const class sys::NullErr

sys::Obj
  sys::Err
    sys::NullErr

Source

NullErr indicates an attempt to dereference null. It is often raised when attempting to access an instance field or method on a null reference. It may also be thrown when a parameter is expecting a non-nullable argument and null is passed.

make

new make(Str msg := "", Err? cause := null)

Source

Construct with specified error message and optional root cause.