https://git.ruby-lang.org/ruby.git/commit/?id=a55eb9a2af

From a55eb9a2af7950d180d9d31ffde2bce66710f44f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 23 Jan 2021 10:28:07 +0900
Subject: Make reciprocal properly of non-integral rational [Bug #17572]

---
 rational.c                 | 2 +-
 test/ruby/test_rational.rb | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/rational.c b/rational.c
index 4a7df25..8548b3b 100644
--- a/rational.c
+++ b/rational.c
@@ -1868,7 +1868,7 @@ VALUE https://github.com/ruby/ruby/blob/trunk/rational.c#L1868
 rb_rational_reciprocal(VALUE x)
 {
     get_dat1(x);
-    return f_rational_new_no_reduce2(CLASS_OF(x), dat->den, dat->num);
+    return nurat_convert(CLASS_OF(x), dat->den, dat->num, FALSE);
 }
 
 /*
diff --git a/test/ruby/test_rational.rb b/test/ruby/test_rational.rb
index 820dd30..fe9de64 100644
--- a/test/ruby/test_rational.rb
+++ b/test/ruby/test_rational.rb
@@ -613,6 +613,13 @@ class Rational_Test < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rational.rb#L613
     assert_nothing_raised(TypeError, '[Bug #5020] [ruby-dev:44088]') do
       Rational(1,2).coerce(Complex(1,1))
     end
+
+    assert_raise(ZeroDivisionError) do
+      1 / 0r.coerce(0+0i)[0]
+    end
+    assert_raise(ZeroDivisionError) do
+      1 / 0r.coerce(0.0+0i)[0]
+    end
   end
 
   class ObjectX
-- 
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