https://git.ruby-lang.org/ruby.git/commit/?id=6876aa38f6

From 6876aa38f607cdd6fb24910e54143d9110d025c9 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 20 Dec 2019 22:50:46 +0900
Subject: Added `FEATURE_SET_RESTORE` macro


diff --git a/ruby.c b/ruby.c
index 60c57d6..dae928a 100644
--- a/ruby.c
+++ b/ruby.c
@@ -144,6 +144,7 @@ rb_feature_set_to(ruby_features_t *feat, unsigned int bit_mask, unsigned int bit https://github.com/ruby/ruby/blob/trunk/ruby.c#L144
 #define FEATURE_SET_TO(feat, bit_mask, bit_set) \
     rb_feature_set_to(&(feat), bit_mask, bit_set)
 #define FEATURE_SET(feat, bits) FEATURE_SET_TO(feat, bits, bits)
+#define FEATURE_SET_RESTORE(feat, save) FEATURE_SET_TO(feat, (save).mask, (save).set & (save).mask)
 #define FEATURE_SET_P(feat, bits) ((feat).set & (bits))
 
 struct ruby_cmdline_options {
@@ -1582,7 +1583,7 @@ process_options(int argc, char **argv, ruby_cmdline_options_t *opt) https://github.com/ruby/ruby/blob/trunk/ruby.c#L1583
 	    opt->ext.enc.name = ext_enc_name;
 	if (int_enc_name)
 	    opt->intern.enc.name = int_enc_name;
-        FEATURE_SET_TO(opt->features, feat.mask, feat.set & feat.mask);
+        FEATURE_SET_RESTORE(opt->features, feat);
     }
 
     if (opt->src.enc.name)
-- 
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