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

#include <malloc.h>

int main() {
  char *buffer = (char*)malloc(42);
  buffer[-1] = 42;
  // CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
  // CHECK: WRITE of size 1 at [[ADDR]] thread T0
  // CHECK-NEXT: {{#0 .* main .*malloc_left_oob.cpp}}:[[@LINE-3]]
  // CHECK: [[ADDR]] is located 1 bytes before 42-byte region
  // CHECK: allocated by thread T0 here:
  // CHECK-NEXT: {{#0 .* malloc }}
  // CHECK: {{ #[1-2] .* main .*malloc_left_oob.cpp}}:[[@LINE-8]]
  free(buffer);
}