verilator/test_regress/t/t_iff.out

%Error-UNSUPPORTED: t/t_iff.v:66:15: Unsupported: event expression 'iff'
   66 |    always @(d iff enable) begin
      |               ^~~
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_iff.v:71:23: Unsupported: event expression 'iff'
   71 |    always @(posedge d iff enable) begin
      |                       ^~~
%Error-UNSUPPORTED: t/t_iff.v:76:23: Unsupported: event expression 'iff'
   76 |    always @(negedge d iff enable) begin
      |                       ^~~
%Error-UNSUPPORTED: t/t_iff.v:81:20: Unsupported: event expression 'iff'
   81 |    always @(edge d iff enable) begin
      |                    ^~~
%Error-UNSUPPORTED: t/t_iff.v:86:35: Unsupported: event expression 'iff'
   86 |    assert property (@(posedge clk iff enable)
      |                                   ^~~
%Error: Exiting due to