SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        EXPR_STMT
          CALL_EXPR
            PATH_EXPR
              PATH
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      CRATE_KW "crate"
                COLON2 "::"
                PATH_SEGMENT
                  NAME_REF
                    IDENT "foo"
            ARG_LIST
              L_PAREN "("
              R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
