Error reporting info in compiled templates

Greetings,

We are using Smarty in a system that needs a little more than a simple
template engine and the plug-ins system is the one that allows for that. We
basically provide plug-ins for data retrieval inside the templates and let
designers organize their templates the way they see fit and put in the
content of their choice.

What I believe is missing from Smarty right now though (that is if I'm not
mistaken), is the debugging info inside the compiled templates that we'd use
for instance to report exact errors to the designers. A data retrieval
plug-in that needs to report an error to the designer can currently either
use Smarty's trigger_error method that doesn't tell the designer much or
play around with backtraces and Smarty private variables to try to figure
out the template name, the line number and the plug-in name that the
designer needs to track down the problem, and all this time hoping that you
don't stumble upon PHP bugs in backtraces and the like. Needless to say this
solution is neither scalable nor does it guarantee consistency with future
versions of Smarty.

The solution would be to track debug info in compiled templates either as
PHP statements that fill in variables or as PHP comments with special
prefixes that don't add any more processing weight to the templates and can
be easily searched for in case error reporting is needed.

This is just the incentive of the idea but I'd first like to know if such a
system already exists or if anyone is already working on something related
and also if the project's coordinators would be interested in such a thing.

Daniel