`timescale 1ns / 1ps

/**
 * counter: a generic clearable up-counter
 */

module counter
    #(parameter WIDTH=64, NAME="world")
    (
        input clk,
        input ce,
        input arst_n,
        output reg [WIDTH-1:0] q
    );
    
    string name = "counter";
    localparam val0 = 12'ha1f;
    localparam val1 = 12'h1fa;
    localparam val2 = 12'hfa1;

    // some child
    clock_buffer #(WIDTH) buffer_inst (
      .clk(clk),
      .ce(ce),
      .reset(arst_n)
    );

    // Simple gated up-counter with async clear

    always @(posedge clk or negedge arst_n) begin
        if (arst_n == 1'b0) begin
            q <= {WIDTH {1'b0}};
            end
        else begin
            q <= q;
            if (ce == 1'b1) begin
                q <= q + 1;
            end
        end
    end

    function int add_one(int x);
      return x + 1;
    endfunction : add_one

`ifdef SIMULATION
initial $display("Hello %s", NAME);
`endif
endmodule : counter

class my_data extends uvm_data;
  int x, y;

  function add_one();
    x++;
    y++;
  endfunction : add_one
endclass : my_data

EDIT: We haven't got Verilog support as Ben Kelly mentioned in the comments. The following snippet has no language code, thus we see the result of auto detection.

`timescale 1ns / 1ps

/**
 * counter: a generic clearable up-counter
 */

module counter
    #(parameter WIDTH=64, NAME="world")
    (
        input clk,
        input ce,
        input arst_n,
        output reg [WIDTH-1:0] q
    );
    
    string name = "counter";
    localparam val0 = 12'ha1f;
    localparam val1 = 12'h1fa;
    localparam val2 = 12'hfa1;

    // some child
    clock_buffer #(WIDTH) buffer_inst (
      .clk(clk),
      .ce(ce),
      .reset(arst_n)
    );

    // Simple gated up-counter with async clear

    always @(posedge clk or negedge arst_n) begin
        if (arst_n == 1'b0) begin
            q <= {WIDTH {1'b0}};
            end
        else begin
            q <= q;
            if (ce == 1'b1) begin
                q <= q + 1;
            end
        end
    end

    function int add_one(int x);
      return x + 1;
    endfunction : add_one

`ifdef SIMULATION
initial $display("Hello %s", NAME);
`endif
endmodule : counter

class my_data extends uvm_data;
  int x, y;

  function add_one();
    x++;
    y++;
  endfunction : add_one
endclass : my_data