syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"Adt(def,"}]}
source_snippet:             Adt(def, _) if def.is_enum() => "an",
context_before:             Int(_) | Float(_) | Array(_, _) => "an",
context_after:             // This should never happen, but ICEing and causing the user's code