P0217R3: serialization/deserialization support for c++17 decomposition declarations.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278460 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 0 deletions

diff --git a/test/PCH/cxx1z-decomposition.cpp b/test/PCH/cxx1z-decomposition.cpp
new file mode 100644
index 0000000000..e033577162
--- /dev/null
+++ b/test/PCH/cxx1z-decomposition.cpp
@@ -0,0 +1,32 @@
+// No PCH:
+// RUN: %clang_cc1 -pedantic -std=c++1z -include %s -verify %s
+//
+// With PCH:
+// RUN: %clang_cc1 -pedantic -std=c++1z -emit-pch %s -o %t
+// RUN: %clang_cc1 -pedantic -std=c++1z -include-pch %t -verify %s
+
+#ifndef HEADER
+#define HEADER
+
+template<typename T> auto decomp(const T &t) {
+  auto &[a, b] = t;
+  return a + b;
+}
+
+struct Q { int a, b; };
+constexpr int foo(Q &&q) {
+  auto &[a, b] = q;
+  return a * 10 + b;
+}
+
+#else
+
+int arr[2];
+int k = decomp(arr);
+
+static_assert(foo({1, 2}) == 12);
+
+// expected-error@12 {{cannot decompose non-class, non-array type 'const int'}}
+int z = decomp(10); // expected-note {{instantiation of}}
+
+#endif