syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// contents, you need `adt_dtorck_constraint`.
context_before:     /// destructor of `def` itself. For the destructors of the
context_after:     pub fn destructor_constraints(self, def: ty::AdtDef<'tcx>) -> Vec<ty::GenericArg<'tcx>> {