https://git.ruby-lang.org/ruby.git/commit/?id=7cf37a5722

From 7cf37a57221c085aaf29e260060ea0e709af1e93 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 17 Oct 2022 12:00:39 +0900
Subject: [DOC] Add the polar form in String#to_c

---
 complex.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/complex.c b/complex.c
index 07e5914d54..18d61b206f 100644
--- a/complex.c
+++ b/complex.c
@@ -2026,6 +2026,12 @@ string_to_c_strict(VALUE self, int raise) https://github.com/ruby/ruby/blob/trunk/complex.c#L2026
  *    '1/2+3/4i'.to_c    #=> ((1/2)+(3/4)*i)
  *    'ruby'.to_c        #=> (0+0i)
  *
+ * Polar form:
+ *    include Math
+ *    "1.0@0".to_c        #=> (1+0.0i)
+ *    "1.0@#{PI/2}".to_c  #=> (0.0+1i)
+ *    "1.0@#{PI}".to_c    #=> (-1+0.0i)
+ *
  * See Kernel.Complex.
  */
 static VALUE
-- 
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