1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Check that we are refusing to match on complex nonterminals for which tokens are
12 // unavailable and we'd have to go through AST comparisons.
14 #![feature(decl_macro)]
16 macro simple_nonterminal($nt_ident: ident, $nt_lifetime: lifetime, $nt_tt: tt) {
17 macro n(a $nt_ident b $nt_lifetime c $nt_tt d) {
21 n!(a $nt_ident b $nt_lifetime c $nt_tt d);
24 macro complex_nonterminal($nt_item: item) {
25 macro n(a $nt_item b) {
29 n!(a $nt_item b); //~ ERROR no rules expected the token `enum E { }`
32 simple_nonterminal!(a, 'a, (x, y, z)); // OK
34 complex_nonterminal!(enum E {});