Use of demangle from std.demangle or core.demangle on the mangled
names in an object or library generated by dmd works only on the
names of functions, and not on the names of types embedded in
such objects and libraries.
e.g. the following names are not demangled, being type names
(ending in Z).
Opinion: D should do the right thing and have the facility to
demangle all of its own mangled names; no-one else will.