[Rd] problem with pipes, textConnection and read.dcf

[Gabor Grothendieck]

This gives an error bit if the first gsub line is commented out then there is no
error even though it is equivalent code.

  L <- c("Variable:id", "Length:112630     ")

  L |>
    gsub(pattern = " ", replacement = "") |>
    gsub(pattern = " ", replacement = "") |>
    textConnection() |>
    read.dcf()
  ## Error in textConnection(gsub(gsub(L, pattern = " ", replacement = ""),  :
  ##  argument 'object' must deparse to a single character string

That is this works:

  L |>
    # gsub(pattern = " ", replacement = "") |>
    gsub(pattern = " ", replacement = "") |>
    textConnection() |>
    read.dcf()
  ##      Variable Length
  ## [1,] "id"     "112630"

  R.version.string
  ## [1] "R version 4.1.0 RC (2021-05-16 r80303)"
  win.version()
  ## [1] "Windows 10 x64 (build 19042)"

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