syntax_data: {"ast_node_type":"variable","tokens":[{"end":22,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let adt_has_dtor =
context_before:     // needs drop.
context_after:         |adt_def: ty::AdtDef<'tcx>| adt_def.destructor(tcx).map(|_| DtorType::Significant);