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With run.sh, we can build and run the file in one go. This means we can also use
it as an interpreter in a shebang line and properly use the Unix executable bit.
This is pretty cool and gives a few advantages: running any executable file is
just `exec file.hs` or even `./file.hs`, finding all executables is `fd -t x`,
you don't need to specify or know an `out` name to run something, execution of a
program is standardized.
There is a hack to get this to work. In C and Common Lisp, `#!` is illegal
syntax, so I had to use shell syntax to invoke run.sh, call it on the current
file, and then exit the shell script. Meanwhile, run.sh takes the file and evals
the whole thing, building and running it. As long as either `//` or `;` is a
comment character in the target language, then this works. Maybe a better thing
to do would be to pre-process the file and remove the `#!` before passing it to
the C compiler, like [ryanmjacobs/c][1] and [tcc][2]? However this won't work in
Lisp because then I can't just load the file directly into the repl, so maybe
the comment hack needs to stay.
[1]: https://github.com/ryanmjacobs/c/tree/master
[2]: https://repo.or.cz/tinycc.git/blob/HEAD:/tccrun.c
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