syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"ConstKind::Expr(e)"}]}
source_snippet:             ConstKind::Expr(e) => ConstKind::Expr(e.fold_with(folder)),
context_before:             ConstKind::Value(v) => ConstKind::Value(v.fold_with(folder)),