For example [this page](https://doc.rust-lang.org/nightly/std/slice/trait.SliceIndex.html#implementors) doesn't fold trait implementors by default. It would be nice to fold all trait implementors by default for fast skimming all implementors.  
For example this page doesn't fold trait implementors by default.
It would be nice to fold all trait implementors by default for fast skimming all implementors.

