1 // Check that we are refusing to match on complex nonterminals for which tokens are 2 // unavailable and we'd have to go through AST comparisons. 3 4 #![feature(decl_macro)] 5 6 macro simple_nonterminal($nt_ident: ident, $nt_lifetime: lifetime, $nt_tt: tt) { 7 macro n(a $nt_ident b $nt_lifetime c $nt_tt d) { 8 struct S; 9 } 10 11 n!(a $nt_ident b $nt_lifetime c $nt_tt d); 12 } 13 14 macro complex_nonterminal($nt_item: item) { 15 macro n(a $nt_item b) { 16 struct S; 17 } 18 19 n!(a $nt_item b); //~ ERROR no rules expected the token `enum E { }` 20 } 21 22 simple_nonterminal!(a, 'a, (x, y, z)); // OK 23 24 complex_nonterminal!(enum E {}); 25 main()26fn main() {} 27