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> While libsass is primarily implemented in C++, it provides a simple C interface that is defined in [sass_inteface.h].

To be fair, that argument can be applied to most scripting languages:

A C header for a C++ library that integrates V8 and runs JS code can, according to your logic, count as a C implementation.

No, because it can't be used in straight up C, while C++ libraries that expose their functionality with valid C can.