Property definitions

nitc $ AExternCodeBlock :: defaultinit
# An full extern block
class AExternCodeBlock
	super Prod

	# The language declration
	var n_in_language: nullable AInLanguage = null is writable

	# The block of extern code
	var n_extern_code_segment: TExternCodeSegment is writable, noinit
end
src/parser/parser_nodes.nit:3014,1--3023,3