Per Abrahamsen <abraham(a)dina.kvl.dk&gt; writes: > There is a lot of changes in customize like this: > > - (error "Keyword %s is missing an argument" keyword)) > + (signal 'error (list "Keyword is missing an argument" keyword))) > > What is the purpose of that change? Providing actual arguments to errors is a good idea, especially in low-level code. Code that traps the error can in that case get more context about the error without the need to parse the error message string. Most errors in XEmacs C code are signaled that way.