Cargo.toml

[package]
name = "rust-bug-202010"
version = "0.1.0"
edition = "2018"

[dependencies]

extract.sh

#!/bin/sh
# Because Gist doesn't support subdirectories...

mkdir -p src

mv src-lib.rs src/lib.rs
mv src-mymodule.rs src/mymodule.rs

src-lib.rs

macro_rules! m {
    () => {
        /// A
        pub mod mymodule;
    }
}

m!();

src-mymodule.rs

//! [`long_cat`] is really long