ivtest: Add test for $left / $right on structure field

See issue #1032

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

ivtest/ivltests/struct_field_left_right.v

@@ -0,0 +1,23 @@
+module main;
+
+   typedef struct packed {
+      logic [15:8] f;
+   } structtype;
+
+   structtype s;
+
+   initial
+   begin
+      $display("$left(s.f) = %2d, $right(s.f) = %2d", $left(s.f), $right(s.f));
+      if ($left(s.f) !== 15) begin
+         $display("FAILED -- $left(s.f) = %2d", $left(s.f));
+         $finish;
+      end
+      if ($right(s.f) !== 8) begin
+         $display("FAILED -- $right(s.f) = %2d", $right(s.f));
+         $finish;
+      end
+      $display("PASSED");
+   end
+
+endmodule

ivtest/regress-vvp.list

@@ -46,6 +46,7 @@ pr903				vvp_tests/pr903.json
 pr903-vlog95			vvp_tests/pr903-vlog95.json
 pv_wr_fn_vec2			vvp_tests/pv_wr_fn_vec2.json
 pv_wr_fn_vec4			vvp_tests/pv_wr_fn_vec4.json
+struct_field_left_right		vvp_tests/struct_field_left_right.json
 struct_packed_write_read	vvp_tests/struct_packed_write_read.json
 struct_packed_write_read2	vvp_tests/struct_packed_write_read2.json
 sv_2state_array_init_prop	vvp_tests/sv_2state_array_init_prop.json

ivtest/vvp_tests/struct_field_left_right.json

@@ -0,0 +1,5 @@
+{
+    "type"   : "normal",
+    "source" : "struct_field_left_right.v",
+    "iverilog-args" : [ "-g2009" ]
+}