conversion of structs with multi-dim fields (resolves #53)

test/basic/struct_array_field.v

@@ -0,0 +1,40 @@
+module main;
+    reg [2:0] foo_x_1;
+    reg [2:0] foo_x_0;
+    reg [1:0] foo_y_2;
+    reg [1:0] foo_y_1;
+    reg [1:0] foo_y_0;
+    wire [5:0] foo_x;
+    wire [5:0] foo_y;
+    assign foo_x = {foo_x_1, foo_x_0};
+    assign foo_y = {foo_y_0, foo_y_1, foo_y_2};
+    reg foo_z;
+    wire [12:0] foo;
+    assign foo = {foo_x, foo_y, foo_z};
+
+    initial begin
+        $monitor($time, " %b %b %b %b %b %b %b %b",
+            foo, foo_x, foo_y, foo_z,
+            foo_x_0, foo_x_0[0], foo_y_0, foo_y_0[0]);
+
+        #1; foo_z = 0;
+
+        #1; {foo_y_0, foo_y_1, foo_y_2} = 0;
+        #1; foo_y_0 = 1'sb1;
+        #1; foo_y_1 = 1'sb1;
+        #1; foo_y_1[1] = 0;
+        #1; foo_y_0[0] = 1;
+        #1; foo_y_0[1] = 1;
+
+        #1; {foo_x_1, foo_x_0} = 0;
+        #1; foo_x_0 = 1'sb1;
+        #1; foo_x_1 = 1'sb1;
+        #1; foo_x_1[1] = 0;
+        #1; foo_x_0[0] = 1;
+        #1; foo_x_0[1] = 1;
+
+    end
+endmodule
+
+module top;
+endmodule