SLIME User Manual - Common Lisp.net

Chapter 3: slime-mode 10A more subtle issue is that imperfect caching is used for the sake of performance. 1 Inan ideal world, Lisp would automatically scan every symbol for indentation changes aftereach command from Emacs. However, this is too expensive to do every time. Instead Lispusually just scans the symbols whose home package matches the one used by the Emacsbuffer where the request comes from. That is sufficient to pick up the indentation of mostinteractively-defined macros. To catch the rest we make a full scan of every symbol eachtime a new Lisp package is created between commands – that takes care of things like newsystems being loaded.You can use M-x slime-update-indentation to force all symbols to be scanned forindentation information.3.4 Reader conditional fontificationslime automatically evaluates reader-conditional expressions in source buffers and “graysout” code that will be skipped for the current Lisp connection.1 Of course we made sure it was actually too slow before making the ugly optimization.