Update to Rust 1.56 and 2021 edition #3013
Closed
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Objective
Add 'rust-version' to all crates and update to latest edition.
Fixes issue #2998
Solution
Added 'rust-version = "1.56"' to all crates and
changed edition from 2018 to 2021.
This required adding whitespace to some rs files
containing macros, because prefix identifiers are
reserved as of 1.56.