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#include <assert.h>
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
void *p1 = malloc(1023);
fprintf(stderr, "size: %zu\n", malloc_usable_size(p1));
assert(malloc_usable_size(p1) >= 1023);
free(p1);
return 0;
}
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