statistics collector: number of function calls

Hi,

I'd find it useful if the statistics collector (or someone else) counted
the number of times a function was called (or whether it was called at
all). Given that PL/pgSQL-Functions are compiled only at the first call
this would provide for a possibility to check whether every function has
been used and therefore compiled successfully during a test run of an
application.

Is something like this planned or already available, but hidden well?

Thanks

--
Markus Bertheau <twanger(at)bluetwanger(dot)de>