Linting blocks vim for multiple seconds and keeps a lock on the working dir

[mara-schulke]

Hi, when i run a syntastic lint while this plugin is installed, vim gets blocked for multiple seconds.
Apparently i am unable to run any other cargo commands while the lint is going on aswell since this plugin seems to lock the directory.

Output from other cargo commands while linting

    Blocking waiting for file lock on build directory

• rust.vim version: Vim Plug and rust.vim@4aa69b84c8a58fcec6b6dad6fe244b916b1cf830

Steps to reproduce:

1. Use Vim Plug, Syntastic and rust.vim together
2. Open any rust project
3. Run a syntastic lint

Expected vs. actual behavior:

rust.vim shouldnt lock my working directory and shouldnt freeze vim.
it should run asynchronously in the background

 RustInfo
rust.vim Global Variables:

let g:ftplugin_rust_source_path = v:null
let g:loaded_syntastic_rust_cargo_checker = 1
let g:loaded_syntastic_rust_filetype = v:null
let g:loaded_syntastic_rust_rustc_checker = 1
let g:rust_bang_comment_leader = v:null
let g:rust_cargo_avoid_whole_workspace = v:null
let g:rust_clip_command = v:null
let g:rust_conceal = v:null
let g:rust_conceal_mod_path = v:null
let g:rust_conceal_pub = v:null
let g:rust_conceal_mod_path = v:null
let g:rust_conceal_pub = v:null
let g:rust_fold = v:null
let g:rust_last_args = v:null
let b:rust_last_args = []
let g:rust_last_rustc_args = v:null
let b:rust_last_rustc_args = []
let g:rust_original_delimitMate_excluded_regions = v:null
let g:rust_playpen_url = v:null
let g:rust_prev_delimitMate_quotes = v:null
let g:rust_recent_nearest_cargo_tol = v:null
let g:rust_recent_root_cargo_toml = v:null
let b:rust_recent_root_cargo_toml = 'Cargo.toml'
let g:rust_recommended_style = v:null
let g:rust_set_conceallevel = v:null
let g:rust_set_conceallevel=1 = v:null
let g:rust_set_foldmethod = v:null
let g:rust_set_foldmethod=1 = v:null
let g:rust_shortener_url = v:null
let g:rustc_makeprg_no_percent = v:null
let g:rustc_path = v:null
let g:rustfmt_autosave = 1
let g:rustfmt_autosave_if_config_present = v:null
let g:rustfmt_command = 'rustfmt'
let g:rustfmt_emit_files = 1
let g:rustfmt_fail_silently = 0
let g:rustfmt_options = ''
let g:syntastic_extra_filetypes = ['rust']
let g:syntastic_rust_cargo_fname = ''
rustfmt 1.4.37-nightly (003d8d3 2021-10-04)
rustc 1.57.0-nightly (003d8d3f5 2021-10-04)
cargo 1.57.0-nightly (d56b42c54 2021-09-27)

NVIM v0.6.1
Build type: Release
LuaJIT 2.1.0-beta3
Übersetzt von nixbld

Features: +acl +iconv +tui
See ":help feature-compile"
          System-vimrc-Datei: "$VIM/sysinit.vim"
     Voreinstellung für $VIM: "/nix/store/fg64f7rll0i3gk8ay4q2mca1vjk8klvc-neovim-unwrapped-0.6.1/share/nvim"

Run :checkhealth for more info
----
Info from Syntastic:
Syntastic version: 3.10.0-32 (Vim 800, Neovim, Linux)
Info for filetype: rust
Global mode: active
Filetype rust is active
The current file will be checked automatically
Available checkers: cargo rustc
Currently enabled checker: cargo