TeX’s \let assignment does not work for LaTeX macros with optional arguments or for macros that are defined as robust macros by \DeclareRobustCommand. This package defines \LetLtxMacro that also takes care of the involved internal macros.
The package is part of the oberdiek bundle.
The author is Heiko Oberdiek. The package is Copyright © 2008,2010 Heiko Oberdiek.
License: lppl1.3 Version: 1.5, dated: 2016-05-16 Catalogued: 2016-05-18