Add expand rust macro button

[sigmaSd]

context: Veykril/tlborm#16

If this is an accepted feature, I'll try to figure out if I can add syntax highlighting to the result.

[sigmaSd]

For highlighting , using this code on the console:

Array
            .from(document.querySelectorAll('code:not(.editable)'))
            .forEach(function (block) { hljs.highlightBlock(block); });

The highlighting is incorrect, it greys out most of the code (image truncuated)

[ehuss]

I don't think this is something we can do using the playground, as we can't use arbitrary endpoints in their API.

I might suggest putting the examples in separate rust files, using rustdoc_include to embed them in the book, have a separate script which will run cargo expand on the examples, and use javascript/css to provide some kind of "expand" button to show those expanded results.

[sigmaSd]

Understandable, thanks for the suggestion I'll ping the author about it.