werrstr - set the system error string .EX include "sys.m"; sys := load Sys Sys->PATH; werrstr(s: string): int; When a system call fails, it returns an error value (often -1) and records a string describing the error in a per-process location. The verb r in sys-print (2) outputs the error string. Werrstr sets the process's error string to s , to allow a function in a module to mimic the error reporting interface of a system call. sys-intro (2), sys-print (2)