48 lines
1019 B
Rust
48 lines
1019 B
Rust
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// Regression test for <https://github.com/rust-lang/rust/issues/113840>
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//
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// This test makes sure that multiple marker (method-less) traits can reuse the
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// same pointer for upcasting.
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//
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// build-fail
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#![crate_type = "lib"]
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#![feature(rustc_attrs)]
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// Markers
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trait M0 {}
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trait M1 {}
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trait M2 {}
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// Just a trait with a method
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trait T {
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fn method(&self) {}
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}
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#[rustc_dump_vtable]
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trait A: M0 + M1 + M2 + T {} //~ error: vtable entries for `<S as A>`:
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#[rustc_dump_vtable]
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trait B: M0 + M1 + T + M2 {} //~ error: vtable entries for `<S as B>`:
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#[rustc_dump_vtable]
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trait C: M0 + T + M1 + M2 {} //~ error: vtable entries for `<S as C>`:
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#[rustc_dump_vtable]
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trait D: T + M0 + M1 + M2 {} //~ error: vtable entries for `<S as D>`:
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struct S;
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impl M0 for S {}
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impl M1 for S {}
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impl M2 for S {}
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impl T for S {}
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impl A for S {}
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impl B for S {}
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impl C for S {}
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impl D for S {}
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pub fn require_vtables() {
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fn require_vtables(_: &dyn A, _: &dyn B, _: &dyn C, _: &dyn D) {}
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require_vtables(&S, &S, &S, &S)
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}
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