--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/implicit-builtin-redecl.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// PR3592
+static void* malloc(int);
+static void* malloc(int size) {
+  return ((void*)0); /*do not use heap in this file*/
+}
+
+void *calloc(int, int, int); // expected-warning{{incompatible redeclaration of library function 'calloc'}} \
+// expected-note{{'calloc' is a builtin with type 'void *}}
+
+void f1(void) { 
+  calloc(0, 0, 0);
+}
+
+void f2() {
+  int index = 1;
+}
+
+static int index;
+
+int f3() {
+  return index << 2;
+}
+
+typedef int rindex;