-  CHANGES IN R 3.5.1 :
  BUG FIXES:
    * file("stdin") is no longer considered seekable.
    * dput() and dump() are no longer truncating when
      options(deparse.max.lines = *) is set.
    * Calls with an S3 class are no longer evaluated when printed,
      fixing part of PR#17398, thanks to a patch from Lionel Henry.
    * Allow file argument of Rscript to include space even when it is
      first on the command line.
    * callNextMethod() uses the generic from the environment of the
      calling method. Reported by Herv'e Pag`es with well documented
      examples.
    * Compressed file connections are marked as blocking.
    * optim(*, lower = c(-Inf, -Inf)) no longer warns (and switches the
      method), thanks to a suggestion by John Nash.
    * predict(fm, newdata) is now correct also for models where the
      formula has terms such as splines::ns(..) or stats::poly(..),
      fixing PR#17414, based on a patch from Duncan Murdoch.
    * simulate.lm(glm(*, gaussian(link = <non-default>))) has been
      corrected, fixing PR#17415 thanks to Alex Courtiol.
    * unlist(x) no longer fails in some cases of nested empty lists.
      Reported by Steven Nydick.
    * qr.coef(qr(<all 0, w/ colnames>)) now works.  Reported by Kun
      Ren.
    * The radix sort is robust to vectors with >1 billion elements (but
      long vectors are still unsupported). Thanks to Matt Dowle for the
      fix.
    * Terminal connections (e.g., stdin) are no longer buffered. Fixes
      PR#17432.
    * deparse(x), dput(x) and dump() now respect c()'s argument names

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