int i1 = 10; /* definition, external linkage */
static int i2 = 20; /* definition, internal linkage */
extern int i3 = 30; /* definition, external linkage */
int i4; /* tentative definition, external linkage */
static int i5; /* tentative definition, internal linkage */
int i1; /* valid tentative definition */
int i2; /* not valid, linkage disagreement with previous */
int i3; /* valid tentative definition */
int i4; /* valid tentative definition */
int i5; /* not valid, linkage disagreement with previous */
int main(void) {
/* ... */
}
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