--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/function-redecl.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,133 @@
+// RUN: %clang_cc1 -triple %itanium_abi_triple -fsyntax-only -verify %s
+
+// PR3588
+void g0(int, int);
+void g0(); // expected-note{{previous declaration is here}} expected-note{{'g0' declared here}}
+
+void f0() {
+  g0(1, 2, 3); // expected-error{{too many arguments to function call}}
+}
+
+void g0(int); // expected-error{{conflicting types for 'g0'}}
+
+int g1(int, int);
+
+typedef int INT;
+
+INT g1(x, y)
+     int x;
+     int y;
+{
+  return x + y;
+}
+
+int g2(int, int); // expected-note{{previous declaration is here}}
+
+INT g2(x) // expected-error{{conflicting types for 'g2'}}
+     int x;
+{
+  return x;
+}
+
+void test() {
+  int f1;
+  {
+    void f1(double);
+    {
+      void f1(double); // expected-note{{previous declaration is here}}
+      {
+        int f1(int); // expected-error{{conflicting types for 'f1'}}
+      }
+    }
+  }
+}
+
+extern void g3(int); // expected-note{{previous declaration is here}}
+static void g3(int x) { } // expected-error{{static declaration of 'g3' follows non-static declaration}}
+
+void test2() {
+  extern int f2; // expected-note 2 {{previous definition is here}}
+  {
+    void f2(int); // expected-error{{redefinition of 'f2' as different kind of symbol}}
+  }
+
+  {
+    int f2;
+    {
+      void f2(int); // expected-error{{redefinition of 'f2' as different kind of symbol}}
+    }
+  }
+}
+
+// <rdar://problem/6127293>
+int outer1(int); // expected-note{{previous declaration is here}}
+struct outer3 { };
+int outer4(int); // expected-note{{previous declaration is here}}
+int outer5; // expected-note{{previous definition is here}}
+int *outer7(int);
+
+void outer_test() {
+  int outer1(float); // expected-error{{conflicting types for 'outer1'}}
+  int outer2(int); // expected-note{{previous declaration is here}}
+  int outer3(int); // expected-note{{previous declaration is here}}
+  int outer4(int);
+  int outer5(int); // expected-error{{redefinition of 'outer5' as different kind of symbol}}
+  int* outer6(int); // expected-note{{previous declaration is here}}
+  int *outer7(int);
+  int outer8(int);
+
+  int *ip7 = outer7(6);
+}
+
+int outer2(float); // expected-error{{conflicting types for 'outer2'}}
+int outer3(float); // expected-error{{conflicting types for 'outer3'}}
+int outer4(float); // expected-error{{conflicting types for 'outer4'}}
+
+void outer_test2(int x) {
+  int* ip = outer6(x); // expected-warning{{use of out-of-scope declaration of 'outer6'}}
+  int *ip2 = outer7(x);
+}
+
+void outer_test3() {
+  int *(*fp)(int) = outer8; // expected-error{{use of undeclared identifier 'outer8'}}
+}
+
+enum e { e1, e2 };
+
+// GNU extension: prototypes and K&R function definitions
+int isroot(short x, // expected-note{{previous declaration is here}}
+           enum e); 
+
+int isroot(x, y)
+     short x; // expected-warning{{promoted type 'int' of K&R function parameter is not compatible with the parameter type 'short' declared in a previous prototype}}
+     unsigned int y;
+{
+  return x == 1;
+}
+
+// PR3817
+void *h0(unsigned a0,     ...);
+extern __typeof (h0) h1 __attribute__((__sentinel__));
+extern __typeof (h1) h1 __attribute__((__sentinel__));
+
+// PR3840
+void i0 (unsigned short a0);
+extern __typeof (i0) i1;
+extern __typeof (i1) i1;
+
+typedef int a();
+typedef int a2(int*);
+a x;
+a2 x2; // expected-note{{passing argument to parameter here}}
+void test_x() {
+  x(5);
+  x2(5); // expected-warning{{incompatible integer to pointer conversion passing 'int' to parameter of type 'int *'}}
+}
+
+enum e0 {one}; 
+void f3(); 
+void f3(enum e0 x) {}
+
+enum incomplete_enum;
+void f4(); // expected-note {{previous declaration is here}}
+void f4(enum incomplete_enum); // expected-error {{conflicting types for 'f4'}}