erb.rb: fronzen-string-literal in comment [Fix GH-1229]

* lib/erb.rb (ERB::Compiler#detect_magic_comment): allow
  fronzen-string-literal in comment as well as encoding.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53685 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 0 deletions

diff --git a/test/erb/test_erb.rb b/test/erb/test_erb.rb
index f80e0e947b..6a07f9c5cb 100644
--- a/test/erb/test_erb.rb
+++ b/test/erb/test_erb.rb
@@ -530,6 +530,11 @@ EOS
       '# -*- \1; frozen-string-literal: true -*-'
     }
     assert_equal("a", e.result, bug12031)
+
+    %w(false true).each do |flag|
+      erb = @erb.new("<%#frozen-string-literal: #{flag}%><%=''.frozen?%>")
+      assert_equal(flag, erb.result)
+    end
   end
 end