Avoid an unnecessary clone in `generic_extensions`.
This avoids ~800,000 allocations in html5ever.
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@ -139,9 +139,9 @@ fn generic_extension<'cx>(cx: &'cx ExtCtxt,
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macro_ident: name
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})
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}
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Failure(sp, ref msg) => if sp.lo >= best_fail_spot.lo {
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Failure(sp, msg) => if sp.lo >= best_fail_spot.lo {
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best_fail_spot = sp;
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best_fail_msg = (*msg).clone();
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best_fail_msg = msg;
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},
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Error(err_sp, ref msg) => {
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cx.span_fatal(err_sp.substitute_dummy(sp), &msg[..])
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