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Currently, only
#![bare_trait_objects)]
is used (bare_trait_objects is included in rust_2018_idioms), but since#![deny(rust_2018_idioms)]
is used in rust-lang/rust (see rust-lang/rust#58099), I would like to use#![deny(rust_2018_idioms)]
#![warn(rust_2018_idioms)]
even in futures-rs.