class Prism::MatchWriteNode

def ===(other)

comparing the value of locations. Locations are checked only for presence.
Implements case-equality for the node. This is effectively == but without 
def ===(other)
  other.is_a?(MatchWriteNode) &&
    (call === other.call) &&
    (targets.length == other.targets.length) &&
    targets.zip(other.targets).all? { |left, right| left === right }
end