{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
        let mut parameters: Vec<hir::Param<'_>> = Vec::new();
    ) -> (&'hir [hir::Param<'hir>], hir::Expr<'hir>) {
        let mut statements: Vec<hir::Stmt<'_>> = Vec::new();