class Steep::Index::RBSIndex::ConstantEntry

def add_declaration(decl)
  case decl
  when RBS::AST::Declarations::Constant, RBS::AST::Ruby::Declarations::ConstantDecl
    declarations << decl
  else
    raise
  end
  self
end

def initialize(const_name:)
  @const_name = const_name
  @declarations = Set[]
end