diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index 2d7f36a3c29432..126aa8546c69c5 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -47,10 +47,15 @@ jobs:
       - name: Setup Cygwin
         uses: cygwin/cygwin-install-action@3f0a3f9f988f7e96b8c18098ae05eaec175f5b52 # v6.1
         with:
-          packages: ruby gcc-core make autoconf libtool libssl-devel libyaml-devel libffi-devel zlib-devel rubygems
+          packages: ruby gcc-core make autoconf libtool libssl-devel libyaml-devel libffi-devel zlib-devel rubygems ruby-devel
           site: |
             https://cygwin.osuosl.org/
 
+      - name: Install fiddle
+        run: |
+          gem install fiddle
+        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
+
       - name: configure
         run: |
           ./autogen.sh
diff --git a/compile.c b/compile.c
index 32e367f41b53c4..3269645e3d8d85 100644
--- a/compile.c
+++ b/compile.c
@@ -3698,8 +3698,9 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
                 if (IS_INSN(&nobj->link) && IS_INSN_ID(nobj, jump)) {
                     if (!replace_destination(iobj, nobj)) break;
                 }
-                else if (prev_dup && IS_INSN_ID(nobj, dup) &&
+                else if (prev_dup && IS_INSN(&nobj->link) && IS_INSN_ID(nobj, dup) &&
                          !!(nobj = (INSN *)nobj->link.next) &&
+                         IS_INSN(&nobj->link) &&
                          /* basic blocks, with no labels in the middle */
                          nobj->insn_id == iobj->insn_id) {
                     /*
@@ -3786,7 +3787,11 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
                     break;
                 }
                 else break;
-                nobj = (INSN *)get_destination_insn(nobj);
+                {
+                    LINK_ELEMENT *dest = get_destination_insn(nobj);
+                    if (!dest || !IS_INSN(dest)) break;
+                    nobj = (INSN *)dest;
+                }
             }
         }
     }
diff --git a/ext/-test-/regexp/depend b/ext/-test-/regexp/depend
index 5ba1b92f18898c..6e2b24ac27ec1c 100644
--- a/ext/-test-/regexp/depend
+++ b/ext/-test-/regexp/depend
@@ -160,6 +160,167 @@ init.o: $(hdrdir)/ruby/ruby.h
 init.o: $(hdrdir)/ruby/st.h
 init.o: $(hdrdir)/ruby/subst.h
 init.o: init.c
+new.o: $(RUBY_EXTCONF_H)
+new.o: $(arch_hdrdir)/ruby/config.h
+new.o: $(hdrdir)/ruby.h
+new.o: $(hdrdir)/ruby/assert.h
+new.o: $(hdrdir)/ruby/backward.h
+new.o: $(hdrdir)/ruby/backward/2/assume.h
+new.o: $(hdrdir)/ruby/backward/2/attributes.h
+new.o: $(hdrdir)/ruby/backward/2/bool.h
+new.o: $(hdrdir)/ruby/backward/2/inttypes.h
+new.o: $(hdrdir)/ruby/backward/2/limits.h
+new.o: $(hdrdir)/ruby/backward/2/long_long.h
+new.o: $(hdrdir)/ruby/backward/2/stdalign.h
+new.o: $(hdrdir)/ruby/backward/2/stdarg.h
+new.o: $(hdrdir)/ruby/defines.h
+new.o: $(hdrdir)/ruby/intern.h
+new.o: $(hdrdir)/ruby/internal/abi.h
+new.o: $(hdrdir)/ruby/internal/anyargs.h
+new.o: $(hdrdir)/ruby/internal/arithmetic.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/char.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/double.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/fixnum.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/gid_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/int.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/intptr_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/long.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/long_long.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/mode_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/off_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/pid_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/short.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/size_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/st_data_t.h
