macro expansion is not correct

chibicc -E macro.c

BAR() 1

gcc -E macro.c

BAR_I ()() 1 1 1

// macro.c
#define EMPTY()
#define DEFER(id) id EMPTY()
#define EXPAND(...) __VA_ARGS__
#define BAR_I() BAR
#define BAR()  DEFER(BAR_I)()() 1
EXPAND(EXPAND(BAR()))