# A Variable definition.
#
# Associates a variable to the location of its definition.
class VarDef
	super Comparable

	redef type OTHER: VarDef

	# Variable this definition is about.
	var variable: Variable

	# Location of this definition in the source code.
	var location: Location

	redef fun ==(o) do
		return o isa OTHER and variable == o.variable and location == o.location
	end

	redef fun <=>(o) do
		if variable.name == o.variable.name then
			return location.line_start <=> o.location.line_start
		else
			return variable.name <=> o.variable.name
		end
	end

	redef fun hash do return variable.hash + location.hash
	redef fun to_s do return "\{{variable}: {location.line_start}\}"
end