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Avoid iterating two times over the list of LHSes.

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This commit is contained in:
Leo Testard 2016-05-19 00:38:08 +02:00
parent eb364e9c29
commit 7d521445fd
1 changed files with 4 additions and 5 deletions
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9
src/libsyntax/ext/tt/macro_rules.rs
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@ -291,17 +291,16 @@ pub fn compile<'cx>(cx: &'cx mut ExtCtxt,
let lhses = match **argument_map.get(&lhs_nm.name).unwrap() {
MatchedSeq(ref s, _) => {
s.iter().map(|m| match **m {
MatchedNonterminal(NtTT(ref tt)) => (**tt).clone(),
MatchedNonterminal(NtTT(ref tt)) => {
valid &= check_lhs_nt_follows(cx, tt);
(**tt).clone()
}
_ => cx.span_bug(def.span, "wrong-structured lhs")
}).collect()
}
_ => cx.span_bug(def.span, "wrong-structured lhs")
};
for lhs in &lhses {
valid &= check_lhs_nt_follows(cx, lhs);
}
let rhses = match **argument_map.get(&rhs_nm.name).unwrap() {
MatchedSeq(ref s, _) => {
s.iter().map(|m| match **m {