syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"false"}]}
source_snippet:                     false // No need to dig further.
context_before:                     lint.matches_no_values_ty = ty;
context_after:                 } else if matches!(subpat.ctor(), Constructor::Ref | Constructor::UnionField) {