--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Modules/const-var-init-update.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,30 @@
+// RUN: %clang_cc1 -std=c++1z -fmodules %s -verify
+// expected-no-diagnostics
+
+#pragma clang module build std
+module std { module limits {} module other {} }
+#pragma clang module contents
+#pragma clang module begin std.limits
+template<typename T> struct numeric_limits {
+  static constexpr T __max = 5;
+  static constexpr T max() { return __max; }
+};
+#pragma clang module end
+#pragma clang module begin std.other
+inline void f() { numeric_limits<int> nl; }
+#pragma clang module end
+#pragma clang module endbuild
+
+#pragma clang module build module_b
+module module_b {}
+#pragma clang module contents
+#pragma clang module begin module_b
+#pragma clang module import std.limits
+constexpr int a = numeric_limits<int>::max();
+#pragma clang module end
+#pragma clang module endbuild
+
+#pragma clang module import std.limits
+#pragma clang module import module_b
+constexpr int b = a;
+static_assert(b == 5);