I recall some time ago, the break and backtrace capability of Hunchentoot was removed, perhaps to make it less platform dependent. But I still find myself often trying to find the origin of cryptic error messages, and adding FORMAT and BREAK statements to narrow down the problem area. What is a good way to drop in support for, say, SBCL, so that an error will break into the debugger with a backtrace, or even dump the backtrace to the log file?