The Run buttons use play.r-l.o, doesn't have any crates

[dtolnay]

Some but not all of these examples would work if run with play.integer32.com instead.

[brson]

Yeah, not sure what do do. Maybe someday we can coordinate with play on a canonical crate list so that it mostly works.

[budziq]

Hi, I am really hyped for this initiative.

Having cookbook spew compilation errors makes it less approachable and and reliable in the eyes of total newcommers (like myself).

I would suggest:

• disabling playpen for examples that are known not to work (if it is possible in mdbook)
• disabling playpen for all examples - for consistency sake
• using alternative playground (maybe with direct links) - https://play.integer32.com seams to have a good deal of crates preintalled and all of the (few) examples that I have checked work out of the box https://play.integer32.com/?gist=c0f035b47e1098793def1b8f23780e4c&version=undefined

[dtolnay]

For now I axed the Run buttons entirely in 323795e.

[dtolnay]

I opened https://github.com/brson/rust-cookbook/issues/87 to put back the "Run" button if we can make it work.