<p>Functionality is OK, but error messages can be improved. I tried macros:<br>
%{expr:0 || b} %{expr:4 &|| 0} %{expr:6 + 9 - o -=iu}<br>
in a spec file and error messages were:<br>
error: types must match<br>
error: syntax error while parsing &&<br>
error: types must match</p>

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