Unclear red tildes indicated syntax errors by using block local variables in arrow style lambda.

 Hello. I am using RubyMine 2016.3.

 I wrote following codes in the source file test.rb. 

ary = []

f = ->(n; i) {
  i = 0
  n.times {
    ary << i
    i += 2
  }
}

f.call 7

p ary

 When I ran test.rb by ruby2.3.3, it worked with no syntax errors and displayed the next line as expected.

[0, 2, 4, 6, 8, 10, 12] 

 But source codes in the editor area of RubyMine included 4 red tildes as next image.

 Why are these red tildes displayed ? And if I should check some configurations for the editor, please point out them.

 Additionally, when I changed the lambda from arrow style ->(n; i) to  lambda {|n; i| , red tildes disappeared as next image.



Sincerely,
Junichi Yokota