syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:                     for subty in tcx.adt_drop_tys(adt_id.did())? {
context_before:                 ty::Adt(adt_id, args) => {
context_after:                         vec.push(EarlyBinder::bind(subty).instantiate(tcx, args));