syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:             for variant in tcx.adt_def(def_id).variants() {
context_before:         DefKind::Struct | DefKind::Union | DefKind::Enum => {
context_after:                 for field in variant.fields.iter() {