!
! .MACRO foo a b c=a
! \a \b \c \d
! .ENDM
! foo 1 2
! 1 2 a \d
1 2 a \d
! foo 1 2 3 4
! foo 1
! 1 a \d
1 a \d
! foo
! a \d
a \d
! .END