Why does it install another 1.87.0 when the stable(1.87.0) toolchain is already installed?

help
1

When a project's rust-toolchain.toml specifies version 1.87.0, it does not use the installed stable(1.87.0) toolchain, but installs another 1.87.0 toolchain.

2

rustup just doesn't identify identical content. It's not quite as simple as letting one be an alias for the other:

3

It's too bad for my disk space. :sob:

4

On Linux you could use a file system with built in deduplication support (reflinks) such as btrfs or zfs. You can use a tool such as duperemove to do the block level deduplication with those file systems.

I have no idea if equivalent features exist on other platforms.