Include backtrace when printing THE-END exceptions

src/core/Rakudo/Internals.pm6

@@ -1618,7 +1618,8 @@ my constant $?BITS = nqp::isgt_i(nqp::add_i(2147483648, 1), 0) ?? 64 !! 32;
 #?endif
                     if @exceptions {
                         note "Some exceptions were thrown in END blocks:";
-                        note "  $_.^name(): $_.message()" for @exceptions;
+                        note "  $_.^name(): $_.message() $_.backtrace()"
+                          for @exceptions;
                     }
                     nqp::not_i(($the-end-is-done = 1)); # we're really done now
                 }