Add regression test for #1224: Packed vs unpacked dimension confusion

This bug was fixed by the #1265 fix. Single-element unpacked arrays
of packed types (like byte [0:0]) now work correctly in continuous
assignments.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ivtest/ivltests/br_gh1224.v

@@ -0,0 +1,20 @@
+// Test for GitHub issue #1224
+// Packed vs unpacked dimension confusion with byte array
+module a(output byte b [0:0]);
+  assign b = '{8'd1};  // Should be interpreted as single byte value
+endmodule
+
+module test;
+  wire byte out_b [0:0];
+
+  a dut(.b(out_b));
+
+  initial begin
+    #1;
+    if (out_b[0] !== 8'd1) begin
+      $display("FAILED: out_b[0] = %d, expected 1", out_b[0]);
+      $finish;
+    end
+    $display("PASSED");
+  end
+endmodule

ivtest/regress-sv.list

@@ -236,6 +236,7 @@ br_gh1222		CE,-g2009		ivltests gold=br_gh1222.gold
 br_gh1223a		normal,-g2009		ivltests
 br_gh1223b		normal,-g2009		ivltests
 br_gh1223c		normal,-g2009		ivltests
+br_gh1224		normal,-g2012		ivltests
 br_gh1230		normal,-g2009		ivltests
 br_ml20171017		normal,-g2009		ivltests
 br_ml20180227		CE,-g2009		ivltests