What is the meaning / use of the third argument fname in include_string?
I saw it used this way in IJulia:
include_string(Main, code, "In[$n]")
where n is a number (say 1), In is a mapping of Int to String, which stores code string. So if n=1, In contains code.
I tried the following in the REPL
include_string(Main, "a=1; a+a", "s")
which works at intended, but I do not get the purpose of the third argument.