SOURCE_FILE
  TYPE_ALIAS
    TYPE_KW "type"
    WHITESPACE " "
    NAME
      IDENT "X"
    WHITESPACE " "
    EQ "="
    WHITESPACE " "
    PATH_TYPE
      PATH
        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 ">"
        COLON2 "::"
        PATH_SEGMENT
          NAME_REF
            IDENT "Output"
    SEMICOLON ";"
  WHITESPACE "\n"
  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
                    TYPE_ANCHOR
                      L_ANGLE "<"
                      PATH_TYPE
                        PATH
                          PATH_SEGMENT
                            NAME_REF
                              IDENT "usize"
                      WHITESPACE " "
                      AS_KW "as"
                      WHITESPACE " "
                      PATH_TYPE
                        PATH
                          PATH_SEGMENT
                            NAME_REF
                              IDENT "Default"
                      R_ANGLE ">"
                COLON2 "::"
                PATH_SEGMENT
                  NAME_REF
                    IDENT "default"
            ARG_LIST
              L_PAREN "("
              R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
