From 816bbfdc87d4a5f600f28cf4b0eaa5161af80645 Mon Sep 17 00:00:00 2001
From: zverok <zverok.offline@gmail.com>
Date: Mon, 21 Dec 2020 23:15:47 +0200
Subject: [PATCH] Document Proc#==

---
 proc.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/proc.c b/proc.c
index 749b6a8134..06a6b80649 100644
--- a/proc.c
+++ b/proc.c
@@ -1273,6 +1273,32 @@ rb_proc_get_iseq(VALUE self, int *is_proc)
     return NULL;
 }
 
+/* call-seq:
+ *   prc == other -> true or false
+ *   prc.eql?(other) -> true or false
+ *
+ * Two proc are the same if, and only if, they were created from the same code block.
+ *
+ *   def return_block(&block)
+ *     block
+ *   end
+ *
+ *   def pass_block_twice(&block)
+ *     [return_block(&block), return_block(&block)]
+ *   end
+ *
+ *   block1, block2 = pass_block_twice { puts 'test' }
+ *   # Blocks might be instantiated into Proc's lazily, so they may, or may not,
+ *   # be the same object.
+ *   # But they are produced from the same code block, so they are equal
+ *   block1 == block2
+ *   #=> true
+ *
+ *   # Another Proc will never be equal, even if the code is the "same"
+ *   block1 == proc { puts 'test' }
+ *   #=> false
+ *
+ */
 static VALUE
 proc_eq(VALUE self, VALUE other)
 {