W0078 - Duplicate Include

Warning

-include("header.hrl").
-include("header.hrl").
    %%  ^^^^^^^^^^^^^^^^ warning: Duplicate include: header.hrl

Explanation

The same header file is included more than once in this module. Duplicate includes are redundant, or a signal of a convoluted macro definitions and should be resolved. The diagnostic traverses include paths to detect duplicates even when different include forms (-include vs -include_lib).