* lib/net/imap.rb: use frozen_string_literal: true.

* test/net/imap/test_imap.rb: ditto.

* test/net/imap/test_imap_response_parser.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52093 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

4 files changed, 22 insertions, 6 deletions

diff --git a/ChangeLog b/ChangeLog
index 1a873d1195..bebd009a9f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Fri Oct  9 16:42:26 2015  Shugo Maeda  <[email protected]>
+
+	* lib/net/imap.rb: use frozen_string_literal: true. 
+
+	* test/net/imap/test_imap.rb: ditto.
+
+	* test/net/imap/test_imap_response_parser.rb: ditto.
+
 Fri Oct  9 15:52:28 2015  Shugo Maeda  <[email protected]>
 
 	* lib/net/ftp.rb: use frozen_string_literal: true.
diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 1cf7aa4ee2..cc7935ec43 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -1,4 +1,6 @@
 #
+# -*- frozen_string_literal: true -*-
+#
 # = net/imap.rb
 #
 # Copyright (C) 2000  Shugo Maeda <[email protected]>
@@ -1191,7 +1193,7 @@ module Net
     end
 
     def get_response
-      buff = ""
+      buff = String.new
       while true
         s = @sock.gets(CRLF)
         break unless s
@@ -2729,7 +2731,7 @@ module Net
       end
 
       def section
-        str = ""
+        str = String.new
         token = match(T_LBRA)
         str.concat(token.value)
         token = match(T_ATOM, T_NUMBER, T_RBRA)
@@ -3210,7 +3212,7 @@ module Net
       end
 
       def atom
-        result = ""
+        result = String.new
         while true
           token = lookahead
           if atom_token?(token)
diff --git a/test/net/imap/test_imap.rb b/test/net/imap/test_imap.rb
index da3353393c..bf57aa5cc4 100644
--- a/test/net/imap/test_imap.rb
+++ b/test/net/imap/test_imap.rb
@@ -1,3 +1,6 @@
+#
+# -*- frozen_string_literal: true -*-
+
 require "net/imap"
 require "test/unit"
 
@@ -26,13 +29,13 @@ class IMAPTest < Test::Unit::TestCase
     assert_equal("foo", Net::IMAP.encode_utf7("foo"))
     assert_equal("&-", Net::IMAP.encode_utf7("&"))
 
-    utf8 = "\357\274\241\357\274\242\357\274\243".force_encoding("UTF-8")
+    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
     s = Net::IMAP.encode_utf7(utf8)
     assert_equal("&,yH,Iv8j-", s)
     s = Net::IMAP.encode_utf7("foo&#{utf8}-bar".encode("EUC-JP"))
     assert_equal("foo&-&,yH,Iv8j--bar", s)
 
-    utf8 = "\343\201\202&".force_encoding("UTF-8")
+    utf8 = "\343\201\202&".dup.force_encoding("UTF-8")
     s = Net::IMAP.encode_utf7(utf8)
     assert_equal("&MEI-&-", s)
     s = Net::IMAP.encode_utf7(utf8.encode("EUC-JP"))
@@ -44,7 +47,7 @@ class IMAPTest < Test::Unit::TestCase
     assert_equal("&-", Net::IMAP.decode_utf7("&--"))
 
     s = Net::IMAP.decode_utf7("&,yH,Iv8j-")
-    utf8 = "\357\274\241\357\274\242\357\274\243".force_encoding("UTF-8")
+    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
     assert_equal(utf8, s)
   end
 
diff --git a/test/net/imap/test_imap_response_parser.rb b/test/net/imap/test_imap_response_parser.rb
index 1612d78e87..1104a490fa 100644
--- a/test/net/imap/test_imap_response_parser.rb
+++ b/test/net/imap/test_imap_response_parser.rb
@@ -1,3 +1,6 @@
+#
+# -*- frozen_string_literal: true -*-
+
 require "net/imap"
 require "test/unit"