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-To learn more about how Higher-ranked trait bounds work in the _old_ trait
-solver, see [this chapter][oldhrtb] of the rustc-dev-guide.
-
-To learn more about how they work in the _new_ trait solver, see [this
-chapter][newhrtb].
-
-[oldhrtb]: https://rustc-dev-guide.rust-lang.org/traits/hrtb.html
-[newhrtb]: https://rustc-dev-guide.rust-lang.org/borrow_check/region_inference.html#placeholders-and-universes