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W0020 - Unused Include

Error​

//- /include/foo.hrl
  -define(FOO,3).

//- /src/foo.erl
  -module(foo).
  -include("foo.hrl").
%%^^^^^^^^^^^^^^^^^^^^ 💡 warning: Unused file: foo.hrl

Explanation​

The warning message indicates that no definitions or attributes contained in the foo.hrl header are used in the foo module and therefore the include statement can be safely removed from foo.erl.

In case of a false positive, please use the standard elp:ignore mechanism to temporarily silence the warning and report this as a bug.