You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: collection.rb
    path of file: ./repos/steep/lib/steep/ast/annotation
    
    the code of the file until where you have to start completion: module Steep
  module AST
    module Annotation
      class Collection
        attr_reader :annotations
        attr_reader :factory
        attr_read
    
        def var_type(lvar: nil, ivar: nil, const: nil)
          case
          when lvar
            absolute_type(var_type_annotations[lvar]&.type)
          when ivar
            absolute_type(ivar_type_annotations[ivar]&.type)
          when const
            absolute_type(const_type_annotations[const]&.type)
          end