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ac0a9c58e8
Import the 2021 prelude in the core crate The `core` crate currently imports the v1 prelude https://github.com/rust-lang/rust/blob/b3df0d7e5ef5f7dbeeca3fb289c65680ad013f87/library/core/src/lib.rs#L285-L287 This recently caused an issue when updating the `portable-simd` subtree since it was using a trait that was added to the 2021 prelude: https://github.com/rust-lang/rust/pull/122905#discussion_r1536228822 To make it easier to have a consistent build environment for subtrees and submodules that get included in `core`, we will now import the 2021 prelude into `core`. Fixes #122912 r? `@Nilstrieb`