AsyncDrop trait without sync Drop generates an error When type implements `AsyncDrop` trait, it must also implement sync `Drop` trait to be used in sync context and unwinds. This PR adds error generation in such a case. Fixes: rust-lang/rust#140696
AsyncDrop trait without sync Drop generates an error When type implements `AsyncDrop` trait, it must also implement sync `Drop` trait to be used in sync context and unwinds. This PR adds error generation in such a case. Fixes: rust-lang/rust#140696