Issue 569 in robotframework: Non-existing variable in user keyword return value very hard to debug

[robotframework]

Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 569 by cdek...@gmail.com: Non-existing variable in user keyword  
return value very hard to debug
http://code.google.com/p/robotframework/issues/detail?id=569

If I (accidentally) specify a non-existing variable name as the return
value for a user keyword, the resulting error is very obscure and hard to
debug. The error message only mentions a non-existing variable and is
printed in between test steps in the log, making it very non-obvious where
the error originated.

It would be very helpful if the error message at least mentions that the
non-existing variable is the return value of the keyword.

RF 2.1.3 running on Python 2.6.5 (Kubuntu 10.04)