rustdoc: `--document-private-items` does not document non-exported macros

[camelid]

With --document-private-items:

• private fns are documented
• public fns are documented
• #[macro_export] macro_rules! are documented
• non-exported macro_rules! are not documented

I'm not sure if this is intended behavior, but it's not very intuitive and kind of frustrating.

Code

macro_rules! foo_macro {
    () => { };
}

#[macro_export]
macro_rules! exported_foo_macro {
    () => { };
}

fn foo_fn() {}

pub fn pub_foo_fn() {}

Command

cargo doc --document-private-items

Output

Version

$ rustdoc -vV
rustdoc 1.47.0 (18bf6b4f0 2020-10-07)
binary: rustdoc
commit-hash: 18bf6b4f01a6feaf7259ba7cdae58031af1b7b39
commit-date: 2020-10-07
host: x86_64-apple-darwin
release: 1.47.0
LLVM version: 11.0

[jonas-schievink]

Duplicate of #73754

[camelid]

Dang, I searched for it, but the title confused me so I thought it was something else.