27 lines
644 B
Rust
27 lines
644 B
Rust
// Check that we are refusing to match on complex nonterminals for which tokens are
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// unavailable and we'd have to go through AST comparisons.
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#![feature(decl_macro)]
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macro simple_nonterminal($nt_ident: ident, $nt_lifetime: lifetime, $nt_tt: tt) {
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macro n(a $nt_ident b $nt_lifetime c $nt_tt d) {
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struct S;
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}
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n!(a $nt_ident b $nt_lifetime c $nt_tt d);
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}
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macro complex_nonterminal($nt_item: item) {
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macro n(a $nt_item b) {
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struct S;
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}
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n!(a $nt_item b); //~ ERROR no rules expected the token `enum E {}`
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}
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simple_nonterminal!(a, 'a, (x, y, z)); // OK
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complex_nonterminal!(enum E {});
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fn main() {}
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