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      1 // RUN: %clang_cl_asan -O0 %s -Fe%t
      2 // RUN: not %run %t 2>&1 | FileCheck %s
      3 
      4 #include <malloc.h>
      5 
      6 int main() {
      7   int *x = (int*)malloc(42 * sizeof(int));
      8   free(x);
      9   free(x);
     10 // CHECK: AddressSanitizer: attempting double-free on [[ADDR:0x[0-9a-f]+]]
     11 // CHECK-NEXT: {{#0 .* free }}
     12 // CHECK-NEXT: {{#1 .* main .*double_free.cc}}:[[@LINE-3]]
     13 // CHECK: [[ADDR]] is located 0 bytes inside of 168-byte region
     14 // CHECK-LABEL: freed by thread T0 here:
     15 // CHECK-NEXT: {{#0 .* free }}
     16 // CHECK-NEXT: {{#1 .* main .*double_free.cc}}:[[@LINE-8]]
     17 // CHECK-LABEL: previously allocated by thread T0 here:
     18 // CHECK-NEXT: {{#0 .* malloc }}
     19 // CHECK-NEXT: {{#1 .* main .*double_free.cc}}:[[@LINE-12]]
     20   return 0;
     21 }
     22