File: main.c

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#include <assert.h>

// gcc allows the following 'tentative definitions'.
// Note that none of these has a size at the time of the
// variable definition.

union U my_u;

union U
{
  int some;
};

struct S my_s;

struct S
{
  int some;
};

enum E my_e;

enum E { ASD };

int main()
{
  assert(my_u.some==0);
  assert(my_s.some==0);
  assert(my_e==0);
}