OpenFPGA/yosys/tests/sva/basic00.sv

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module top (input clk, reset, antecedent, output reg consequent);
always @(posedge clk)
consequent <= reset ? 0 : antecedent;
`ifdef FAIL
test_assert: assert property ( @(posedge clk) disable iff (reset) antecedent |-> consequent )
else $error("Failed with consequent = ", $sampled(consequent));
`else
test_assert: assert property ( @(posedge clk) disable iff (reset) antecedent |=> consequent )
else $error("Failed with consequent = ", $sampled(consequent));
`endif
endmodule