Add missing `must_use` attributes on adaptors

rust-itertools / itertools

Extra iterator adaptors, iterator methods, free functions, and macros.

https://docs.rs/itertools/

Apache License 2.0

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Closed Philippe-Cholet closed 11 months ago

Philippe-Cholet commented 11 months ago

Related to #791 and #792

Those six adaptors are (already) lazy, only the must_use attribute is missing.