Rollup merge of #118123 - RalfJung:internal-lib-features, r=compiler-errors
Add support for making lib features internal We have the notion of an "internal" lang feature: a feature that is never intended to be stabilized, and using which can cause ICEs and other issues without that being considered a bug. This extends that idea to lib features as well. It is an alternative to https://github.com/rust-lang/rust/pull/115623: instead of using an attribute to declare lib features internal, we simply do this based on the name. Everything ending in `_internals` or `_internal` is considered internal. Then we rename `core_intrinsics` to `core_intrinsics_internal`, which fixes https://github.com/rust-lang/rust/issues/115597.
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#![cfg(feature = "sysroot-abi")]
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#![feature(proc_macro_internals, proc_macro_diagnostic, proc_macro_span)]
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#![warn(rust_2018_idioms, unused_lifetimes, semicolon_in_expressions_from_macros)]
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#![allow(unreachable_pub)]
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#![allow(unreachable_pub, internal_features)]
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extern crate proc_macro;
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