add regression test for #24229

Author: mauke

t/re/pat_rt_report.t

@@ -20,7 +20,7 @@ use warnings;
 use 5.010;
 use Config;
 
-plan tests => 2514;  # Update this when adding/deleting tests.
+plan tests => 2515;  # Update this when adding/deleting tests.
 
 run_tests() unless caller;
 
@@ -1168,6 +1168,14 @@ EOP
 		ok($result == 0);
 	}
 
+    {
+        # GH #24229
+        # utf8.c:72: Perl_force_out_malformed_utf8_message_: Assertion `p < e' failed.
+        use utf8;
+        my $éx = 0;
+        $_ = qr/$_[$éx]/ if 0;
+        ok(1, "GH #24229 - non-ascii variable in brackets doesn't crash S_intuit_more()");
+    }
 } # End of sub run_tests
 
 1;