On the fly syntax check support using Nimsuggest and flycheck.el. You could find another flycheck backend for Nim at https://github.com/ALSchwalm/flycheck-nim which use `nim check` command. Because of introducing new flymake (https://lists.gnu.org/archive/html/emacs-devel/2017-09/msg00953.html) from Emacs 26, this package is moved outside of nim-mode repository Manual configuration: If you install this package from MELPA, probably this package should work automatically, (if you followed nim-mode's instruction) but if not, please use below manual configuration. ``` elisp (add-hook 'nimsuggest-mode-hook 'flycheck-nimsuggest-setup) ```