On 09/14/2018 04:01 AM, Simon Proctor wrote:
:D is a type constraint requiring an instantiated (or defined) object of the given type (or a subtype of it).

:U is a type constraint saying you have a container specified for the given type that hasn't been instantiated.

Hi Simon,

Your went over my head.  What the heck is "instantiated"?

https://www.dictionary.com/browse/instantiate
verb (used with object), in·stan·ti·at·ed, in·stan·ti·at·ing.

    to provide an instance of or concrete evidence in support
    of (a theory, concept, claim, or the like).

I am not connecting the dots.

Is there a list of these guys somewhere, or are these the only two?

-T

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