SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        EXPR_STMT
          BLOCK_EXPR
            ASYNC_KW "async"
            WHITESPACE " "
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n    "
        EXPR_STMT
          BLOCK_EXPR
            ASYNC_KW "async"
            WHITESPACE " "
            MOVE_KW "move"
            WHITESPACE " "
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n\n"