Zachary S c3205f98dd Replace #[rustc_do_not_implement_via_object] with #[rustc_dyn_incompatible_trait], which makes the marked trait dyn-incompatible. ... Removes the attribute from `MetaSized` and `PointeeSized`, with a special case in the trait solvers for `MetaSized`. `dyn MetaSized` is a perfectly cromulent type, and seems to only have had #[rustc_do_not_implement_via_object] so the builtin object candidate does not overlap with the builtin MetaSized impl that all `dyn` types get. Resolves this with a special case by checking `is_sizedness_trait` where the trait solvers previously checked `implement_via_object`. `dyn PointeeSized` alone is rejected for other reasons (since `dyn PointeeSized` is considered to have no principal trait because `PointeeSized` is removed at an earlier stage of the compiler), but `(dyn PointeeSized + Send)` is valid and equivalent to `dyn Send`. Add suggestions from code review Update compiler/rustc_trait_selection/src/traits/dyn_compatibility.rs and tests Co-authored-by: lcnr <rust@lcnr.de>		2026-01-20 12:54:40 -06:00
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src	Replace #[rustc_do_not_implement_via_object] with #[rustc_dyn_incompatible_trait], which makes the marked trait dyn-incompatible.	2026-01-20 12:54:40 -06:00
Cargo.toml	remove rustc_attr_data_structures	2025-07-31 14:19:27 +02:00