4gl isn’t catching blatant errors (like number of arguments when opening a cursor) at compile time.  (Hopefully they all get caught before production…)

I have to commit my buggy code into SCCS if I want %C% replaced with line numbers in my error statements.

I have to manually check code back out after each commit, at which point the file is changed, so my editor reloads it. I lose my place each time.