As I am sure all of you have done this at some time or another, I sometimes introduce a syntax error into a program due to being all thumbs. Also, it is sometimes not possible to run a test of the program at the time I make a change. Then later, BANG! My error is revealed when I do get around to running the program.
I think it would be really helpful if there was a command line option available that would only run the Rexx prescan of the program and then stop. That way any obvious syntax errors would be revealed without actually running the program.