Module rustc_hir_analysis::check::wfcheck

Structs

GATSubstCollector 🔒

TypeVisitor that looks for uses of GATs like <P0 as Trait<P1..Pn>>::GAT<Pn..Pm> and adds the arguments P0..Pm into the two vectors, regions and types (depending on their kind). For each parameter Pi also track the index i.

WfCheckingCtxt 🔒

Constants

HELP_FOR_SELF_TYPE 🔒

Functions

augment_param_env 🔒

Add a new set of predicates to the caller_bounds of an existing param_env.

check_associated_item 🔒

check_associated_type_bounds 🔒

Checks all associated type defaults of trait trait_def_id.

check_fn_or_method 🔒

check_foreign_item 🔒

check_gat_where_clauses 🔒

Require that the user writes where clauses on GATs for the implicit outlives bounds involving trait parameters in trait functions and lifetimes passed as GAT substs. See self-outlives-lint test.

check_impl 🔒

check_impl_item 🔒

check_item 🔒

Checks that the field types (in a struct def’n) or argument types (in an enum def’n) are well-formed, meaning that they do not require any constraints not declared in the struct definition itself. For example, this definition would be illegal:

check_item_fn 🔒

check_item_type 🔒

check_method_receiver 🔒

check_mod_type_wf 🔒

check_object_unsafe_self_trait_by_name 🔒

Detect when an object unsafe trait is referring to itself in one of its associated items. When this is done, suggest using Self instead.

check_param_wf 🔒

check_return_position_impl_trait_in_trait_bounds 🔒

Basically check_associated_type_bounds, but separated for now and should be deduplicated when RPITITs get lowered into real associated items.

check_trait 🔒

check_trait_item 🔒

check_type_defn 🔒

In a type definition, we check that to ensure that the types of the fields are well-formed.

check_variances_for_type_defn 🔒

check_well_formed 🔒

check_where_clauses 🔒

Checks where-clauses and inline bounds that are declared on def_id.

could_be_self 🔒

e0307 🔒

enter_wf_checking_ctxt 🔒

error_392 🔒

gather_gat_bounds 🔒

We use the following trait as an example throughout this function. Specifically, let’s assume that to_check here is the return type of into_iter, and the GAT we are checking this for is Iter.

item_adt_kind 🔒

provide

receiver_is_implemented 🔒

receiver_is_valid 🔒

Returns whether receiver_ty would be considered a valid receiver type for self_ty. If arbitrary_self_types is enabled, receiver_ty must transitively deref to self_ty, possibly through a *const/mut T raw pointer. If the feature is not enabled, the requirements are more strict: receiver_ty must implement Receiver and directly implement Deref<Target = self_ty>.

region_known_to_outlive 🔒

Given a known param_env and a set of well formed types, can we prove that region_a outlives region_b

report_bivariance 🔒

resolve_regions_with_wf_tys 🔒

Given a known param_env and a set of well formed types, set up an InferCtxt, call the passed function (to e.g. set up region constraints to be tested), then resolve region and return errors

ty_known_to_outlive 🔒

Given a known param_env and a set of well formed types, can we prove that ty outlives region.