SOURCE_FILE
  TYPE_ALIAS
    TYPE_KW "type"
    WHITESPACE " "
    NAME
      IDENT "X"
    WHITESPACE " "
    EQ "="
    WHITESPACE " "
    PATH_TYPE
      PATH
        PATH_SEGMENT
          TYPE_ANCHOR
            L_ANGLE "<"
            TUPLE_TYPE
              L_PAREN "("
              R_PAREN ")"
            R_ANGLE ">"
    SEMICOLON ";"
  WHITESPACE "\n"
  TYPE_ALIAS
    TYPE_KW "type"
    WHITESPACE " "
    NAME
      IDENT "Y"
    WHITESPACE " "
    EQ "="
    WHITESPACE " "
    PATH_TYPE
      PATH
        PATH_SEGMENT
          TYPE_ANCHOR
            L_ANGLE "<"
            PATH_TYPE
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "A"
            WHITESPACE " "
            AS_KW "as"
            WHITESPACE " "
            PATH_TYPE
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "B"
            R_ANGLE ">"
    SEMICOLON ";"
  WHITESPACE "\n"
error 13: expected `::`
error 32: expected `::`
