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module top (input logic clock, ctrl);
logic read = 0, write = 0, ready = 0;
always @(posedge clock) begin
read <= !ctrl;
write <= ctrl;
ready <= write;
end
a_rw: assert property ( @(posedge clock) !(read && write) );
`ifdef FAIL
a_wr: assert property ( @(posedge clock) write |-> ready );
`else
a_wr: assert property ( @(posedge clock) write |=> ready );
`endif
endmodule
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