Merge pull request #72 from khataev/frozen-string-literal-fix

Fix issue with 'from' clause and frozen_string_literal magic comment

lib/roxml/definition.rb

@@ -60,7 +60,7 @@ def initialize(sym, opts = {}, &block)
         @sought_type = :namespace
       elsif opts[:from].to_s.starts_with?('@')
         @sought_type = :attr
-        opts[:from].sub!('@', '')
+        opts[:from] = opts[:from].sub('@', '')
       end
 
       @name = @attr_name = accessor.to_s.chomp('?')

spec/definition_spec.rb

@@ -426,7 +426,6 @@ def self.from_xml(val)
   end
 
   describe "options" do
-
     shared_examples_for "boolean option" do
       it "should be recognized" do
         ROXML::Definition.new(:author, :from => :content, @option => true).respond_to?(:"#{@option}?")
@@ -468,4 +467,10 @@ def self.from_xml(val)
       it_should_behave_like "boolean option"
     end
   end
+
+  describe 'frozen_string_literal behavior' do
+    it 'should not raise error' do
+      expect { ROXML::Definition.new(:element, :from => '@somewhere'.freeze) }.not_to raise_error(FrozenError)
+    end
+  end
 end