Update warning flags before dump

ruby.c

@@ -1739,6 +1739,8 @@ Init_extra_exts(void)
 static void
 ruby_opt_init(ruby_cmdline_options_t *opt)
 {
+    rb_warning_category_update(opt->warn.mask, opt->warn.set);
+
     if (opt->dump & dump_exit_bits) return;
 
     if (FEATURE_SET_P(opt->features, gems)) {
@@ -1754,8 +1756,6 @@ ruby_opt_init(ruby_cmdline_options_t *opt)
         }
     }
 
-    rb_warning_category_update(opt->warn.mask, opt->warn.set);
-
     /* [Feature #19785] Warning for removed GC environment variable.
      * Remove this in Ruby 3.4. */
     if (getenv("RUBY_GC_HEAP_INIT_SLOTS")) {

test/ruby/test_rubyoptions.rb

@@ -296,6 +296,8 @@ class TestRubyOptions < Test::Unit::TestCase
     warning = /compiler based on the Prism parser is currently experimental/
 
     assert_in_out_err(%w(--parser=prism -e) + ["puts :hi"], "", %w(hi), warning)
+    assert_in_out_err(%w(--parser=prism -W:no-experimental -e) + ["puts :hi"], "", %w(hi), [])
+    assert_in_out_err(%w(--parser=prism -W:no-experimental --dump=parsetree -e :hi), "", /"hi"/, [])
 
     assert_in_out_err(%w(--parser=parse.y -e) + ["puts :hi"], "", %w(hi), [])
     assert_norun_with_rflag('--parser=parse.y', '--version', "")