enumeration of iterables

[natebrennand]

Proposal:

when iterating using a for block, catching two variables turns it into an enumeration. When iterating over a dictionary, (key, value) pairs are yielded.

for (/* type */ /* id */ in /* list expr */) {
    // statements
}

// and also for lists:
for (Int /* id */, /* type */ /* id */ in /* list expr */) {
    // statements
}

// and also for dictionaries:
for (/* key type */ /* id */, /* value type */ /* id */ in /* dict */) {
    // statements
}

[brishin]

Sounds good to me