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32 lines
682 B
Rust
32 lines
682 B
Rust
// run-pass
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// rpass test for reservation impls. Not 100% required because `From` uses them,
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// but still.
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// revisions: old next
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//[next] compile-flags: -Ztrait-solver=next
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#![feature(rustc_attrs)]
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use std::mem;
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trait MyTrait<S> {
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fn foo(&self, s: S) -> usize;
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}
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#[rustc_reservation_impl = "foo"]
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impl<T> MyTrait<u64> for T {
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fn foo(&self, _x: u64) -> usize { 0 }
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}
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// reservation impls don't create coherence conflicts, even with
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// non-chain overlap.
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impl<S> MyTrait<S> for u32 {
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fn foo(&self, _x: S) -> usize { mem::size_of::<S>() }
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}
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fn main() {
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// ...and the non-reservation impl gets picked.XS
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assert_eq!(0u32.foo(0u64), mem::size_of::<u64>());
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}
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