Subject: bug#27718: 26.0.50; (cl-typep instance-ab 'class-a) gives wrong answer when compiled

From: Stefan Monnier <[email-masked]>
Date: Mon, 24 Jul 2017 15:44:58 -0400

>> +  DEFSYM (Qbyte_compile_plist_environment, "byte-compile-plist-environment");

> I find having to hardcode byte-compile-plist-environment in get rather ugly.

Hmm... I'm still not quite sure how best to deal with this, but it does
occur to me that we could introduce a new `define-propval' value, which
would be like `put' but for use at top-level.  It could differ from
`put' in that the byte-compiler could keep track of those in
byte-compile-plist-environment, and that they could record themselves in
load-history for unload-feature to be able to undo them.

It doesn't help on the `get' side, tho.

        Stefan