What is this MSRV lint telling me?

[xobs]

In working on the serialport-rs crate, I've started seeing errors such as this:

warning: current MSRV (Minimum Supported Rust Version) is `1.59.0` but this item is stable since `1.64.0`
   --> src/posix/ioctl.rs:131:21
    |
131 |     let mut retval: libc::c_int = 0;
    |                     ^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.95.0/index.html#incompatible_msrv

What is this error saying? Is it pointing out that libc::c_int is valid for rust 1.64.0 and newer, and will be shadowed by the libc crate I'm importing? libc is an external crate, and those values have been defined since at least libc 0.1.5 released in 2015.

[xobs]

After creating a toy example, I've realized that "this item is stable since [...]" should actually read "this item comes from a crate that has an MSRV of [...]".

I'll open an issue for that.