rustdoc generates invalid link: `url#impl-id/method.name`

[RalfJung]

I spotted this in these search results: the TyCtxt::adt_def result links to https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html#impl-TyCtxt%3C'tcx%3E/method.adt_def which is not a valid link.

Cc @rust-lang/rustdoc

[camelid]

cc @notriddle -- I think these are supposed to be autoredirected in JS?

[notriddle]

Okay...

This happens because there's more than one impl<'tcx> TyCtxt<'tcx> and the one we want is currently named #impl-TyCtxt%3C'tcx%3E-35. The URL escaping is fine; the -35 is the problem.