%Warning-IMPLICIT: t/t_lint_implicit.v:10: Signal definition not found, creating implicitly: 'b'
   assign b = 1'b1;
          ^
                   ... Use "/* verilator lint_off IMPLICIT */" and lint_on around source to disable this message.
%Warning-IMPLICIT: t/t_lint_implicit.v:12: Signal definition not found, creating implicitly: 'nt0'
   or   OR0 (nt0, a, b);
             ^~~
%Warning-IMPLICIT: t/t_lint_implicit.v:15: Signal definition not found, creating implicitly: 'dummy1'
                                         : ... Suggested alternative: 'dummy_ip'
   assign {dummy1, dummy2} = dummy_ip;
           ^~~~~~
%Warning-IMPLICIT: t/t_lint_implicit.v:15: Signal definition not found, creating implicitly: 'dummy2'
                                         : ... Suggested alternative: 'dummy1'
   assign {dummy1, dummy2} = dummy_ip;
                   ^~~~~~
%Error: Exiting due to
