ref: 9cdf8d4b4c9ecf24e8e065fdbf9a6aea48d5f4af dir: /tests/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; }