+new.o: $(hdrdir)/ruby/internal/arithmetic/uid_t.h
+new.o: $(hdrdir)/ruby/internal/assume.h
+new.o: $(hdrdir)/ruby/internal/attr/alloc_size.h
+new.o: $(hdrdir)/ruby/internal/attr/artificial.h
+new.o: $(hdrdir)/ruby/internal/attr/cold.h
+new.o: $(hdrdir)/ruby/internal/attr/const.h
+new.o: $(hdrdir)/ruby/internal/attr/constexpr.h
+new.o: $(hdrdir)/ruby/internal/attr/deprecated.h
+new.o: $(hdrdir)/ruby/internal/attr/diagnose_if.h
+new.o: $(hdrdir)/ruby/internal/attr/enum_extensibility.h
+new.o: $(hdrdir)/ruby/internal/attr/error.h
+new.o: $(hdrdir)/ruby/internal/attr/flag_enum.h
+new.o: $(hdrdir)/ruby/internal/attr/forceinline.h
+new.o: $(hdrdir)/ruby/internal/attr/format.h
+new.o: $(hdrdir)/ruby/internal/attr/maybe_unused.h
+new.o: $(hdrdir)/ruby/internal/attr/noalias.h
+new.o: $(hdrdir)/ruby/internal/attr/nodiscard.h
+new.o: $(hdrdir)/ruby/internal/attr/noexcept.h
+new.o: $(hdrdir)/ruby/internal/attr/noinline.h
+new.o: $(hdrdir)/ruby/internal/attr/nonnull.h
+new.o: $(hdrdir)/ruby/internal/attr/noreturn.h
+new.o: $(hdrdir)/ruby/internal/attr/packed_struct.h
+new.o: $(hdrdir)/ruby/internal/attr/pure.h
+new.o: $(hdrdir)/ruby/internal/attr/restrict.h
+new.o: $(hdrdir)/ruby/internal/attr/returns_nonnull.h
+new.o: $(hdrdir)/ruby/internal/attr/warning.h
+new.o: $(hdrdir)/ruby/internal/attr/weakref.h
+new.o: $(hdrdir)/ruby/internal/cast.h
+new.o: $(hdrdir)/ruby/internal/compiler_is.h
+new.o: $(hdrdir)/ruby/internal/compiler_is/apple.h
+new.o: $(hdrdir)/ruby/internal/compiler_is/clang.h
+new.o: $(hdrdir)/ruby/internal/compiler_is/gcc.h
+new.o: $(hdrdir)/ruby/internal/compiler_is/intel.h
+new.o: $(hdrdir)/ruby/internal/compiler_is/msvc.h
+new.o: $(hdrdir)/ruby/internal/compiler_is/sunpro.h
+new.o: $(hdrdir)/ruby/internal/compiler_since.h
+new.o: $(hdrdir)/ruby/internal/config.h
+new.o: $(hdrdir)/ruby/internal/constant_p.h
+new.o: $(hdrdir)/ruby/internal/core.h
+new.o: $(hdrdir)/ruby/internal/core/rarray.h
+new.o: $(hdrdir)/ruby/internal/core/rbasic.h
+new.o: $(hdrdir)/ruby/internal/core/rbignum.h
+new.o: $(hdrdir)/ruby/internal/core/rclass.h
+new.o: $(hdrdir)/ruby/internal/core/rdata.h
+new.o: $(hdrdir)/ruby/internal/core/rfile.h
+new.o: $(hdrdir)/ruby/internal/core/rhash.h
+new.o: $(hdrdir)/ruby/internal/core/robject.h
+new.o: $(hdrdir)/ruby/internal/core/rregexp.h
+new.o: $(hdrdir)/ruby/internal/core/rstring.h
+new.o: $(hdrdir)/ruby/internal/core/rstruct.h
+new.o: $(hdrdir)/ruby/internal/core/rtypeddata.h
+new.o: $(hdrdir)/ruby/internal/ctype.h
+new.o: $(hdrdir)/ruby/internal/dllexport.h
+new.o: $(hdrdir)/ruby/internal/dosish.h
+new.o: $(hdrdir)/ruby/internal/error.h
+new.o: $(hdrdir)/ruby/internal/eval.h
+new.o: $(hdrdir)/ruby/internal/event.h
+new.o: $(hdrdir)/ruby/internal/fl_type.h
+new.o: $(hdrdir)/ruby/internal/gc.h
+new.o: $(hdrdir)/ruby/internal/glob.h
+new.o: $(hdrdir)/ruby/internal/globals.h
+new.o: $(hdrdir)/ruby/internal/has/attribute.h
+new.o: $(hdrdir)/ruby/internal/has/builtin.h
+new.o: $(hdrdir)/ruby/internal/has/c_attribute.h
+new.o: $(hdrdir)/ruby/internal/has/cpp_attribute.h
+new.o: $(hdrdir)/ruby/internal/has/declspec_attribute.h
+new.o: $(hdrdir)/ruby/internal/has/extension.h
+new.o: $(hdrdir)/ruby/internal/has/feature.h
+new.o: $(hdrdir)/ruby/internal/has/warning.h
+new.o: $(hdrdir)/ruby/internal/intern/array.h
+new.o: $(hdrdir)/ruby/internal/intern/bignum.h
