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Detect object safety errors when assoc type is missing

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When an associated type with GATs isn't specified in a `dyn Trait`, emit
an object safety error instead of only complaining about the missing
associated type, as it will lead the user down a path of three different
errors before letting them know that what they were trying to do is
impossible to begin with.

Fix #103155.
This commit is contained in:
Esteban Küber
2023-10-04 01:10:51 +00:00
parent 6d1fc53cf4
commit 17a6ae2df3
36 changed files with 223 additions and 194 deletions
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2
compiler/rustc_trait_selection/src/traits/mod.rs
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@@ -47,7 +47,7 @@ pub use self::engine::{ObligationCtxt, TraitEngineExt};
pub use self::fulfill::{FulfillmentContext, PendingPredicateObligation};
pub use self::object_safety::astconv_object_safety_violations;
pub use self::object_safety::is_vtable_safe_method;
pub use self::object_safety::MethodViolationCode;
pub use self::object_safety::object_safety_violations_for_assoc_item;
pub use self::object_safety::ObjectSafetyViolation;
pub use self::project::NormalizeExt;
pub use self::project::{normalize_inherent_projection, normalize_projection_type};