Looking at pages like [this one](https://doc.rust-lang.org/nightly/nightly-rustc/rustc/mir/interpret/struct.Allocation.html), I feel there used to be `[src]` links there to directly view the method source code, but those links are gone now. I am not sure if this is indeed a regression (I might be misremembering), but in any case having these links would be really useful.
