Function region_scope_tree

pub(crate) fn region_scope_tree(tcx: TyCtxt<'_>, def_id: DefId) -> &ScopeTree

Per-body region::ScopeTree. The DefId should be the owner DefId for the body; in the case of closures, this will be redirected to the enclosing function.

Performance: This is a query rather than a simple function to enable re-use in incremental scenarios. We may sometimes need to rerun the type checker even when the HIR hasn’t changed, and in those cases we can avoid reconstructing the region scope tree.