Attached is a very simple example program: main calls f, which calls g, which calls h, which calls error. I tried building this with hat ("hmake -hat Foo"), running it ("./Foo") and then using hat-stack ("hat-stack Foo"). But hat-stack reported no useful information. The only output was as follows: | Program terminated with error: | {in h} | Virtual stack trace: source file/line/col | _|_ no source reference | _|_ no source reference ... the same line above, repeated another 62 times ... | _|_ no source reference | _|_ no source reference I also tried using hat-trail, but I couldn't get any useful information out of that either. I am using the latest CVS version of hat with ghc 6.2. Also, hat-trail failed to properly restore the tty state after ":q". -- Fergus J. Henderson | "I have always known that the pursuit Galois Connections, Inc. | of excellence is a lethal habit" Phone: +1 503 626 6616 | -- the last words of T. S. Garp.