tree 7c54dabdc1a8a57a5da2d78f5c87b21971428cbf
parent a29ba0010765cb63de71a92df8c701e8e87878fc
parent d7a18f89864a4360230e3cbbdcbf22d9864a86e0
author Dylan DPC <dylan.dpc@gmail.com> 1579434729 +0530
committer GitHub <noreply@github.com> 1579434729 +0530
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Rollup merge of #68348 - xfix:patch-14, r=nagisa

Make iter::Empty<T> Send and Sync for any T

Continuing from #57682

It's quite funny, when I initially submitted this pull request, I said "Likely nobody will be using that property of `iter::empty`", but then a year later I got a compilation error because it wasn't `Send` and `Sync`.

Unfortunately, `PhantomData<fn() -> T>` still errors out. Oh well. I proposed `
struct PhantomFnWorkaround<T>(fn() -> T);`, but dtolnay did not like it, so using explicit implementations.