unable to use anyzig together with zig.vim

[giganteous]

Hi,

I'm a vim (neovim) user, using this plugin directly, together with (since a few weeks) anyzig for selecting the correct zig version automatically. Anyzig prints out a header on STDERR, which gets inserted into the formatted zig code on write:

anyzig: zig version '0.14.0' pulled from '/home/kai/git/thirdparty/huniq/build.zig.zon'
anyzig: appdata '/home/kai/.local/share/anyzig'
anyzig: zig '0.14.0' already exists at '/home/kai/.cache/zig/p/N-V-__8AANS1ihIOtIbwStI19vHd9274HDAeXLQjJFgZzdsY'
<the rest of the zig code here>

It seems vim.zig's formatting doesn't handle the STDERR separately of STDOUT.

I would suggest a patch so zig fmt's STDERR gets redirected to a tmpfile, and only parsing that for errors on non-zero exit codes, but I'm quite new to this project and how it's related to neovim and vim itself. Is this (project) the right place to suggest a fix?

(This bug was initially reported in anyzig as marler8997/anyzig#20, but didn't belong there)