Pattern: Missing use of to_set
Issue: -
Looks for uses of map.to_set or collect.to_set that could be written with just to_set.
# bad
something.map { |i| i * 2 }.to_set
# good
something.to_set { |i| i * 2 }
# bad
[1, 2, 3].collect { |i| i.to_s }.to_set
# good
[1, 2, 3].to_set { |i| i.to_s }