// RUN: %clang_cl_asan -Od %s -Fe%t
// RUN: not %run %t 2>&1 | FileCheck %s

#include <malloc.h>

int main() {
  int *buffer = (int*)calloc(42, sizeof(int));
  buffer[-1] = 42;
// CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
// CHECK: WRITE of size 4 at [[ADDR]] thread T0
// CHECK-NEXT: {{#0 .* main .*calloc_left_oob.cpp}}:[[@LINE-3]]
// CHECK: [[ADDR]] is located 4 bytes to the left of 168-byte region
// CHECK: allocated by thread T0 here:
// CHECK-NEXT: {{#0 .* calloc }}
// CHECK-NEXT: {{#1 .* main .*calloc_left_oob.cpp}}:[[@LINE-8]]
  free(buffer);
}