syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"ty::Adt(adt_def,"}]}
source_snippet:             ty::Adt(adt_def, args) if adt_def.is_enum() => {
context_before:             }
context_after:                 let (&variant_index, fields) = cv.unwrap_branch().split_first().unwrap();