Location
https://doc.rust-lang.org/rustc/lints/listing/allowed-by-default.html#example-15
Summary
multiple_supertrait_upcastable lint example is unexpectedly producing a unknown_lints warning
either #![feature(multiple_supertrait_upcastable)] should be added and the documentation should be ran in nightly if not already, or the lint should be made stable
Location
https://doc.rust-lang.org/rustc/lints/listing/allowed-by-default.html#example-15
Summary
multiple_supertrait_upcastablelint example is unexpectedly producing aunknown_lintswarningeither
#![feature(multiple_supertrait_upcastable)]should be added and the documentation should be ran in nightly if not already, or the lint should be made stable