module test(c); input [9:0] c; function integer a(input integer b); begin a = b+1; end endfunction localparam f = 5; wire [a(f)-1:0] d; //wire [a(f)-1:0] d1; assign d = c[a(f)-1:0]; // wrong behavior localparam e = a(f); //assign d1 = c[e-1:0]; // correct behavior endmodule
