Kleene ? macro operator is now supported in 2015 #616
Description
Done in rust-lang/rust#60932.
There are some notes in https://doc.rust-lang.org/nightly/reference/macros-by-example.html about Rust 2018 that we need to remove.
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Done in rust-lang/rust#60932.
There are some notes in https://doc.rust-lang.org/nightly/reference/macros-by-example.html about Rust 2018 that we need to remove.