https://git.ruby-lang.org/ruby.git/commit/?id=68ffb679d4

From 68ffb679d461722da6ef0bcdb2f18d8929d98204 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 14 Sep 2019 00:41:04 +0900
Subject: Undefine DSUSP key

Enable `Ctrl+Y`, which is bound with it by default on BSD-like
systems, for editing.

diff --git a/lib/reline/ansi.rb b/lib/reline/ansi.rb
index a3401b9..9d9f79f 100644
--- a/lib/reline/ansi.rb
+++ b/lib/reline/ansi.rb
@@ -115,9 +115,13 @@ class Reline::ANSI https://github.com/ruby/ruby/blob/trunk/lib/reline/ansi.rb#L115
     int_handle = Signal.trap('INT', 'IGNORE')
     otio = `stty -g`.chomp
     setting = ' -echo -icrnl cbreak'
-    if /-parenb\b/ =~ `stty -a`
+    stty = `stty -a`
+    if /-parenb\b/ =~ stty
       setting << ' pass8'
     end
+    if /\bdsusp *=/ =~ stty
+      setting << ' dsusp undef'
+    end
     setting << ' -ixoff'
     `stty #{setting}`
     Signal.trap('INT', int_handle)
-- 
cgit v0.10.2


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