`r[i]?{} += {1}` breaks about rascal HOT 2 CLOSED

We've fixed += a few times, I'm not sure why it keeps breaking. Anyway,
something to look into.

Jurgen J. Vinju wrote:

There is a type-check error in |r[i]?{} += {1}|, since you can not add
elements to |set[void]|

People work around this as follows:

|set[int] init = {};
r[i]?init += {1};
|

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#32.

from rascal.

This works fine now.

from rascal.