1 // The purpose of this test is to demonstrate that duplicating object safe traits
2 // that are not auto-traits is rejected even though one could reasonably accept this.
4 // Some arbitrary object-safe trait:
7 // Demonstrate that recursive expansion of trait aliases doesn't affect stable behavior:
8 type _0 = dyn Obj + Obj;
9 //~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
13 type _1 = dyn Send + Obj + Obj;
14 //~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
16 type _2 = dyn Obj + Send + Obj;
17 //~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
19 type _3 = dyn Obj + Send + Send; // But it is OK to duplicate auto traits.
21 // Take higher ranked types into account.
23 // Note that `'a` and `'b` are intentionally different to make sure we consider
24 // them semantically the same.
26 type _4 = dyn for<'a> ObjL<'a> + for<'b> ObjL<'b>;
27 //~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
30 type _5 = dyn ObjT<for<'a> fn(&'a u8)> + ObjT<for<'b> fn(&'b u8)>;
31 //~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]