Adds a directory to the list of directories to be searched when looking for source files.
use [directory]
Issue the use command to add directory to the front of the list of directories Prism is to search when looking for source files. This is useful if you have moved a source file since compiling the program, or if for some other reason Prism can't find the file. If you do not specify a directory, use prints the current list.
No matter what the contents of the directory list is, Prism always searches first in the directory in which the program was compiled.