$ ./tesh --log="log.thresh:info tesh.fmt:%m%n"
> Test unit from stdin
> [stdin:1] Undefined variable `(include-file)'
-> Test unit `(stdin)' : NOK (syntax error)
+> Test unit `stdin': NOK (<stdin:1> syntax error)
# A single sample of the usage of the tesh variables
$ ./tesh --log="log.thresh:info tesh.fmt:%m%n"
> Test unit from stdin
> [stdin:1] A system variable named `(ENOENT)' already exists
-> Test unit `(stdin)' : NOK (syntax error)
+> Test unit `stdin': NOK (<stdin:1> syntax error)
