he/him 
@caitp88 It should work with the same completion record semantics that eval uses iirc.
@caitp88 Some helpful links (if you haven't found them already): https://github.com/babel/babel/issues/1994 … https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-01/jan-29.md#do-expression … https://webcache.googleusercontent.com/search?q=cache:MIGALjqPDNgJ:wiki.ecmascript.org/doku.php%3Fid%3Dstrawman:do_expressions+&cd=1&hl=en&ct=clnk&gl=us …