Null-coalescing operator and lambda expression

Question

take a look at the following code I attempted to write inside a constructor:

private Predicate _isValid;

//...

Predicate isVali         


        

Answer 1

this._isValid = isValid ?? (s => true);

Will work :)

It parsed it this way:

this._isValid = (isValid ?? s) => true;

which does not make any sense.