structopt
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error[E0635]: unknown feature `proc_macro_span_shrink`
--> /home/cacilhas/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.59/src/lib.rs:92:30
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92 | feature(proc_macro_span, proc_macro_span_shrink)
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Versions 0.2.18 until 0.3.26, stopped working in nightly 0.72.