Runscript 1.2.0 Release Candidate 1

Nonexistent positional arguments, such as in the following example, will evaluate to an empty string if they are left unspecified, instead of panicking.

$ cat run
test $1 '==' '' && echo 'yay!'
$ run

Errors in included files will print a message acknowledging the nested nature of the error, instead of panicking. This behaviour will be expanded into a 'stack trace' in the next minor version