ref: 3c6c5a02710e4d7a3da6121e9bfb8d2bc0d786dd 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; }