update_list fails when new and old element is a list

[vspinu]

It seem to fail in the case of a transformations only:

These two work as expected:

> str(update_list(list(a = 1, b = 2), a = ~ list(a)))
List of 2
 $ a:List of 1
  ..$ : num 1
 $ b: num 2

> str(update_list(list(a = 1, b = 2), c = ~ list(a)))
List of 3
 $ a: num 1
 $ b: num 2
 $ c:List of 1
  ..$ : num 1

This one fails

> str(update_list(list(a = list(1), b = 2), a = ~ list(a)))
List of 2
 $ a:List of 1
  ..$ : num 1
 $ b: num 2

Expected result contains a doublly nested list:

> str(list(a = list(list(1)), b = 2))
List of 2
 $ a:List of 1
  ..$ :List of 1
  .. ..$ : num 1
 $ b: num 2

[hadley]

Seems to be a bug in the underlying modifyList()

[hadley]

Ah, no, modifyList() only replaces by name, not position. Seems reasonable to fall back to position if there are no names