https://git.ruby-lang.org/ruby.git/commit/?id=0aafc32995

From 0aafc32995b935b6c46c8439a3e2da008cd683fc Mon Sep 17 00:00:00 2001
From: sonots <sonots@g...>
Date: Fri, 22 Mar 2019 01:14:14 +0900
Subject: [ruby/logger] frozen_string_literal: true

https://github.com/ruby/logger/commit/a057eede7b

diff --git a/lib/logger.rb b/lib/logger.rb
index aff2ad4..46cc6cf 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -237,7 +237,7 @@ class Logger https://github.com/ruby/ruby/blob/trunk/lib/logger.rb#L237
     name = File.basename(__FILE__)
   end
   rev ||= "v#{VERSION}"
-  ProgName = "#{name}/#{rev}".freeze
+  ProgName = "#{name}/#{rev}"
 
   include Severity
 
@@ -574,7 +574,7 @@ class Logger https://github.com/ruby/ruby/blob/trunk/lib/logger.rb#L574
 private
 
   # Severity label for logging (max 5 chars).
-  SEV_LABEL = %w(DEBUG INFO WARN ERROR FATAL ANY).each(&:freeze).freeze
+  SEV_LABEL = %w(DEBUG INFO WARN ERROR FATAL ANY).freeze
 
   def format_severity(severity)
     SEV_LABEL[severity] || 'ANY'
diff --git a/lib/logger/errors.rb b/lib/logger/errors.rb
index 8095acc..e8925e1 100644
--- a/lib/logger/errors.rb
+++ b/lib/logger/errors.rb
@@ -1,3 +1,5 @@ https://github.com/ruby/ruby/blob/trunk/lib/logger/errors.rb#L1
+# frozen_string_literal: true
+
 # not used after 1.2.7. just for compat.
 class Logger
   class Error < RuntimeError # :nodoc:
diff --git a/lib/logger/formatter.rb b/lib/logger/formatter.rb
index 13cb1a8..206c35d 100644
--- a/lib/logger/formatter.rb
+++ b/lib/logger/formatter.rb
@@ -1,7 +1,9 @@ https://github.com/ruby/ruby/blob/trunk/lib/logger/formatter.rb#L1
+# frozen_string_literal: true
+
 class Logger
   # Default formatter for log messages.
   class Formatter
-    Format = "%s, [%s#%d] %5s -- %s: %s\n".freeze
+    Format = "%s, [%s#%d] %5s -- %s: %s\n"
 
     attr_accessor :datetime_format
 
@@ -17,7 +19,7 @@ class Logger https://github.com/ruby/ruby/blob/trunk/lib/logger/formatter.rb#L19
   private
 
     def format_datetime(time)
-      time.strftime(@datetime_format || "%Y-%m-%dT%H:%M:%S.%6N ".freeze)
+      time.strftime(@datetime_format || "%Y-%m-%dT%H:%M:%S.%6N ")
     end
 
     def msg2str(msg)
@@ -25,8 +27,7 @@ class Logger https://github.com/ruby/ruby/blob/trunk/lib/logger/formatter.rb#L27
       when ::String
         msg
       when ::Exception
-        "#{ msg.message } (#{ msg.class })\n" <<
-          (msg.backtrace || []).join("\n")
+        "#{ msg.message } (#{ msg.class })\n#{ (msg.backtrace || []).join("\n") }"
       else
         msg.inspect
       end
diff --git a/lib/logger/log_device.rb b/lib/logger/log_device.rb
index 5661f5c..fe7d54f 100644
--- a/lib/logger/log_device.rb
+++ b/lib/logger/log_device.rb
@@ -1,3 +1,5 @@ https://github.com/ruby/ruby/blob/trunk/lib/logger/log_device.rb#L1
+# frozen_string_literal: true
+
 require_relative 'period'
 
 class Logger
diff --git a/lib/logger/period.rb b/lib/logger/period.rb
index bb8cffc..76a8c3b 100644
--- a/lib/logger/period.rb
+++ b/lib/logger/period.rb
@@ -1,3 +1,5 @@ https://github.com/ruby/ruby/blob/trunk/lib/logger/period.rb#L1
+# frozen_string_literal: true
+
 class Logger
   module Period
     module_function
diff --git a/lib/logger/severity.rb b/lib/logger/severity.rb
index c8179cb..b38afb7 100644
--- a/lib/logger/severity.rb
+++ b/lib/logger/severity.rb
@@ -1,3 +1,5 @@ https://github.com/ruby/ruby/blob/trunk/lib/logger/severity.rb#L1
+# frozen_string_literal: true
+
 class Logger
   # Logging severity.
   module Severity
-- 
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