https://git.ruby-lang.org/ruby.git/commit/?id=68b5f14d53

From 68b5f14d536c1a81c63412a9f3701380c9bc116c Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@u...>
Date: Wed, 16 Sep 2020 19:27:16 +0900
Subject: Fix assertion failed in Complex.polar without NDEBUG (#3551)

Fixes [Bug #17172].

diff --git a/complex.c b/complex.c
index b8dd616..4100fac 100644
--- a/complex.c
+++ b/complex.c
@@ -732,6 +732,14 @@ nucomp_s_polar(int argc, VALUE *argv, VALUE klass) https://github.com/ruby/ruby/blob/trunk/complex.c#L732
 	nucomp_real_check(arg);
 	break;
     }
+    if (RB_TYPE_P(abs, T_COMPLEX)) {
+        get_dat1(abs);
+        abs = dat->real;
+    }
+    if (RB_TYPE_P(arg, T_COMPLEX)) {
+        get_dat1(arg);
+        arg = dat->real;
+    }
     return f_complex_polar(klass, abs, arg);
 }
 
diff --git a/test/ruby/test_complex.rb b/test/ruby/test_complex.rb
index a4fe9d4..a3a7546 100644
--- a/test/ruby/test_complex.rb
+++ b/test/ruby/test_complex.rb
@@ -220,6 +220,11 @@ class Complex_Test < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_complex.rb#L220
   def test_polar
     assert_equal([1,2], Complex.polar(1,2).polar)
     assert_equal(Complex.polar(1.0, Math::PI * 2 / 3), Complex.polar(1, Math::PI * 2 / 3))
+
+    assert_in_out_err([], <<-'end;', ['OK'], [])
+      Complex.polar(1, Complex(1, 0))
+      puts :OK
+    end;
   end
 
   def test_uplus
-- 
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