Nathan Shively-Sanders a772c26a71
Error when property is specified more than once via a spread (#36727)
* add tests but not baselines or fixes

* Update original change

Still probably wrong; probably doesn't even compile beacuse I'm just
typing on my laptop.

* fix error code ok

* notes to self

* Error: property is specified more than once via spread

* make jsx tests stricter

* update semicolon error message

* use ?. because it is great

* use maybeTypeOfKind in new code

* restore jsx error

* add tests
2020-02-11 10:23:15 -08:00
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