:RustFmt outputs formatted text to pager instead of formatting it in buffer

[GoldsteinE]

rust.vim version:
c06a17151c69b9d61e60a28274932a28fd37c453

Steps to reproduce:

1. Open any Rust file
2. Enter :RustFmt<CR>

Expected vs. actual behavior:

• Expected: file is formatted
• Actual: formatted file is shown in separate pager without highlighting

Paste debugging info from the Rust Vim plugin via one of the following
commands: :RustInfo, :RustInfoToClipboard, or :RustInfoToFile <filename>.

None of this commands exist.

I use NeoVim v0.6.0-dev and rustfmt 1.4.37-nightly (f586d79 2021-06-13)

[lrabbt]

I had the same problem using the pre-packaged rust.vim from NeoVim v0.5.1 on Arch.

It happened because --write-output=overwrite was hardcoded on autoload/rustfmt.vim:RustfmtCommand and it seems to be an option that is not present on rustfmt v1.4.37-stable (the version I have here).

I solved it by having vim-plug update the plugin directly from this repository, since the problem seems to have been solved already on master branch.