Add regression tests for issue #1256.

ivtest/ivltests/br_gh1256a.v

@@ -0,0 +1,24 @@
+module test();
+
+typedef struct packed {
+  logic [3:0] a;
+} inner_t;
+
+typedef struct packed {
+  inner_t [1:0][3:0] fields;
+} outer_t;
+
+outer_t var1;
+outer_t var2;
+
+initial begin
+  var1 = 32'h12345678;
+  var2.fields = var1.fields;
+  $display("%h", var2);
+  if (var2 === 32'h12345678)
+    $display("PASSED");
+  else
+    $display("FAILED");
+end
+
+endmodule

ivtest/ivltests/br_gh1256b.v

@@ -0,0 +1,25 @@
+module test();
+
+typedef struct packed {
+  logic [3:0] a;
+} inner_t;
+
+typedef struct packed {
+  inner_t [1:0][3:0] fields;
+} outer_t;
+
+outer_t var1;
+outer_t var2;
+
+initial begin
+  var1 = 32'h12345678;
+  var2.fields[0] = var1.fields[1];
+  var2.fields[1] = var1.fields[0];
+  $display("%h", var2);
+  if (var2 === 32'h56781234)
+    $display("PASSED");
+  else
+    $display("FAILED");
+end
+
+endmodule

ivtest/regress-vvp.list

@@ -65,6 +65,8 @@ br_gh1180b			vvp_tests/br_gh1180b.json
 br_gh1181			vvp_tests/br_gh1181.json
 br_gh1184			vvp_tests/br_gh1184.json
 br_gh1242			vvp_tests/br_gh1242.json
+br_gh1256a			vvp_tests/br_gh1256a.json
+br_gh1256b			vvp_tests/br_gh1256b.json
 ca_time_real			vvp_tests/ca_time_real.json
 case1				vvp_tests/case1.json
 case2				vvp_tests/case2.json

ivtest/vvp_tests/br_gh1256a.json

@@ -0,0 +1,5 @@
+{
+    "type"   : "normal",
+    "source" : "br_gh1256a.v",
+    "iverilog-args" : [ "-g2009" ]
+}

ivtest/vvp_tests/br_gh1256b.json

@@ -0,0 +1,5 @@
+{
+    "type"   : "normal",
+    "source" : "br_gh1256a.v",
+    "iverilog-args" : [ "-g2009" ]
+}