The `if` keyword

Property definitions

	# The `if` keyword
	var n_kwif: TKwif is writable, noinit

src/parser/parser_nodes.nit:1984,2--1985,38

	redef fun n_kwif=(node)
	do
		_n_kwif = node
		node.parent = self
	end

src/parser/parser_prod.nit:3164,2--3168,4