trait_upcasting is not currently an incomplete feature.

rust-lang · Sep 14, 2024 · 29ccc0d · 29ccc0d
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commit 29ccc0d
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diff --git a/src/doc/unstable-book/src/language-features/trait-upcasting.md b/src/doc/unstable-book/src/language-features/trait-upcasting.md
@@ -12,7 +12,6 @@ so long as `Bar: Foo`.
 
 ```rust,edition2018
 #![feature(trait_upcasting)]
-#![allow(incomplete_features)]
 
 trait Foo {}