syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"expanded_consts.push(def_id);"}]}
source_snippet:                     expanded_consts.push(def_id);
context_before:                 PatKind::ExpandedConstant { def_id, subpattern } => {
context_after:                     kind = subpattern.kind;