lix/lix/libexpr/builtins/warn.md

name, args

name	args
warn	msg e2

Evaluate string msg and print it on standard error. Then return e2. This function is useful for warning about unexpected conditions without aborting evaluation. If the debugger-on-warn option is set to true and the --debugger flag is given, the interactive debugger will be started when warn is called (like break).