SetLocal and SetGlobal can be statements and expressions. We have implemented them as statements but haven't implemented them as expressions.
Created attachment 261606 [details] Patch
Comment on attachment 261606 [details] Patch r=me
Comment on attachment 261606 [details] Patch Clearing flags on attachment: 261606 Committed r190043: <http://trac.webkit.org/changeset/190043>
All reviewed patches have been landed. Closing bug.