Improvements :-) ...

dot_vimrc

@@ -84,9 +84,12 @@ let g:terraform_fmt_on_save=1
 " dense-analysis/ale options
 let g:ale_history_log_output = 1
 let g:ale_use_global_executables = 1
+let g:ale_fix_on_save = 1
+let g:ale_completion_enabled = 1
 let g:ale_fixers = {
 \   '*': ['remove_trailing_lines', 'trim_whitespace'],
 \   'python': ['black'],
+\   'rust': ['rustfmt'],
 \}
 
 " Enable syntax highlighting