Documentation for method
why assembled from the following types:
method why(--> Str)
Returns the reason why that attribute is required, and it will be included in the message if provided. That reason is taken directly from the
is required trait.
my;my = Uses-required.new(); │# OUTPUT:# «(exit code 1) The attribute '$!req' is required because because yes,␤# but you did not provide a value for it.␤»