mirror of https://github.com/rust-lang/rust
86 lines
1.4 KiB
Rust
86 lines
1.4 KiB
Rust
//@ check-pass
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// This test checks that trait objects involving trait aliases are well-formed.
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#![feature(trait_alias)]
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trait Obj {}
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trait _0 = Send + Sync;
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// Just auto traits:
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trait _1 = _0 + Send + Sync;
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use std::marker::Unpin;
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fn _f0() {
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let _: Box<dyn _0>;
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let _: Box<dyn _1>;
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let _: Box<dyn Unpin + _1 + Send + Sync>;
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}
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// Include object safe traits:
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fn _f1() {
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let _: Box<dyn Obj + _0>;
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let _: Box<dyn Obj + _1>;
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let _: Box<dyn Obj + _1 + _0>;
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}
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// And when the object safe trait is in a trait alias:
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trait _2 = Obj;
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fn _f2() {
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let _: Box<dyn _2 + _0>;
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let _: Box<dyn _2 + _1>;
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let _: Box<dyn _2 + _1 + _0>;
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}
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// And it should also work when that trait is has auto traits to the right of it.
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trait _3 = Obj + Unpin;
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fn _f3() {
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let _: Box<dyn _3 + _0>;
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let _: Box<dyn _3 + _1>;
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let _: Box<dyn _3 + _1 + _0>;
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}
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// Nest the trait deeply:
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trait _4 = _3;
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trait _5 = _4 + Sync + _0 + Send;
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trait _6 = _5 + Send + _1 + Sync;
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fn _f4() {
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let _: Box<dyn _6 + _0>;
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let _: Box<dyn _6 + _1>;
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let _: Box<dyn _6 + _1 + _0>;
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}
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// Just nest the trait alone:
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trait _7 = _2;
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trait _8 = _7;
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trait _9 = _8;
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fn _f5() {
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let _: Box<dyn _9>;
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}
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// First bound is auto trait:
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trait _10 = Send + Obj;
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trait _11 = Obj + Send;
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trait _12 = Sync + _11;
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trait _13 = Send + _12;
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fn f6() {
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let _: Box<dyn _10>;
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let _: Box<dyn _13>;
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}
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fn main() {}
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