Add support for case edge case
Add support for emitting empty masgn right nodes
Fix masgn abiguities and empty expressions in array literals
Emit return with splat arguments correctly
Emit optarg with empty expressions correctly
Use a blacklist instead of a whitelist for save non empty parens on empty begin nodes
Share emitters for break, next and return
Correct emitter for unary operators with low precedence
Reproduce ++1 correctly
Emit blockarg from expression correctly
Remove explicit block if possible
Externalize strip helper
Mark parser-2.1.3 bug related specs as pending