{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
        let mut idents = self.path.iter().map(|s| Ident::new(*s, span)).collect();
    ) -> ast::Path {
        let tys = self.params.iter().map(|t| t.to_ty(cx, span, self_ty, self_generics));