m4 bug?

[Pavel Aksonov]

Hello All,

Could you help me?
================================================
define(_if,`<if cond="$1">$2<else/>$3</if>')dnl
define(_goto,`<goto next="#$1"/>')dnl
define(_if_goto,`_if($1,`_goto($1)',`_goto($2)')')dnl
_if_goto(a, b, c)
================================================
Why this cod gives:
<if cond="a"><goto next="#a"/><else/>_goto(b)</if>

instead of

<if cond="a"><goto next="#a"/><else/><goto next="#b"/></if>

?

Thanks.

-- 
Best regards,
 Pavel