Recursive destructuring #464
destructured pattern in iterator #464
allow null generator #464
destructuring in comprehension iterators #464
store declarations in a set #464
destructuring in let expressions #464
document this new class
tests for #463
Minor (probably incorrect) code change to make things compile
nonempty/exists destructuring #464
Merge branch 'master' into destructure2
Merge branch 'destructure2'