rustup --version tries to install a toolchain

[couchand]

Problem

When in a directory with a rust-toolchain file, the command rustup --version tries to start installing the specified toolchain. This seems quite surprising.

Steps

1. Navigate to a folder with a rust-toolchain file.
2. rustup uninstall the specified toolchain
3. rustup --version

Possible Solution(s)

No response

Notes

No response

Rustup version

$ rustup --version
rustup 1.24.3 (ce5817a94 2021-05-31)

Installed toolchains

$ rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/couch/snap/rustup/common/rustup

installed toolchains
--------------------

stable-x86_64-unknown-linux-gnu (default)
nightly-2021-10-05-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu

installed targets for active toolchain
--------------------------------------

wasm32-unknown-unknown
x86_64-unknown-linux-gnu

active toolchain
----------------

stable-x86_64-unknown-linux-gnu (default)
rustc 1.56.1 (59eed8a2a 2021-11-01)

[Rustin170506]

Duplicate of #1397