"""A metamodel expression, that is, a typed reference to a type, class, function or value.
Examples:
`List<String>`
`sum<Float>`
`system.milliseconds`
Not to be confused with [[Dec]], which represents a *detyped* reference.
Simply speaking, if there’s a keyword (`` `class String` ``, `` `value system` ``),
then it’s a [[Dec]], otherwise it’s a [[Meta]]."""
shared abstract class Meta()
of TypeMeta | BaseMeta | MemberMeta
extends Primary() {
}