Matthias Krüger 8fe7a4937c
Rollup merge of #110819 - tamird:flattencompat-trustedlen, r=the8472
simplify TrustedLen impls

Implement on FlattenCompat and delegate from Flatten and FlatMap.

/cc ``@the8472``
2023-04-26 18:51:43 +02:00
..