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diff --git a/clang/test/CXX/expr/expr.const/p5-0x.cpp b/clang/test/CXX/expr/expr.const/p5-0x.cpp
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+++ b/clang/test/CXX/expr/expr.const/p5-0x.cpp
@@ -0,0 +1,85 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
+
+// If an expression of literal class type is used in a context where an integral
+// constant expression is required, then that class type shall have a single
+// non-explicit conversion function to an integral or unscoped enumeration type
+namespace std_example {
+
+struct A {
+  constexpr A(int i) : val(i) { }
+  constexpr operator int() { return val; }
+  constexpr operator long() { return 43; }
+private:
+  int val;
+};
+template<int> struct X { };
+constexpr A a = 42;
+X<a> x;     // ok, unique conversion to int
+int ary[a]; // expected-error {{size of array has non-integer type 'const std_example::A'}}
+
+}
+
+struct OK {
+  constexpr OK() {}
+  constexpr operator int() { return 8; }
+} constexpr ok;
+extern struct Incomplete incomplete; // expected-note 4{{forward decl}}
+struct Explicit {
+  constexpr Explicit() {}
+  constexpr explicit operator int() { return 4; } // expected-note 4{{here}}
+} constexpr expl;
+struct Ambiguous {
+  constexpr Ambiguous() {}
+  constexpr operator int() { return 2; } // expected-note 4{{here}}
+  constexpr operator long() { return 1; } // expected-note 4{{here}}
+} constexpr ambig;
+
+constexpr int test_ok = ok; // ok
+constexpr int test_explicit(expl); // ok
+constexpr int test_ambiguous = ambig; // ok
+
+static_assert(test_ok == 8, "");
+static_assert(test_explicit == 4, "");
+static_assert(test_ambiguous == 2, "");
+
+// [expr.new]p6: Every constant-expression in a noptr-new-declarator shall be
+// an integral constant expression
+auto new1 = new int[1][ok];
+auto new2 = new int[1][incomplete]; // expected-error {{incomplete}}
+auto new3 = new int[1][expl]; // expected-error {{explicit conversion}}
+auto new4 = new int[1][ambig]; // expected-error {{ambiguous conversion}}
+
+// [dcl.enum]p5: If the underlying type is not fixed [...] the initializing
+// value [...] shall be an integral constant expression.
+enum NotFixed {
+  enum1 = ok,
+  enum2 = incomplete, // expected-error {{incomplete}}
+  enum3 = expl, // expected-error {{explicit conversion}}
+  enum4 = ambig // expected-error {{ambiguous conversion}}
+};
+
+// [dcl.align]p2: When the alignment-specifier is of the form
+// alignas(assignment-expression), the assignment-expression shall be an
+// integral constant expression
+int alignas(ok) alignas1;
+int alignas(incomplete) alignas2; // expected-error {{incomplete}}
+int alignas(expl) alignas3; // expected-error {{explicit conversion}}
+int alignas(ambig) alignas4; // expected-error {{ambiguous conversion}}
+
+// [dcl.array]p1: If the constant-expression is present, it shall be an integral
+// constant expression
+// FIXME: The VLA recovery results in us giving diagnostics which aren't great
+// here.
+int array1[ok];
+int array2[incomplete]; // expected-error {{non-integer type}}
+int array3[expl]; // expected-error {{non-integer type}}
+int array4[ambig]; // expected-error {{non-integer type}}
+
+// [class.bit]p1: The constasnt-expression shall be an integral constant
+// expression
+struct Bitfields {
+  int bitfield1 : ok;
+  int bitfield2 : incomplete; // expected-error {{incomplete}}
+  int bitfield3 : expl; // expected-error {{explicit conversion}}
+  int bitfield4 : ambig; // expected-error {{ambiguous conversion}}
+};