https://git.ruby-lang.org/ruby.git/commit/?id=5b1fd79ad9

From 5b1fd79ad90899adc71a1f34a722b26ba22a9c8a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 25 Sep 2019 20:51:20 +0900
Subject: [DOC] fixed the return value of IO#ready? [ci skip]

IO#ready? returns true or false only, since r50262(1baa57b0033).

diff --git a/ext/io/wait/wait.c b/ext/io/wait/wait.c
index f7a7508..d846bba 100644
--- a/ext/io/wait/wait.c
+++ b/ext/io/wait/wait.c
@@ -95,10 +95,9 @@ io_nread(VALUE io) https://github.com/ruby/ruby/blob/trunk/ext/io/wait/wait.c#L95
 
 /*
  * call-seq:
- *   io.ready? -> true, false or nil
+ *   io.ready? -> true or false
  *
  * Returns true if input available without blocking, or false.
- * Returns nil if no information available.
  */
 
 static VALUE
-- 
cgit v0.10.2


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