Is there a way to determine whether a given symbol is an alias?
Consider this:
```
module funcs;
alias FuncPtr = void function();
@ChooseMe FuncPtr funcPtr;
alias anotherName = funcPtr;
```
Handing this module off to __traits(allMembers), then checking
for the UDA on each member, I can filter out FuncPtr just fine.
Unfortunately, anotherName passes the test, but I don't want it
to. Is there anyway I can distinguish the anotherName alias from
funcPtr without tagging it with a UDA? I can't find any sort of
isAlias trait anywhere.
