0.3 backports #2419
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0.3 backports #2419
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Signed-off-by: ktf <krunotf@gmail.com>
Prior to this diff, the Debug impl for oneshot channels printed something like:
```
Sender { inner: Inner { complete: false, data: Lock { locked: false, data: UnsafeCell }, rx_task: Lock { locked: false, data: UnsafeCell }, tx_task: Lock { locked: false, data: UnsafeCell } } }
```
which isn't very helpful. Instead, just print
`Sender { complete: false }` (or `true`, if the other end has dropped).
Note that the `T: Debug` bound is retained to allow for the possibility
of allowing slightly more interesting debug output in the future.
`cargo fmt` cannot recognize modules defined inside macros.
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Backports:
send_all&forward#2404)