Function rustc_hir_analysis::check::dropck::check_drop_impl
source · pub fn check_drop_impl(
tcx: TyCtxt<'_>,
drop_impl_did: DefId
) -> Result<(), ErrorGuaranteed>
Expand description
This function confirms that the Drop
implementation identified by
drop_impl_did
is not any more specialized than the type it is
attached to (Issue #8142).
This means:
-
The self type must be nominal (this is already checked during coherence),
-
The generic region/type parameters of the impl’s self type must all be parameters of the Drop impl itself (i.e., no specialization like
impl Drop for Foo<i32>
), and, -
Any bounds on the generic parameters must be reflected in the struct/enum definition for the nominal type itself (i.e. cannot do
struct S<T>; impl<T:Clone> Drop for S<T> { ... }
).