>>>>> On Sat, 11 Mar 2017, Michał Górny wrote:

> Split the estack_* and related functions from eutils into a
> dedicated estack.eclass. Those functions have significant complexity
> and are not used frequently, therefore they benefit from having a
> separate file and an explicit dedicated maintainer.

This (and the other new eclass as well) might benefit from protection
against inheriting it multiple times:

if [[ -z ${_ESTACK_ECLASS} ]]; then
_ESTACK_ECLASS=1
# main eclass code here
fi