Error due to passing positional arguments to a default constructor
class X::Constructor::Positional is Exception { }
Thrown from Mu.new when positional arguments are passed to it.
For example
class A { };
A.new(2, 3);
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: Ā«X::Constructor::Positional: Default constructor for 'A' only takes named argumentsā¤Ā»