yosys/tests/various/elab_sys_tasks.sv

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module test;
localparam X=1;
genvar i;
generate
if (X == 1)
$info("X is 1");
if (X == 1)
$warning("X is 1");
else
$error("X is not 1");
case (X)
1: $info("X is 1 in a case statement");
endcase
//case (X-1)
// 1: $warn("X is 2");
// default: $warn("X might be anything in a case statement");
//endcase
for (i = 0; i < 3; i = i + 1)
begin
case(i)
0: $info;
1: $warning;
default: $info("default case statemnent");
endcase
end
$info("This is a standalone $info(). Next $info has no parameters");
$info;
endgenerate
endmodule