Type context book-keeping.
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).
An entry in an interner.
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
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
This can be done, for example, for
by looking them up in their respective interners.
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
would result in lookup errors, or worse, in silently wrong data being