+new.o: $(hdrdir)/ruby/internal/intern/class.h
+new.o: $(hdrdir)/ruby/internal/intern/compar.h
+new.o: $(hdrdir)/ruby/internal/intern/complex.h
+new.o: $(hdrdir)/ruby/internal/intern/cont.h
+new.o: $(hdrdir)/ruby/internal/intern/dir.h
+new.o: $(hdrdir)/ruby/internal/intern/enum.h
+new.o: $(hdrdir)/ruby/internal/intern/enumerator.h
+new.o: $(hdrdir)/ruby/internal/intern/error.h
+new.o: $(hdrdir)/ruby/internal/intern/eval.h
+new.o: $(hdrdir)/ruby/internal/intern/file.h
+new.o: $(hdrdir)/ruby/internal/intern/hash.h
+new.o: $(hdrdir)/ruby/internal/intern/io.h
+new.o: $(hdrdir)/ruby/internal/intern/load.h
+new.o: $(hdrdir)/ruby/internal/intern/marshal.h
+new.o: $(hdrdir)/ruby/internal/intern/numeric.h
+new.o: $(hdrdir)/ruby/internal/intern/object.h
+new.o: $(hdrdir)/ruby/internal/intern/parse.h
+new.o: $(hdrdir)/ruby/internal/intern/proc.h
+new.o: $(hdrdir)/ruby/internal/intern/process.h
+new.o: $(hdrdir)/ruby/internal/intern/random.h
+new.o: $(hdrdir)/ruby/internal/intern/range.h
+new.o: $(hdrdir)/ruby/internal/intern/rational.h
+new.o: $(hdrdir)/ruby/internal/intern/re.h
+new.o: $(hdrdir)/ruby/internal/intern/ruby.h
+new.o: $(hdrdir)/ruby/internal/intern/select.h
+new.o: $(hdrdir)/ruby/internal/intern/select/largesize.h
+new.o: $(hdrdir)/ruby/internal/intern/set.h
+new.o: $(hdrdir)/ruby/internal/intern/signal.h
+new.o: $(hdrdir)/ruby/internal/intern/sprintf.h
+new.o: $(hdrdir)/ruby/internal/intern/string.h
+new.o: $(hdrdir)/ruby/internal/intern/struct.h
+new.o: $(hdrdir)/ruby/internal/intern/thread.h
+new.o: $(hdrdir)/ruby/internal/intern/time.h
+new.o: $(hdrdir)/ruby/internal/intern/variable.h
+new.o: $(hdrdir)/ruby/internal/intern/vm.h
+new.o: $(hdrdir)/ruby/internal/interpreter.h
+new.o: $(hdrdir)/ruby/internal/iterator.h
+new.o: $(hdrdir)/ruby/internal/memory.h
+new.o: $(hdrdir)/ruby/internal/method.h
+new.o: $(hdrdir)/ruby/internal/module.h
+new.o: $(hdrdir)/ruby/internal/newobj.h
+new.o: $(hdrdir)/ruby/internal/scan_args.h
+new.o: $(hdrdir)/ruby/internal/special_consts.h
+new.o: $(hdrdir)/ruby/internal/static_assert.h
+new.o: $(hdrdir)/ruby/internal/stdalign.h
+new.o: $(hdrdir)/ruby/internal/stdbool.h
+new.o: $(hdrdir)/ruby/internal/stdckdint.h
+new.o: $(hdrdir)/ruby/internal/symbol.h
+new.o: $(hdrdir)/ruby/internal/value.h
+new.o: $(hdrdir)/ruby/internal/value_type.h
+new.o: $(hdrdir)/ruby/internal/variable.h
+new.o: $(hdrdir)/ruby/internal/warning_push.h
+new.o: $(hdrdir)/ruby/internal/xmalloc.h
+new.o: $(hdrdir)/ruby/missing.h
+new.o: $(hdrdir)/ruby/ruby.h
+new.o: $(hdrdir)/ruby/st.h
+new.o: $(hdrdir)/ruby/subst.h
+new.o: new.c
 parse_depth_limit.o: $(RUBY_EXTCONF_H)
 parse_depth_limit.o: $(arch_hdrdir)/ruby/config.h
 parse_depth_limit.o: $(hdrdir)/ruby.h
diff --git a/ext/-test-/regexp/new.c b/ext/-test-/regexp/new.c
new file mode 100644
index 00000000000000..9e8c9854062ffe
--- /dev/null
+++ b/ext/-test-/regexp/new.c
@@ -0,0 +1,14 @@
+#include <ruby.h>
+
+static VALUE
+reg_new_binary(VALUE self, VALUE src)
+{
+    StringValue(src);
+    return rb_reg_new(RSTRING_PTR(src), RSTRING_LEN(src), 0);
+}
+
+void
+Init_new(VALUE klass)
+{
+    rb_define_singleton_method(klass, "new_binary", reg_new_binary, 1);
+}
diff --git a/ext/openssl/ossl_ssl.c b/ext/openssl/ossl_ssl.c
index 3d913a396844cf..27a811b5a716c7 100644
--- a/ext/openssl/ossl_ssl.c
+++ b/ext/openssl/ossl_ssl.c
@@ -56,7 +56,7 @@ static void
 ossl_sslctx_mark(void *ptr)
 {
     SSL_CTX *ctx = ptr;
-    rb_gc_mark((VALUE)SSL_CTX_get_ex_data(ctx, ossl_sslctx_ex_ptr_idx));
+    rb_gc_mark_movable((VALUE)SSL_CTX_get_ex_data(ctx, ossl_sslctx_ex_ptr_idx));
 }
 
