Is this Objective-C code for the header file?

Property definitions

nitc :: objc $ AExternCodeBlock :: is_objc_header
	# Is this Objective-C code for the header file?
	fun is_objc_header : Bool do return language_name != null and
		(language_name_lowered == "objc header")
src/ffi/objc.nit:135,2--137,42