rustc-ap-rustc_attr 707.0.0

Automatically published version of the package `rustc_attr` in the rust-lang/rust repository from commit 42a4673fbd40b09a99d057eaa9b3e5579b54c184 The publishing script for this crate lives at: failed to build rustc-ap-rustc_attr-707.0.0
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Visit the last successful build: rustc-ap-rustc_attr-656.0.0

Functions and types dealing with attributes and meta items.

FIXME(Centril): For now being, much of the logic is still in rustc_ast::attr. The goal is to move the definition of MetaItem and things that don't need to be in syntax to this crate.