Change a macro in a namespace

Hi,

I read in http://freemarker.org/docs/dgui_misc_namespace.html#autoid_26
it's possible to change a variable in a namespace with "assign".

is it possible to change a macro ? how ?

For instance, very stupid exemple in a lib.ftl :

<#macro oyeee>
<b>YES</b>
</#macro>

in main;ftl :
<#import "lib.ftl" as lib>

<!-- IS IT POSSIBLE ? -->
<# assign oyeee = foooo in lib>

<#macro foooo>
<b>VERY YES</b>
</#macro>


Thanks.

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