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// Origin PR c++/51194 // { dg-do compile { target c++11 } } template<class U, class V> //#1 struct foo {}; template<class U, class V=char> struct P {}; template<template<class... U> class... TT> struct bar { template<class... Args> using mem = P<TT<Args...>...>;//#2 }; bar<foo>::mem<int, char> b;//#3