mirror of https://github.com/rust-lang/rust
127 lines
4.0 KiB
Rust
127 lines
4.0 KiB
Rust
// The purpose of this test is to demonstrate that duplicating object safe traits
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// that are not auto traits is rejected with trait aliases even though one could
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// reasonably accept this.
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#![feature(trait_alias)]
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use std::marker::Unpin;
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// Some arbitrary object-safe trait:
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trait Obj {}
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// Nest a few levels deep:
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trait _0 = Obj;
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trait _1 = _0;
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type _T00 = dyn _0 + _0;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T01 = dyn _1 + _0;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T02 = dyn _1 + _1;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T03 = dyn Obj + _1;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T04 = dyn _1 + Obj;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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// Nest some more and in weird ways:
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trait _2 = _0 + _1;
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trait _3 = Obj;
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trait _4 = _3;
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type _T10 = dyn _2 + _3;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T11 = dyn _3 + _2;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T12 = dyn Obj + _2;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T13 = dyn _2 + Obj;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T14 = dyn _1 + _3;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T15 = dyn _3 + _1;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T16 = dyn _1 + _4;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T17 = dyn _4 + _1;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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// Include auto traits:
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trait _5 = Obj + Send;
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type _T20 = dyn _5 + _5;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T21 = dyn Obj + _5;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T22 = dyn _5 + Obj;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T23 = dyn _5 + Send + Sync + Obj;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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// Also nest:
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trait _6 = _5 + _5; // ==> Obj + Send + Obj + Send
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type _T30 = dyn _6;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T31 = dyn _6 + Send;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T32 = dyn Send + _6;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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// Nest some more:
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trait _7 = _5 + Sync;
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trait _8 = Unpin + _7;
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type _T40 = dyn _8 + Obj;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T41 = dyn Obj + _8;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T42 = dyn _8 + _4;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T43 = dyn _4 + _8;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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type _T44 = dyn _4 + Send + Sync + _8;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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// Take higher ranked types into account.
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// Note that `'a` and `'b` are intentionally different to make sure we consider
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// them semantically the same.
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trait ObjL<'l> {}
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trait _9 = for<'a> ObjL<'a>;
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trait _10 = for<'b> ObjL<'b>;
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type _T50 = dyn _9 + _10;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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trait ObjT<T> {}
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trait _11 = ObjT<for<'a> fn(&'a u8)>;
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trait _12 = ObjT<for<'b> fn(&'b u8)>;
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type _T60 = dyn _11 + _12;
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//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
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fn main() {}
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