X-Debbugs-CC: galli.87@gmail.com
Tags: patch

Advising eldoc-documentation-function sometimes resulted in a function
void symbol error. I don't know exactly why but the fact is that
eldoc-print-current-symbol-info error handler ended up printing "eldoc
error: ...". Anyway the approach seems to me a bit contorted so I
replaced the advice by a more conventional local variable and it seems
to work fine now.