Forbid generic parameters in types of #[type_const] items
fixesrust-lang/rust#150614
we enforce the same restriction on `#[type_const]` const items that already exists for const generic parameters - when `generic_const_parameter_types` feature gate is not enabled, the type of a `#[type_const]` item cannot reference generic parameters. implementation follows the same pattern used for const generic parameters. we check if the item has the `#[type_const]` attribute and if the feature gate is disabled, then we apply `RibKind::ConstParamTy` restrictions when visiting the type, which prevents the use of generic parameters.
check is added in three places:
- Free const items (`ItemKind::Const`)
- Trait associated consts (`AssocItemKind::Const` in traits)
- Impl associated consts (`AssocItemKind::Const` in impls)
added tests for new feature, hope i get this task right :>
r? `@BoxyUwU`
05dce482d3