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#2243 fixed some proc-macro-related issues (#2026, #2097, rust-lang/rust#78234). I don't think it fixes proc-macro issues on NixOS (#2242 (comment) and probably #2253), but a release that includes this should be useful.
Changes:
#[proc_macro]
at Rust 1.45+ (use only_hack_old_rustc for proc_macro_hack #2243)WeakShared
(Add WeakShared. #2169)TryStreamExt::try_buffered
(Add TryStreamExt::try_buffered #2245)StreamExt::cycle
(Add StreamExt::cycle #2252)Clone
forstream::{Empty, Pending, Repeat, Iter}
(impl Clone for stream::{Empty, Pending, Repeat} #2248, Add StreamExt::cycle #2252)TryStreamExt
combinators (Fix panic in some TryStreamExt combinators #2250)