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/* e_25_6.t: Macro arguments are pre-expanded separately. */
#define sub( x, y) (x - y)
/* 25.6: */
#define head sub(
#define body(x,y) x,y
#define tail )
#define head_body_tail( a, b, c) a b c
/* "head" is once replaced to "sub(", then rescanning of "sub(" causes an
uncompleted macro call. Expansion of an argument should complete
within the argument. */
head_body_tail( head, body(a,b), tail);