From 86e9c5f13d2dd07b8be5e69854e20ed218a3ee14 Mon Sep 17 00:00:00 2001
From: Casey Carter <Casey@Carter.net>
Date: Tue, 6 Dec 2016 02:28:19 +0000
Subject: [PATCH] std::get<0>([std::variant constant expression]) *is*
 noexcept.

Differential review: http://reviews.llvm.org/D27436

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@288760 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../variant/variant.get/get_index.pass.cpp    | 21 ++++++++++++++++++-
 .../variant/variant.get/get_type.pass.cpp     | 21 ++++++++++++++++++-
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/test/std/utilities/variant/variant.get/get_index.pass.cpp b/test/std/utilities/variant/variant.get/get_index.pass.cpp
index 669da5305..72d17b0ed 100644
--- a/test/std/utilities/variant/variant.get/get_index.pass.cpp
+++ b/test/std/utilities/variant/variant.get/get_index.pass.cpp
@@ -36,16 +36,35 @@ void test_const_lvalue_get() {
   {
     using V = std::variant<int, const long>;
     constexpr V v(42);
-    ASSERT_NOT_NOEXCEPT(std::get<0>(v));
+#ifndef __clang__ // Avoid https://llvm.org/bugs/show_bug.cgi?id=15481
+    ASSERT_NOEXCEPT(std::get<0>(v));
+#endif
     ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
     static_assert(std::get<0>(v) == 42, "");
   }
+  {
+    using V = std::variant<int, const long>;
+    const V v(42);
+    ASSERT_NOT_NOEXCEPT(std::get<0>(v));
+    ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
+    assert(std::get<0>(v) == 42);
+  }
   {
     using V = std::variant<int, const long>;
     constexpr V v(42l);
+#ifndef __clang__ // Avoid https://llvm.org/bugs/show_bug.cgi?id=15481
+    ASSERT_NOEXCEPT(std::get<1>(v));
+#endif
     ASSERT_SAME_TYPE(decltype(std::get<1>(v)), const long &);
     static_assert(std::get<1>(v) == 42, "");
   }
+  {
+    using V = std::variant<int, const long>;
+    const V v(42l);
+    ASSERT_NOT_NOEXCEPT(std::get<1>(v));
+    ASSERT_SAME_TYPE(decltype(std::get<1>(v)), const long &);
+    assert(std::get<1>(v) == 42);
+  }
 // FIXME: Remove these once reference support is reinstated
 #if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
   {
diff --git a/test/std/utilities/variant/variant.get/get_type.pass.cpp b/test/std/utilities/variant/variant.get/get_type.pass.cpp
index 497f00401..fc355378a 100644
--- a/test/std/utilities/variant/variant.get/get_type.pass.cpp
+++ b/test/std/utilities/variant/variant.get/get_type.pass.cpp
@@ -30,16 +30,35 @@ void test_const_lvalue_get() {
   {
     using V = std::variant<int, const long>;
     constexpr V v(42);
-    ASSERT_NOT_NOEXCEPT(std::get<int>(v));
+#ifndef __clang__ // Avoid https://llvm.org/bugs/show_bug.cgi?id=15481
+    ASSERT_NOEXCEPT(std::get<int>(v));
+#endif
     ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
     static_assert(std::get<int>(v) == 42, "");
   }
+  {
+    using V = std::variant<int, const long>;
+    const V v(42);
+    ASSERT_NOT_NOEXCEPT(std::get<int>(v));
+    ASSERT_SAME_TYPE(decltype(std::get<0>(v)), const int &);
+    assert(std::get<int>(v) == 42);
+  }
   {
     using V = std::variant<int, const long>;
     constexpr V v(42l);
+#ifndef __clang__ // Avoid https://llvm.org/bugs/show_bug.cgi?id=15481
+    ASSERT_NOEXCEPT(std::get<const long>(v));
+#endif
     ASSERT_SAME_TYPE(decltype(std::get<const long>(v)), const long &);
     static_assert(std::get<const long>(v) == 42, "");
   }
+  {
+    using V = std::variant<int, const long>;
+    const V v(42l);
+    ASSERT_NOT_NOEXCEPT(std::get<const long>(v));
+    ASSERT_SAME_TYPE(decltype(std::get<const long>(v)), const long &);
+    assert(std::get<const long>(v) == 42);
+  }
 // FIXME: Remove these once reference support is reinstated
 #if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
   {