Comma not enforced for third+ array elements

[jbeda]

This works:

$ ./jsonnet -e '[1, 2 3]'
[
   1,
   2,
   3
]

I would expect to see an error.

We need to reset get_comma to false (and implement at test) in parseTerminal around here: https://github.com/google/jsonnet/blob/master/core/parser.cpp#L951.

[sparkprime]

Heh, looks like I accidentally fixed this in my reformatter branch.

[sparkprime]

Yeah there's code to reset it in the branch here
https://github.com/google/jsonnet/blob/fmt/core/parser.cpp#L582