[LLVMbugs] [Bug 19372] assertion "Replacement.isCanonical() && "replacement types must always be canonical""

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19372

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #8 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Fixed in r221832.

And now I understand the problem, here's a simpler reducer:

template<typename...> struct S;
template<typename ...A> using X = S<A...>;
template<typename ...A> using Y = X<A..., A...>;

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