Shadow arguments not parsed as local variables

[akimd]

[1].each do |x; a, b, c|
  puts x + a + b + c
end

gives

s(:iter,
  s(:call, s(:array, s(:lit, 1)), :each),
  s(:args, :x, s(:shadow, :a, :b, :c)),
  s(:call, nil, :puts, s(:call, s(:call, s(:call, s(:lvar, :x), :+, s(:call, nil, :a)), :+, s(:call, nil, :b)), :+, s(:call, nil, :c))))

Note that a, b and c are considered to be attributes, not variables, contrary to x.

[zenspider]

Fixed:

s(:iter,
 s(:call, s(:array, s(:lit, 1)), :each),
 s(:args, :x, s(:shadow, :a, :b, :c)),
 s(:call,
  nil,
  :puts,
  s(:call,
   s(:call, s(:call, s(:lvar, :x), :+, s(:lvar, :a)), :+, s(:lvar, :b)),
   :+,
   s(:lvar, :c))))