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1 // RUN: %clang_cc1 -std=c++11 -verify %s
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2
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3 template<typename ...T> struct X {
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4 void f(int);
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5 void f(...);
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6 static int n;
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7 };
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8
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9 template<typename T, typename U> using A = T;
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10
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11 // These definitions are OK, X<A<T, decltype(...)>...> is equivalent to X<T...>
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12 // so this defines the member of the primary template.
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13 template<typename ...T>
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14 void X<A<T, decltype(f(T()))>...>::f(int) {} // expected-error {{undeclared}}
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15
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16 template<typename ...T>
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17 int X<A<T, decltype(f(T()))>...>::n = 0; // expected-error {{undeclared}}
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18
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19 struct Y {}; void f(Y);
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20
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21 void g() {
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22 // OK, substitution succeeds.
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23 X<Y>().f(0);
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24 X<Y>::n = 1;
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25
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26 // Error, substitution fails; this should not be treated as a SFINAE-able
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27 // condition, so we don't select X<void>::f(...).
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28 X<void>().f(0); // expected-note {{instantiation of}}
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29 X<void>::n = 1; // expected-note {{instantiation of}}
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30 }
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