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diff --git a/clang/test/Sema/tentative-decls.c b/clang/test/Sema/tentative-decls.c
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+++ b/clang/test/Sema/tentative-decls.c
@@ -0,0 +1,65 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify
+
+// PR3310
+struct a x1; // expected-note 2{{forward declaration of 'struct a'}}
+static struct a x2; // expected-warning{{tentative definition of variable with internal linkage has incomplete non-array type 'struct a'}}
+struct a x3[10]; // expected-error{{array has incomplete element type 'struct a'}}
+struct a {int x;};
+static struct a x2_okay;
+struct a x3_okay[10];
+struct b x4; // expected-error{{tentative definition has type 'struct b' that is never completed}} \
+            // expected-note{{forward declaration of 'struct b'}}
+
+const int a [1] = {1};
+extern const int a[];
+
+extern const int b[];
+const int b [1] = {1};
+
+extern const int c[] = {1}; // expected-warning{{'extern' variable has an initializer}}
+const int c[];
+
+int i1 = 1; // expected-note {{previous definition is here}}
+int i1 = 2; // expected-error {{redefinition of 'i1'}}
+int i1;
+int i1;
+extern int i5; // expected-note {{previous definition is here}}
+static int i5; // expected-error{{static declaration of 'i5' follows non-static declaration}}
+
+static int i2 = 5; // expected-note 1 {{previous definition is here}}
+int i2 = 3; // expected-error{{non-static declaration of 'i2' follows static declaration}}
+
+static int i3 = 5;
+extern int i3;
+
+__private_extern__ int pExtern;
+int pExtern = 0;
+
+int i4;
+int i4;
+extern int i4;
+
+int (*pToArray)[];
+int (*pToArray)[8];
+
+int redef[10];
+int redef[];  // expected-note {{previous definition is here}}
+int redef[11]; // expected-error{{redefinition of 'redef'}}
+
+void func() {
+  extern int i6; // expected-note {{previous definition is here}}
+  static int i6; // expected-error{{static declaration of 'i6' follows non-static declaration}}
+}
+
+void func2(void)
+{
+  extern double *p;
+  extern double *p;
+}
+
+// <rdar://problem/6808352>
+static int a0[];
+static int b0;
+
+static int a0[] = { 4 };
+static int b0 = 5;