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`
Preprocessor directive types:
#FOO# Call a macro or function.
#=BAR# A string that can be stored by a macro.
#def# #ID# [#=VALUE#] Set a macro.
#fed# #ID# Unset a macro.
#dex# #ID?# ... #xed# If macro ID is defined, expand to ... (Defined EXpand).
#uex# #ID?# ... #xeu# If macro ID is undefined, expand to ... (Undefined EXpand).
#inc# #FILE# Include a file; first searches cwd, then some kind of $HALKPATH.
#ID# Call a macro.
`
` Example usage: `
` Simple header guard. `
#uex# #TEST#
#def# #TEST#
#inc# #io#
#inc# #packet.hlk#
#def# #VERSION# #= 3.14.1 #
#def# #ERR# #= {io!print."Error D:"; die;} #
:packet_t:p = packet!get;
?.(~=.p!version,#VERSION#),#ERR#; ` Throw error if versions do not match. `
#xeu#
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