https://issues.dlang.org/show_bug.cgi?id=8262
--- Comment #5 from [email protected] --- And the reason is because aliasthisOf() does not expect a TypeTuple; it expects a variable declaration, a function, an enum, or a template. Normally, TypeTuples cannot appear in an alias this due to the current grammar, but there is a loophole where they can be masked by another layer of alias, as in the code given here, so it leads into this unhandled case. --
