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Sorry, it seems that you cannot see the demo. Another excuse to install byexample and test it by yourself ;)

byexample is…

…a literate programming engine where you mix ordinary text and snippets of code in the same file and then you execute them as regression tests.

You can always be sure that the examples are correct and your documentation is up to date!

The official site is https://byexamples.github.io/byexample; the repository can be found at https://github.com/byexamples/byexample.