverse order.
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fn combine<T:B+A>(&self, t: &T) -> usize {
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(t.a() * 100) + t.b()
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}
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}
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fn use_c<S:C, T:B+A>(s: &S, t: &T) -> usize {
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s.combine(t)
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}
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pub fn main() {
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let foo = Foo;
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let bar = Bar;
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let r = use_c(&bar, &foo);
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assert_eq!(r, 102);
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}
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