https://git.ruby-lang.org/ruby.git/commit/?id=f4386413f1

From f4386413f16f9e492a74f6b65e981e20e22c4849 Mon Sep 17 00:00:00 2001
From: Robert Schulze <robert@d...>
Date: Wed, 5 Feb 2020 10:59:13 +0100
Subject: Cope with frozen-string-literal

When running irb 1.2.1 (2019-12-24) with frozen-string-literal enabled, it crashes in reline with `can't modify frozen String (FrozenError)`

Steps to reproduce:

`RUBYOPT="--enable-frozen-string-literal" irb`

diff --git a/lib/reline/ansi.rb b/lib/reline/ansi.rb
index 0b1a7e1..0fddbcc 100644
--- a/lib/reline/ansi.rb
+++ b/lib/reline/ansi.rb
@@ -172,7 +172,7 @@ class Reline::ANSI https://github.com/ruby/ruby/blob/trunk/lib/reline/ansi.rb#L172
 
   def self.cursor_pos
     begin
-      res = ''
+      res = String.new
       m = nil
       @@input.raw do |stdin|
         @@output << "\e[6n"
-- 
cgit v0.10.2


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