I'm not familiar with lisp loop macros, but here is how this works. For example the Tcl does not have try-catch-finally statement. If that happens in other lan

I'm not familiar with lisp loop macros, but here is how this works. For example the Tcl does not have try-catch-finally statement. If that happens in other languages you just need to accept it. In Tcl you can implement it yourself for example: http://code.activestate.com/recipes/68396-try-catch-finally/ http://code.activestate.com/recipes/68396-try-catch-finally/