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Date: Wed, 2 Dec 2015 01:47:16 +0000
From: Eric Wong <normalperson@yhbt.net>
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 <redmine.journal-55195.20151202013052.a969f83c8794e974@ruby-lang.org>
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Subject: [ruby-core:71788] Re: [Ruby trunk - Bug #11759] URI breaks with
 frozen strings
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Hi David, a new problem is to_s now returns a frozen string.
This has the potential to break many existing callers of to_s.

Perhaps the following (untested) one-liner is enough?

--- a/lib/uri/generic.rb
+++ b/lib/uri/generic.rb
@@ -1339,7 +1339,7 @@ def normalize!
     # Constructs String from URI
     #
     def to_s
-      str = ''
+      str = ''.freeze.dup
       if @scheme
         str << @scheme
         str << ':'.freeze

I added the extra 'freeze' instead of just calling 'dup' to avoid
allocating the extra object when frozen string literals are not
enabled.

But yeah, problems like this is why I remain against frozen string
literals for 3.0 (but I'm alright with the opt-in magic comment).