inversion-reverse-test

inversion-reverse-test is a compiled Lisp function in `inversion.el'.

(inversion-reverse-test PACKAGE OLDVERSION &rest RESERVED)

Test that PACKAGE at OLDVERSION is still compatible.
If something like a save file is loaded at OLDVERSION, this
test will identify if OLDVERSION is compatible with the current version
of PACKAGE.
PACKAGE is a symbol, similar to what is passed to `require'.
OLDVERSION is of similar format to return entries of
`inversion-decode-version', or a classic version string.
RESERVED arguments are kept for a later user.
This depends on the symbols `PACKAGE-version' and optionally
`PACKAGE-incompatible-version' being defined in PACKAGE.
Return nil if everything is ok. Return an error string otherwise.