1#ifndef A1_H 2#define A1_H 3namespace llvm { 4class MachineBasicBlock; 5template <class NodeT> class DomTreeNodeBase; 6typedef DomTreeNodeBase<MachineBasicBlock> MachineDomTreeNode; 7} 8 9typedef struct {} foo_t; 10typedef foo_t foo2_t; 11#endif 12