[Sema] Don't diagnose an array type mismatch when the new or previous
declaration has a dependent type.

This fixes a bug where clang errors out on a valid code.

rdar://problem/28051467

Differential Revision: https://reviews.llvm.org/D24110

llvm-svn: 280330
diff --git a/clang/test/SemaTemplate/array-redeclaration.cpp b/clang/test/SemaTemplate/array-redeclaration.cpp
new file mode 100644
index 0000000..4edee70
--- /dev/null
+++ b/clang/test/SemaTemplate/array-redeclaration.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+extern int array[1];
+
+template <typename>
+class C {
+  enum { D };
+public:
+  template <typename A> void foo1() {
+    extern int array[((int)C<A>::k > (int)D) ? 1 : -1];
+  }
+};
+
+template<>
+class C<int> {
+public:
+  const static int k = 2;
+};
+
+void foo2() {
+  C<char> c;
+  c.foo1<int>();
+}
+
+template<int n>
+void foo3() {
+  extern int array[n ? 1 : -1];
+}
+
+void foo4() {
+  foo3<5>();
+}