PR14841: If partial substitution of explicitly-specified template arguments

results in a template having too many arguments, but all the trailing arguments
are packs, that's OK if we have a partial pack substitution: the trailing pack
expansions may end up empty.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@210350 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/test/SemaTemplate/pack-deduction.cpp b/test/SemaTemplate/pack-deduction.cpp
index 2d0a03f0fc..abb76de693 100644
--- a/test/SemaTemplate/pack-deduction.cpp
+++ b/test/SemaTemplate/pack-deduction.cpp
@@ -18,3 +18,15 @@ namespace Nested {
   int b1 = f2(P<X<int, double>, int>(), P<X<int, double>, double>());
   int b2 = f2(P<X<int, double>, int>(), P<X<int, double>, double>(), P<X<int, double>, char>()); // expected-error {{no matching}}
 }
+
+namespace PR14841 {
+  template<typename T, typename U> struct A {};
+  template<typename ...Ts> void f(A<Ts...>); // expected-note {{substitution failure [with Ts = <char, short, int>]: too many template arg}}
+
+  void g(A<char, short> a) {
+    f(a);
+    f<char>(a);
+    f<char, short>(a);
+    f<char, short, int>(a); // expected-error {{no matching function}}
+  }
+}