Jira (PUP-3744) Function to dig out allowed values for an attribute of a type

Title: Message Title

Daniele Sluijters created an issue

PUP-3744

What I want to be able to do is ask a type what the allowed values for one of its attributes is, if of course that has been specified in the type.

The reason for doing so is that this can then be used to construct a type definition to be used as an annotation in the future parser:

Consider a defined type which wraps around a file:

define my_file *

  $ensure =  'file',

) {}

Now I need to manually validate the values for $ensure but I know what they should be, the same as file's ensure values.

Instead it would make sense to be able to say "I accept all values that this attribute of that type accepts".

type my_type = attribute_type(File, 'ensure') // this returns an Enum or other type definition

define my_file (

  My_type $ensure,

) {}

It would also be pretty neat if the built-in types would all emit types named along the lines of Type_attribute that can be used as is.

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