$ gitu
Error: OpenRepo(Error { code: -1, klass: 6, message: "unsupported extension name extensions.refstorage" })

$ rustup --version
rustup 1.28.2 (e4f3ad6f8 2025-04-28)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.89.0 (29483883e 2025-08-04)`

$ cargo --version
cargo 1.89.0 (c24e10642 2025-06-23)