ref: f53e048d3a57eeee135e2d8aa3cd72b7f3dc2711 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; }