macro name with `:'

Marc Chantreux <[email protected]>
Newsgroups gmane.comp.gnu.m4.general
Message-ID <[email protected]>
hello guys,

define(`H1',"ok ... this is title ") 

works fine and i would like to figure out how to make this work: 

define(`H1:',"ok ... this is title ") 

regards
marc
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