ref: 3e5e7c470c58ff0b76e6cabc83691897ca4d4e93 dir: /tests/cc/execute/0155-struct-compl.c/
extern struct X x; int foo(); int main() { extern struct X x; return &x != 0; } struct X {int v;}; int foo() { x.v = 0; return x.v; }