#if foo
#else
#endif

#light
#line
#nowarn

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

[
	["preprocessor", ["#", ["directive", "if"], " foo"]],
	["preprocessor", ["#", ["directive", "else"]]],
	["preprocessor", ["#", ["directive", "endif"]]],
	["preprocessor", ["#", ["directive", "light"]]],
	["preprocessor", ["#", ["directive", "line"]]],
	["preprocessor", ["#", ["directive", "nowarn"]]]
]

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

Checks for preprocessor directives.