test.java.file
  LAMBDA_EXPRESSION
    PARAMETER_LIST
      LPARENTH
      PARAMETER
        MODIFIER_LIST
          <empty list>
        TYPE
          INT_KEYWORD
        WHITE_SPACE
        IDENTIFIER
      COMMA
      WHITE_SPACE
      PARAMETER
        MODIFIER_LIST
          <empty list>
        TYPE
          INT_KEYWORD
        WHITE_SPACE
        IDENTIFIER
      RPARENTH
    WHITE_SPACE
    ARROW
    WHITE_SPACE
    BINARY_EXPRESSION
      REFERENCE_EXPRESSION
        REFERENCE_PARAMETER_LIST
          <empty list>
        IDENTIFIER
      WHITE_SPACE
      PLUS
      WHITE_SPACE
      REFERENCE_EXPRESSION
        REFERENCE_PARAMETER_LIST
          <empty list>
        IDENTIFIER