| // Regression test for <https://github.com/rust-lang/rust/issues/113840> |
| // |
| // This test makes sure that multiple marker (method-less) traits can reuse the |
| // same pointer for upcasting. |
| // |
| //@ build-fail |
| #![crate_type = "lib"] |
| #![feature(rustc_attrs)] |
| |
| // Markers |
| trait M0 {} |
| trait M1 {} |
| trait M2 {} |
| |
| // Just a trait with a method |
| trait T { |
| fn method(&self) {} |
| } |
| |
| #[rustc_dump_vtable] |
| trait A: M0 + M1 + M2 + T {} //~ error: vtable entries for `<S as A>`: |
| |
| #[rustc_dump_vtable] |
| trait B: M0 + M1 + T + M2 {} //~ error: vtable entries for `<S as B>`: |
| |
| #[rustc_dump_vtable] |
| trait C: M0 + T + M1 + M2 {} //~ error: vtable entries for `<S as C>`: |
| |
| #[rustc_dump_vtable] |
| trait D: T + M0 + M1 + M2 {} //~ error: vtable entries for `<S as D>`: |
| |
| struct S; |
| |
| impl M0 for S {} |
| impl M1 for S {} |
| impl M2 for S {} |
| impl T for S {} |
| impl A for S {} |
| impl B for S {} |
| impl C for S {} |
| impl D for S {} |
| |
| pub fn require_vtables() { |
| fn require_vtables(_: &dyn A, _: &dyn B, _: &dyn C, _: &dyn D) {} |
| |
| require_vtables(&S, &S, &S, &S) |
| } |
