Assigning null to a NullRestricted field correctly results in an NullPointerException.
However, the message is misleading. For example,

`java.lang.NullPointerException: Cannot assign field "empty" because "this" is null`

The confusing part is the reference to "this" when it should be referring to the local variable.

The message is from JEP 358: Helpful NullPointerExceptions

public value class Value {
        @NullRestricted
        EmptyValue empty;
        
        Value(EmptyValue empty) {
            this.empty = empty;
        }
}
Invoke as
`new Value(null)`