syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"ty::Adt(def,"}]}
source_snippet:                     ty::Adt(def, _) if def.is_union() => false,
context_before:                 match lhs.ty.kind() {
context_after:                     _ => self.is_known_valid_scrutinee(lhs),