 static void
@@ -65,12 +65,25 @@ ossl_sslctx_free(void *ptr)
     SSL_CTX_free(ptr);
 }
 
+static void
+ossl_sslctx_compact(void *ptr)
+{
+    SSL_CTX *ctx = ptr;
+    VALUE self = (VALUE)SSL_CTX_get_ex_data(ctx, ossl_sslctx_ex_ptr_idx);
+    if (self) {
+        (void)SSL_CTX_set_ex_data(ctx, ossl_sslctx_ex_ptr_idx,
+                                  (void *)rb_gc_location(self));
+    }
+}
+
 static const rb_data_type_t ossl_sslctx_type = {
-    "OpenSSL/SSL/CTX",
-    {
-        ossl_sslctx_mark, ossl_sslctx_free,
+    .wrap_struct_name = "OpenSSL/SSL/CTX",
+    .function = {
+        .dmark = ossl_sslctx_mark,
+        .dfree = ossl_sslctx_free,
+        .dcompact = ossl_sslctx_compact,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
 };
 
 static VALUE
@@ -1567,7 +1580,7 @@ static void
 ossl_ssl_mark(void *ptr)
 {
     SSL *ssl = ptr;
-    rb_gc_mark((VALUE)SSL_get_ex_data(ssl, ossl_ssl_ex_ptr_idx));
+    rb_gc_mark_movable((VALUE)SSL_get_ex_data(ssl, ossl_ssl_ex_ptr_idx));
 }
 
 static void
@@ -1576,12 +1589,25 @@ ossl_ssl_free(void *ssl)
     SSL_free(ssl);
 }
 
