Macro used in header is reported as used only once

[elbrujohalcon]

Bug Description

If a macro is only used in the same header file where it's defined, it's reported as only used once. That is dumb since the way to solve that issue would be to move the macro to the place where it's used… which… well… it's the same actual place.

To Reproduce

Create this header file:

-define(ONE, 1).
-define(TWO, ?ONE + ?ONE).

Include it in two modules and use ?TWO in both of them.
Run rebar3 hank and you'll get…

===> The following pieces of code are dead and should be removed:
include/header.hrl:1: ?ONE is used only at include/header.hrl

Expected Behavior

No warnings.