Now, such 'rx' expressions generate an error.
---
-** Internal 'rx' functions and variables have been removed.
-As a consequence of an improved implementation of the 'rx' package,
-internal functions and variables have been removed. Packages using
-theses should use the public 'rx' and 'rx-to-string' instead.
+** Internal 'rx' functions and variables have been removed,
+as a consequence of an improved implementation. Packages using
+these should use the public 'rx' and 'rx-to-string' instead.
'rx-constituents' is still available for compatibility, but the new
extension mechanism is preferred: 'rx-define', 'rx-let' and
'rx-let-eval'.