+static void
+ossl_ssl_compact(void *ptr)
+{
+    SSL *ssl = ptr;
+    VALUE self = (VALUE)SSL_get_ex_data(ssl, ossl_ssl_ex_ptr_idx);
+    if (self) {
+        (void)SSL_set_ex_data(ssl, ossl_ssl_ex_ptr_idx,
+                              (void *)rb_gc_location(self));
+    }
+}
+
 const rb_data_type_t ossl_ssl_type = {
-    "OpenSSL/SSL",
-    {
-        ossl_ssl_mark, ossl_ssl_free,
+    .wrap_struct_name = "OpenSSL/SSL",
+    .function = {
+        .dmark = ossl_ssl_mark,
+        .dfree = ossl_ssl_free,
+        .dcompact = ossl_ssl_compact,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
 };
 
 static VALUE
diff --git a/ext/openssl/ossl_x509store.c b/ext/openssl/ossl_x509store.c
index bed124dc3ed454..ee9f3d0e370eb2 100644
--- a/ext/openssl/ossl_x509store.c
+++ b/ext/openssl/ossl_x509store.c
@@ -116,10 +116,9 @@ static void
 ossl_x509store_mark(void *ptr)
 {
     X509_STORE *store = ptr;
-    // Note: this reference is stored as @verify_callback so we don't need to mark it.
-    // However we do need to ensure GC compaction won't move it, hence why
-    // we call rb_gc_mark here.
-    rb_gc_mark((VALUE)X509_STORE_get_ex_data(store, store_ex_verify_cb_idx));
+    VALUE verify_cb =
+        (VALUE)X509_STORE_get_ex_data(store, store_ex_verify_cb_idx);
+    rb_gc_mark_movable(verify_cb);
 }
 
 static void
@@ -128,12 +127,26 @@ ossl_x509store_free(void *ptr)
     X509_STORE_free(ptr);
 }
 
+static void
+ossl_x509store_compact(void *ptr)
+{
+    X509_STORE *store = ptr;
+    VALUE verify_cb =
+        (VALUE)X509_STORE_get_ex_data(store, store_ex_verify_cb_idx);
+    if (verify_cb) {
+        (void)X509_STORE_set_ex_data(store, store_ex_verify_cb_idx,
+                                     (void *)rb_gc_location(verify_cb));
+    }
+}
+
 static const rb_data_type_t ossl_x509store_type = {
-    "OpenSSL/X509/STORE",
-    {
-        ossl_x509store_mark, ossl_x509store_free,
+    .wrap_struct_name = "OpenSSL/X509/STORE",
+    .function = {
+        .dmark = ossl_x509store_mark,
+        .dfree = ossl_x509store_free,
+        .dcompact = ossl_x509store_compact,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
 };
 
 /*
@@ -570,10 +583,9 @@ static void
 ossl_x509stctx_mark(void *ptr)
 {
     X509_STORE_CTX *ctx = ptr;
-    // Note: this reference is stored as @verify_callback so we don't need to mark it.
-    // However we do need to ensure GC compaction won't move it, hence why
-    // we call rb_gc_mark here.
-    rb_gc_mark((VALUE)X509_STORE_CTX_get_ex_data(ctx, stctx_ex_verify_cb_idx));
+    VALUE verify_cb =
+        (VALUE)X509_STORE_CTX_get_ex_data(ctx, stctx_ex_verify_cb_idx);
+    rb_gc_mark_movable(verify_cb);
 }
 
 static void
@@ -585,12 +597,26 @@ ossl_x509stctx_free(void *ptr)
     X509_STORE_CTX_free(ctx);
 }
 
