Format comment in a nicer way.
Just kidding I'm doing this only to unstuck @bors/homu/buildbot.
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@ -306,8 +306,8 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx Substs<'tcx> {
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fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
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let params: Vec<_> = self.iter().map(|k| k.fold_with(folder)).collect();
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// If folding doesn't change the substs, it's faster to avoid calling
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// `mk_substs` and instead reuse the existing substs.
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// If folding doesn't change the substs, it's faster to avoid
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// calling `mk_substs` and instead reuse the existing substs.
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if params[..] == self[..] {
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self
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} else {
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