import std.meta: AliasSeq;
alias a = AliasSeq!int; static if (<is a an AliasSeq>) { }__traits(isSame, a, AliasSeq!a) could work but doesn't, because it flattens singletons, which means __traits(isSame, int, AliasSeq!int) is true. (A bug/bad design, IMO. If the intended behavior is not to flatten tuples passed to __traits, there is no reason to make a special case for singletons).