Hi, I have the following problem. I use defsystem to compile and load systems. When the source file is newer than the compiled file CMUCL asks whether to compile and load the source file. Somehow SLIME mis-parses this and the answer to this query is treated as a fresh input. I took a brief look at the slime elisp and swank-cmucl sources, but I do not understand the architecture enough to even attempt a patch... I haven't tried it with othe lisp implementattions to see if it is an issue with defsystem or with cmucl... -- archi Attached are cut-and pasted buffers : In SLIME repl buffer: POLY> (mk:load-system 'mathematics) ; Loading #p"/home/archi/vision/genomics/code/CLisp/newmath/mathematics-package.x86f". ; Loading #p"/home/archi/vision/genomics/code/CLisp/newmath/common-math.x86f". ; Loading #p"/home/archi/vision/genomics/code/CLisp/newmath/polynomials/polynomials-pkg.x86f". ; - Binary file /home/archi/vision/genomics/code/CLisp/newmath/polynomials/polynomials.x86f is old or does not exist. ; Compile (and load) source file /home/archi/vision/genomics/code/CLisp/newmath/polynomials/polynomials.lisp instead? y ; Evaluation aborted ; Evaluation aborted ; Compilation unit aborted. POLY> POLY> In sldb debugger buffer: Error in KERNEL::UNBOUND-SYMBOL-ERROR-HANDLER: the variable Y is unbound. [Condition of type UNBOUND-VARIABLE] Restarts: 0: [ABORT] Abort handling SLIME request. 1: [ABORT] Return to Top-Level. Backtrace: 0: (EVAL Y) 1: (SWANK::EVAL-REGION "y " T) ...