ref: 94f23734015424515144b54f0a9f9d6c9d2f34c2 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; }