InfoType for pointers

[marler8997]

Related Proposal: #2907 (ability to create primitive types from TypeInfo, but not necessarily aggregate types)

A standard library implementation of a function that can convert TypeInfo values to their corresponding type value.

Currently I've only implemented the Pointer subset. If this solution is accepted, then we can expand it to other types as well.

[daurnimator]

I think this was intended to be done as a builtin?

[marler8997]

@daurnimator correct. Here is what it would look like if it was implemented in the standard library. At least a preview. The complete implementation for all types that "make sense" (see #2907 (comment)) to implement would be larger.

In the D community people tend to prefer standard library changes over changes to the language itself. I figured I would put together a standard library solution for comparison. Though, I'm not sure what all the pros/cons of a language vs library solution would be.

[marler8997]

I'm going to guess that the builtin will be preferred so closing this one.