Mara Bos 446ed77124
Rollup merge of #80567 - lukaslueg:intersperse_with, r=m-ou-se
Add Iterator::intersperse_with

This is a follow-up to #79479, tracking in #79524, as discussed https://github.com/rust-lang/rust/pull/79479#issuecomment-752671731.

~~Note that I had to manually implement `Clone` and `Debug` because `derive` insists on placing a `Clone`-bound on the struct-definition, which is too narrow. There is a long-standing issue # for this somewhere around here :-)~~

Also, note that I refactored the guts of `Intersperse` into private functions and re-used them in `IntersperseWith`, so I also went light on duplicating all the tests.

If this is suitable to be merged, the tracking issue should be updated, since it only mentions `intersperse`.

Happy New Year!

r? ``@m-ou-se``
2021-01-14 18:00:06 +00:00
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