ref: c1b4b8354a76cc8c9aa13757e8b3db8d1b5a7c39 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; }