Spec to check encoding remains the same after ARGF read and gets
ARGF Binmode should set the file encoding to ASCII-8BIT
Untag implemented specs
Add specs for String#insert and resulting encoding
Fix String#insert for changing encodings and compatibility
Merge pull request #2521 from anupnivargi/argf_spec

ARGF Binmode should set the file encoding to ASCII-8BIT
Add spec for defined? with a literal array
Add compiler spec for defined? with array literals
Fix defined? with an array literal

This iterates over all elements in the Array and calls defined? on them.
Add a Module#module_function spec
Fix Module#module_function on Class
Simplify a Module#included spec
Add a Module#append_features spec
Add a Module#extend_object spec
Fix Module#{append_features,extend_object} on Class
Add Module#prepend_features specs

related ruby/ruby#376
Fix Module#prepend_features
Add a Module#prepend spec
Fix Module#prepend visibility
Write a Module#prepended spec