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int c = -1; foo (p) int *p; { int x; int a; a = p[0]; x = a + 5; a = c; p[0] = x - 15; return a; } int main() { int b = 1; int a = foo(&b); if (a != -1 || b != (1 + 5 - 15)) abort (); exit (0); }