Add UNSUPPORTED on dotted disable instead of syntax error

src/verilog.y

@@ -3559,8 +3559,10 @@ statement_item<nodep>:          // IEEE: statement_item
         //
         //                      // IEEE: disable_statement
         |       yDISABLE yFORK ';'                      { $$ = new AstDisableFork{$1}; }
-        |       yDISABLE idAny/*hierarchical_identifier-task_or_block*/ ';'
+        |       yDISABLE idAny/*UNSUP: hierarchical_identifier-task_or_block*/ ';'
                         { $$ = new AstDisable{$1, *$2}; }
+        |       yDISABLE idAny '.' idDotted ';'
+                        { $$ = nullptr; BBUNSUP($4, "Unsupported: disable with '.'"); }
         //                      // IEEE: event_trigger
         |       yP_MINUSGT idDotted/*hierarchical_identifier-event*/ ';'
                         { $$ = new AstFireEvent{$1, $2, false}; }

test_regress/t/t_for_disable_dot.out

@@ -0,0 +1,5 @@
+%Error-UNSUPPORTED: t/t_for_disable_dot.v:14:35: Unsupported: disable with '.'
+   14 |             if (i == 5) disable t.named;
+      |                                   ^~~~~
+                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
+%Error: Exiting due to

test_regress/t/t_for_disable_dot.pl

@@ -0,0 +1,19 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(linter => 1);
+
+lint(
+    fails => $Self->{vlt_all},
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;

test_regress/t/t_for_disable_dot.v

@@ -0,0 +1,22 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2023 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/);
+
+   int i;
+
+   initial begin
+      begin : named
+         for (i = 0; i < 10; ++i) begin : loop
+            if (i == 5) disable t.named;
+         end
+      end
+      if (i != 5) $stop;
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule