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This implements proposal #2022, with changes from #3763 and leads answers on #6448 Detection of unusedness is happening in ~~`toolchain/check/dataflow_analysis.cpp`~~ next PR. See [here](https://github.com/burakemir/carbon-lang/tree/unused_pattern_bindings_p2022_impl_part2) for preview. ~~All test cases with unused bindings were updated in order to avoid polluting test output.~~ --------- Co-authored-by: Dana Jansens <danakj@orodu.net>