On Wednesday, 21 September 2016 at 13:10:53 UTC, w0rp wrote:

Assignment of null to a type T is forbidden. Assignment to a type T? forms a fence, which would imply an atomic fence. When a type T is assigned to a variable of type T?, then after that line of code, the value can be considered to be of type T. When a type T? is re-assigned to a variable value, then the null safety checks will be applied again, and either another assignment expression or condition must be used before access is made.

hello, i saw something like this in Ceylon and Kotlin

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