Warning - Bug introduced in nightly since 2017-06-20


There is a bug introduced in nightly 2017-06-20. (this does not impact stable).
You might want to consider sticking to 2017-06-18 for a while.

The issue is already tracked in #42903 .

The bug can be reproduced with the following code.


Issue link for the lazy:


The issue has been fixed. Rejoice!