#define
#undef
#if
#ifdef
#ifndef
#else
#elif
#endif
#error
#pragma
#extension
#version
#line

----------------------------------------------------

[
	["preprocessor", "#define"],
	["preprocessor", "#undef"],
	["preprocessor", "#if"],
	["preprocessor", "#ifdef"],
	["preprocessor", "#ifndef"],
	["preprocessor", "#else"],
	["preprocessor", "#elif"],
	["preprocessor", "#endif"],
	["preprocessor", "#error"],
	["preprocessor", "#pragma"],
	["preprocessor", "#extension"],
	["preprocessor", "#version"],
	["preprocessor", "#line"]
]

----------------------------------------------------

Checks for preprocessor instructions.