[saevarom]

I tried running this on a Mac but got an error. Assumed it was because of some sed version difference. Perhaps the code on Github is just broken.

[kritixilithos]

That's probably because you used BSD sed. Running it on my BSD sed also gives an error, presumably because it thinks the `}` is a part of the label in `binput}`.

However it works fine in GNU sed, and now that you mention it, GNU sed's extensions were not used, like the `-z` flag to slurp all input in one "line" to avoid `:input;$!{N;binput}`.

[bjoko]

On macOS: install gnu-sed via Homebrew.