Hello all,

  In one of the packages (phylobase) I'm contributing to, we define a class
as follows:

setClass("phylo4",
         representation(edge = "matrix",
                        edge.length = "numeric",
                        label = "character",
                        edge.label = "character",
                        order = "character",
                        annote = "list"),
         prototype = list(
                        edge = matrix(nrow = 0, ncol = 2,
                            dimname = list(NULL, c("ancestor",
"descendant"))),
                        edge.length = numeric(0),
                        label = character(0),
                        edge.label = character(0),
                        order = "unknown",
                        annote = list()
                       ),
         validity = checkPhylo4)

  Using today's SVN checkout (r61643), building an object of the class
'phylo4' like this:

phylo4(foo, annote="bar")

  doesn't return an error as it used to (given that annote is not a list).

  What is now the preferred way of checking that annote is a actually a
list?

  Thanks,
  -- François

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