syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:     for variant in adt_def.variants() {
context_before:     let mut params_in_repr = DenseBitSet::new_empty(generics.own_params.len());
context_after:         for field in variant.fields.iter() {