[Rd] S3 dispatch for S4 subclasses only works if variable "extends" is accessible from global environment

[Dirk Eddelbuettel]

On 19 April 2016 at 11:21, Hadley Wickham wrote:
| This might be too big a change - but is it worth reconsidering the
| behaviour of Rscript? Maybe the simplest fix would be simply to always
| load the methods package.  (I think historically it didn't because
| loading methods took a long time, but that is no longer true)

FWIW littler has always loaded package 'methods' at startup (because I found
this Rscript 'feature' to be too insufferable) -- and of course still starts
in about half the time as Rscript.

Dirk

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