class RuboCop::Cop::Lint::AmbiguousAssignment


x != y # or x = !y
x *= y # or x = *y
x += y # or x = +y
x -= y # or x = -y
# good
x =! y
x =* y
x =+ y
x =- y
# bad
@example
Checks for mistyped shorthand assignments.

def on_asgn(node) 

def on_asgn(node)
  return unless (rhs = rhs(node))
  range = range_between(node.loc.operator.end_pos - 1, rhs.source_range.begin_pos + 1)
  source = range.source
  return unless MISTAKES.key?(source)
  add_offense(range, message: format(MSG, op: MISTAKES[source]))
end

def rhs(node) 

def rhs(node)
  if node.casgn_type?
    node.children[2]
  else
    node.children[1]
  end
end