This is a bit complicated. Originally intention was to deprecate
scope variables (scope var = new Class) completely and make
people switch to std.typecons.scoped - primarily because of how
fragile and inflexible its implementation was (can't have scope
fields in aggregates for example)
However it never actually got deprecated and still kind of works
with no warnings printed by compiler. Also I remember Daniel
mentioning that he uses it extensively in DDMD project which,
unfortunately, makes full deprecation unlikely.
There is however a long standing desire to re-purpose `scope` as
qualifier for lifetime/ownership semantics which could have made
current uses simply a subset of full `scope` implementation. But
this is very complicated topic and may take years to fly.