+static void
+ossl_x509stctx_compact(void *ptr)
+{
+    X509_STORE_CTX *ctx = ptr;
+    VALUE verify_cb =
+        (VALUE)X509_STORE_CTX_get_ex_data(ctx, stctx_ex_verify_cb_idx);
+    if (verify_cb) {
+        (void)X509_STORE_CTX_set_ex_data(ctx, stctx_ex_verify_cb_idx,
+                                         (void *)rb_gc_location(verify_cb));
+    }
+}
+
 static const rb_data_type_t ossl_x509stctx_type = {
-    "OpenSSL/X509/STORE_CTX",
-    {
-        ossl_x509stctx_mark, ossl_x509stctx_free,
+    .wrap_struct_name = "OpenSSL/X509/STORE_CTX",
+    .function = {
+        .dmark = ossl_x509stctx_mark,
+        .dfree = ossl_x509stctx_free,
+        .dcompact = ossl_x509stctx_compact,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
 };
 
 static VALUE
diff --git a/re.c b/re.c
index 68c6b45235f5b0..1d88ca02bbf542 100644
--- a/re.c
+++ b/re.c
@@ -3655,11 +3655,15 @@ rb_reg_equal(VALUE re1, VALUE re2)
     // src is a fstring, so a pointer comparison is enough
     RUBY_ASSERT(FL_TEST_RAW(RREGEXP_SRC(re1), RSTRING_FSTR));
     RUBY_ASSERT(FL_TEST_RAW(RREGEXP_SRC(re2), RSTRING_FSTR));
-    if (RREGEXP_SRC(re1) != RREGEXP_SRC(re2)) return Qfalse;
 
     if (FL_TEST(re1, KCODE_FIXED) != FL_TEST(re2, KCODE_FIXED)) return Qfalse;
     if (RREGEXP_PTR(re1)->options != RREGEXP_PTR(re2)->options) return Qfalse;
-    return RBOOL(ENCODING_GET(re1) == ENCODING_GET(re2));
+    if (RREGEXP_SRC_LEN(re1) != RREGEXP_SRC_LEN(re2)) return Qfalse;
+    if (ENCODING_GET(re1) != ENCODING_GET(re2)) return Qfalse;
+
+    if (RREGEXP_SRC(re1) == RREGEXP_SRC(re2)) return Qtrue;
+    if (RREGEXP_SRC_PTR(re1) == RREGEXP_SRC_PTR(re2)) return Qtrue;
+    return RBOOL(memcmp(RREGEXP_SRC_PTR(re1), RREGEXP_SRC_PTR(re2), RREGEXP_SRC_LEN(re1)) == 0);
 }
 
 /*
diff --git a/test/ruby/test_optimization.rb b/test/ruby/test_optimization.rb
index d34e490d589126..4e9fd5cf0bdd27 100644
--- a/test/ruby/test_optimization.rb
+++ b/test/ruby/test_optimization.rb
@@ -1047,6 +1047,21 @@ def x.bug
     assert_equal(:ok, x.bug)
   end
 
+  def test_peephole_branch_dup_with_label_after_dup
+    assert_ruby_status [], <<-END
+      src = <<~'SRC'
+        $g&.call&.to_s
+        [*d, [__dir__].each(&:each), C1.value(/ab/o, &b)].each {}
+        begin
+          ((-243 != qux) ? (1..2) : 8i&.value) => ^([1].select(&:to_s))
+        rescue
+          ((-243 != qux) ? (1..2) : 8i&.value) => ^([1].select(&:to_s))
+        end
+      SRC
+      RubyVM::InstructionSequence.compile(src)
+    END
+  end
+
   def test_peephole_jump_after_newarray
     i = 0
     %w(1) || 2 while (i += 1) < 100
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index cf989615e031f1..250956dd3a009d 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -938,6 +938,13 @@ def test_eqq
     assert_equal(false, /../ === nil)
   end
 
+  def test_eql
+    require '-test-/regexp'
+  rescue LoadError
+  else
+    assert_equal(/^[0-9]/, Bug::Regexp.new_binary("^[0-9]"))
+  end
+
   def test_quote
     assert_equal("\xff", Regexp.quote([0xff].pack("C")))
     assert_equal("\\ ", Regexp.quote("\ "))