Yes, Rust macros have certain syntax requirements that allow the code to parse without knowing what a macro does (and to find out where a macro ends). Don't quo

Yes, Rust macros have certain syntax requirements that allow the code to parse without knowing what a macro does (and to find out where a macro ends). Don't quote me but there are some token requirements as well as balanced parenthesis. If you allow another language to be inserted raw you risk that it requires syntax that would break these requirements. Buy using a raw string literal you have a well defined quoting syntax mediating the two languages.