NoMethodError when method(sym) used for ParameterType.transformer #1788

Feature: Reproduction for issue #1788
  Scenario: Using a top-level method() to populate the transformer of a ParameterType
    Given a file named "features/test.feature" with:
      """
      Feature: Example
        Scenario: Sample
          Given a path named "example"
      """
    And a file named "features/support/env.rb" with:
      """
      require "pathname"
      ParameterType(
        name:        "path",
        regexp:      /"([^"]*)"/,
        transformer: method(:Pathname),
      )
      """
    And a file named "features/step_definitions/all.rb" with:
      """
      Given("a path named {path}") do |actual|
        expected = Pathname("example")
        fail [actual, expected].inspect unless actual == expected
      end
      """
    When I run `cucumber -q`
    Then it should pass with:
      """
      Feature: Reprod
      
        Scenario: Example
          Given a path named "example"
      
      1 scenario (1 passed)
      1 step (1 passed)
      """