From fd62945d36bbf71f42f6c08fea144200ad90a0fb Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Tue, 31 Oct 2017 20:29:22 +0000
Subject: Fix usage of right shift operator in fold expressions

The right shift operator was not seen as a valid operator in a fold expression, which is PR32563.

Patch by Nicolas Lesser ("Blitz Rakete")!

llvm-svn: 317032
---
 clang/test/Parser/cxx1z-fold-expressions.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'clang/test')

diff --git a/clang/test/Parser/cxx1z-fold-expressions.cpp b/clang/test/Parser/cxx1z-fold-expressions.cpp
index b1f7318e410..342f11555fa 100644
--- a/clang/test/Parser/cxx1z-fold-expressions.cpp
+++ b/clang/test/Parser/cxx1z-fold-expressions.cpp
@@ -43,3 +43,20 @@ template<typename ...T> void as_operand_of_cast(int a, T ...t) {
     (int)(undeclared_junk + ...) + // expected-error {{undeclared}}
     (int)(a + ...); // expected-error {{does not contain any unexpanded}}
 }
+
+// fold-operator can be '>' or '>>'.
+template <int... N> constexpr bool greaterThan() { return (N > ...); }
+template <int... N> constexpr int rightShift() { return (N >> ...); }
+
+static_assert(greaterThan<2, 1>());
+static_assert(rightShift<10, 1>() == 5);
+
+template <auto V> constexpr auto Identity = V;
+
+// Support fold operators within templates.
+template <int... N> constexpr int nestedFoldOperator() {
+  return Identity<(Identity<0> >> ... >> N)> +
+    Identity<(N >> ... >> Identity<0>)>;
+}
+
+static_assert(nestedFoldOperator<3, 1>() == 1);
-- 
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