Flycheck

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Flycheck
Description on-the-fly syntax checking
Source https://github.com/flycheck/flycheck
Part of Emacs no

Overview

Flycheck is a modern on-the-fly syntax checking extension for GNU Emacs, intended as replacement for the older Flymake extension which is part of GNU Emacs. For a detailed comparison to Flymake see Flycheck versus Flymake.

It uses various syntax checking and linting tools to automatically check the contents of buffers while you type, and reports warnings and errors directly in the buffer, or in an optional error list:

Flycheck-annotated.png