Expand description

Type context book-keeping.




A type that is not publicly constructable. This prevents people from making TyKind::Errors except through the error-reporting functions on a tcx.

Whenever a value may be live across a generator yield, the type of that value winds up in the GeneratorInteriorTypeCause struct. This struct adds additional information about such captured types that can be useful for diagnostics. In particular, it stores the span that caused a given type to be recorded, along with the scope that enclosed the value (which can be used to find the await that the value is live across).

The central data structure of the compiler. It stores references to the various arenas and also houses the results of the various compiler queries that have been performed. See the rustc dev guide for more details.


A user-given type annotation attached to a constant. These arise from constants that are named via paths, like Foo::<A>::new and so forth.



A trait implemented for all X<'a> types that can be safely and efficiently converted to X<'tcx> as long as they are part of the provided TyCtxt<'tcx>. This can be done, for example, for Ty<'tcx> or SubstsRef<'tcx> by looking them up in their respective interners.


ptr_eq 🔒

Validate that the given HirId (respectively its local_id part) can be safely used as a key in the maps of a TypeckResults. For that to be the case, the HirId must have the same owner as all the other IDs in this table (signified by hir_owner). Otherwise the HirId would be in a different frame of reference and using its local_id would result in lookup errors, or worse, in silently wrong data being stored/returned.

Type Definitions

Canonicalized user type annotation.

Mapping of type annotation indices to canonical user type annotations.