vec: Remove old comment in Vec::drop
This comment was leftover from an earlier revision of a PR, something that never was merged. There is no ZST special casing in Vec::drop.
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@ -1384,10 +1384,6 @@ impl<T: Ord> Ord for Vec<T> {
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impl<T> Drop for Vec<T> {
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#[unsafe_destructor_blind_to_params]
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fn drop(&mut self) {
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// NOTE: this is currently abusing the fact that ZSTs can't impl Drop.
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// Or rather, that impl'ing Drop makes them not zero-sized. This is
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// OK because exactly when this stops being a valid assumption, we
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// don't need unsafe_no_drop_flag shenanigans anymore.
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if self.buf.unsafe_no_drop_flag_needs_drop() {
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unsafe {
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// The branch on needs_drop() is an -O1 performance optimization.
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