class Prism::ConstantPathAndWriteNode

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?(ConstantPathAndWriteNode) &&
    (target === other.target) &&
    (operator_loc.nil? == other.operator_loc.nil?) &&
    (value === other.value)
end