{"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"return"}]}
    return match guard {
pub fn match_arm(pat: ast::Pat, guard: Option<ast::MatchGuard>, expr: ast::Expr) -> ast::MatchArm {
        Some(guard) => from_text(&format!("{pat} {guard} => {expr}")),