Shorter method to change null value

[frodegil]

Hi C# team

Instead of

nullableVariable = nullableVariable ?? "Default non-null value";

it would be nice to just use a short-circuit

nullableVariable ??= "Default non-null value";

[svick]

That code is already valid in the current C# 8.0 preview and so it should work in the final version of C# 8.0, which is planned to be released next month.

For more details, see #34.

[YairHalberstadt]

Closing as implemented