/*
 * Copyright (C) 2020  The SymbiFlow Authors.
 *
 * Use of this source code is governed by a ISC-style
 * license that can be found in the LICENSE file or at
 * https://opensource.org/licenses/ISC
 */

/*
 * `input wire a` should be detected as a clock because it drives the flip
 * flop. However, it has the attribute CLOCK set to 0 which should force it
 * to be a regular input.
 */
module BLOCK(a, b, c);
    (* CLOCK=0 *)
    input wire a;
    input wire b;
    output wire c;
    
    reg r;
    always @ ( posedge a ) begin
    	r <= b;
    end
    assign c = r;
endmodule