Error Invalid cross-device link on Linux with tmpfs /tmp

[mati865]

Running rustup-toolchain-install-master c131bdcaff68d35f96e954baac4340206779335f on Linux with tmpfs mounted /tmp gives me:

Os { code: 18, kind: Other, message: "Invalid cross-device link" }

This is because rustup-toolchain-install-master downloads into /tmp and tries to link it to user home.
One cannot hard link between partitions, creating symbolic links would work however (dunno if rustc would work that way).
Looked into code more carefully and this crate uses std::fs::rename which cannot move to different mount point.

[mati865]

Confirming the fix is working.
Thank you for quick reaction. 🥇