https://git.ruby-lang.org/ruby.git/commit/?id=2b07b24bdf

From 2b07b24bdf15e4feeb9dae94a17999070cd77121 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 7 Sep 2020 18:56:39 +0900
Subject: Added `rb_random_base_init`

To enclose the initialization of Random::Base part.

diff --git a/ext/-test-/random/loop.c b/ext/-test-/random/loop.c
index 4f7c800..ec4eff0 100644
--- a/ext/-test-/random/loop.c
+++ b/ext/-test-/random/loop.c
@@ -38,7 +38,7 @@ loop_alloc(VALUE klass) https://github.com/ruby/ruby/blob/trunk/ext/-test-/random/loop.c#L38
 {
     rand_loop_t *rnd;
     VALUE obj = TypedData_Make_Struct(klass, rand_loop_t, &random_loop_type, rnd);
-    rnd->base.seed = INT2FIX(0);
+    rb_random_base_init(&rnd->base);
     return obj;
 }
 
diff --git a/include/ruby/random.h b/include/ruby/random.h
index 1d45dc2..2e7ac75 100644
--- a/include/ruby/random.h
+++ b/include/ruby/random.h
@@ -71,6 +71,7 @@ typedef const rb_data_type_t rb_random_data_type_t; https://github.com/ruby/ruby/blob/trunk/include/ruby/random.h#L71
 #endif
 
 void rb_random_mark(void *ptr);
+void rb_random_base_init(rb_random_t *rnd);
 double rb_int_pair_to_real(uint32_t a, uint32_t b, int excl);
 void rb_rand_bytes_int32(rb_random_get_int32_func *, rb_random_t *, void *, size_t);
 RUBY_EXTERN const rb_data_type_t rb_random_data_type;
diff --git a/random.c b/random.c
index 4ceff37..587e93c 100644
--- a/random.c
+++ b/random.c
@@ -297,12 +297,19 @@ try_rand_if(VALUE obj, rb_random_t *rnd) https://github.com/ruby/ruby/blob/trunk/random.c#L297
 }
 
 /* :nodoc: */
+void
+rb_random_base_init(rb_random_t *rnd)
+{
+    rnd->seed = INT2FIX(0);
+}
+
+/* :nodoc: */
 static VALUE
 random_alloc(VALUE klass)
 {
     rb_random_mt_t *rnd;
     VALUE obj = TypedData_Make_Struct(klass, rb_random_mt_t, &random_mt_type, rnd);
-    rnd->base.seed = INT2FIX(0);
+    rb_random_base_init(&rnd->base);
     return obj;
 }
 
-- 
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