add comment syntax somewhat similiar to <!--

[edditler]

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So this aims at resolving https://github.com/jfbastien/cpp-html/issues/1. As far as I understood special characters apart from underscores are not allowed in macro definitions.

Is there another way to make this more similar to the <!-- comment --> syntax?

[jfbastien]

What you want is Unicode characters that look right and are valid in C++ identifiers. Something like ﹤❗–– and ––﹥.