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The standard library API docs allow us running example code at https://play.rust-lang.org/ (which powered by playpen). But there're only very little amount of crates (i.g. num, frunk, rusqbin) on crates.io have this feature. Most other crate authors don't know about
#![doc(html_playground_url = "https://play.rust-lang.org/")]
, or forget adding it to crate root.Since rustdoc has
--playground-url
option (cc rust-lang/rust#37763), it's time to apply playpen by default to all crates.io crates. For crates have their own#![doc(html_playground_url = "URL")]
, nothing will be changed.