syntax_data: {"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let fty = tcx.type_of(field.did).instantiate_identity();
context_before:     for field in def.all_fields() {
context_after:         dtorck_constraint_for_ty_inner(tcx, typing_env, span, 0, fty, &mut result);