gtools-defunct: Defunct Functions in package 'gtools'
In gtools: Various R Programming Tools

assert

R Documentation

Defunct Functions in package `gtools`

The functions or variables listed here are no longer part of package gtools.

assert(...)

capture(expression, collapse = "\n")

sprint(x, ...)

expression, collapse, x, ...

ignored

assert is a defunct synonym for stopifnot.
addLast has been replaced by lastAdd, which has the same purpose but applied using different syntax.
capture and capture.output have been removed in favor of capture.output from the utils package.