template, keep looking for default arguments if we see a template parameter
pack. There may be default arguments preceding a pack with no default argument.
Patch by Jannis Harder!
llvm-svn: 259836
for (unsigned I = 0, N = FromTP->size(); I != N; ++I) {
NamedDecl *FromParam = FromTP->getParam(N - I - 1);
+ if (FromParam->isParameterPack())
+ continue;
NamedDecl *ToParam = ToTP->getParam(N - I - 1);
if (auto *FTTP = dyn_cast<TemplateTypeParmDecl>(FromParam)) {
--- /dev/null
+// Test this without pch.
+// RUN: %clang_cc1 -std=c++11 -include %s -fsyntax-only -verify %s
+
+// Test with pch.
+// RUN: %clang_cc1 -std=c++11 -x c++-header -emit-pch -o %t %s
+// RUN: %clang_cc1 -std=c++11 -include-pch %t -fsyntax-only -verify %s
+
+// expected-no-diagnostics
+
+// PR25271: Ensure that default template arguments prior to a parameter pack
+// successfully round-trip.
+#ifndef HEADER
+#define HEADER
+template<unsigned T=123, unsigned... U>
+class dummy;
+
+template<unsigned T, unsigned... U>
+class dummy {
+ int field[T];
+};
+#else
+void f() {
+ dummy<> x;
+ (void)x;
+}
+#endif