Add internal_features lint

It lints against features that are inteded to be internal to the
compiler and standard library. Implements MCP #596.

We allow `internal_features` in the standard library and compiler as those
use many features and this _is_ the standard library from the "internal to the compiler and
standard library" after all.

Marking some features as internal wasn't exactly the most scientific approach, I just marked some
mostly obvious features. While there is a categorization in the macro,
it's not very well upheld (should probably be fixed in another PR).

We always pass `-Ainternal_features` in the testsuite
About 400 UI tests and several other tests use internal features.
Instead of throwing the attribute on each one, just always allow them.
There's nothing wrong with testing internal features^^

Author: Noratrieb

compiler/rustc_abi/src/lib.rs

@@ -1,4 +1,5 @@
 #![cfg_attr(feature = "nightly", feature(step_trait, rustc_attrs, min_specialization))]
+#![cfg_attr(all(not(bootstrap), feature = "nightly"), allow(internal_features))]
 
 use std::fmt;
 #[cfg(feature = "nightly")]

compiler/rustc_arena/src/lib.rs

@@ -23,6 +23,7 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
+#![cfg_attr(not(bootstrap), allow(internal_features))]
 #![allow(clippy::mut_from_ref)] // Arena allocators are one of the places where this pattern is fine.
 
 use smallvec::SmallVec;

compiler/rustc_borrowck/src/lib.rs

@@ -11,6 +11,7 @@
 #![feature(trusted_step)]
 #![feature(try_blocks)]
 #![recursion_limit = "256"]
+#![cfg_attr(not(bootstrap), allow(internal_features))]
 
 #[macro_use]
 extern crate rustc_middle;

compiler/rustc_data_structures/src/lib.rs

@@ -37,6 +37,7 @@
 #![allow(rustc::potential_query_instability)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
+#![cfg_attr(not(bootstrap), allow(internal_features))]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 #[macro_use]

compiler/rustc_error_codes/src/error_codes/E0092.md

@@ -4,6 +4,7 @@ Erroneous code example:
 
 ```compile_fail,E0092
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     fn atomic_foo(); // error: unrecognized atomic operation
@@ -17,6 +18,7 @@ functions are defined in `compiler/rustc_codegen_llvm/src/intrinsic.rs` and in
 
 ```
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     fn atomic_fence_seqcst(); // ok!

compiler/rustc_error_codes/src/error_codes/E0093.md

@@ -4,6 +4,7 @@ Erroneous code example:
 
 ```compile_fail,E0093
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     fn foo(); // error: unrecognized intrinsic function: `foo`
@@ -22,6 +23,7 @@ functions are defined in `compiler/rustc_codegen_llvm/src/intrinsic.rs` and in
 
 ```
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     fn atomic_fence_seqcst(); // ok!

compiler/rustc_error_codes/src/error_codes/E0094.md

@@ -4,6 +4,7 @@ Erroneous code example:
 
 ```compile_fail,E0094
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     #[rustc_safe_intrinsic]
@@ -18,6 +19,7 @@ Example:
 
 ```
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     #[rustc_safe_intrinsic]

compiler/rustc_error_codes/src/error_codes/E0208.md

@@ -8,6 +8,7 @@ Erroneous code example:
 ```compile_fail
 // NOTE: this feature is perma-unstable and should *only* be used for
 //       testing purposes.
+#![allow(internal_features)]
 #![feature(rustc_attrs)]
 
 #[rustc_variance]

compiler/rustc_error_codes/src/error_codes/E0211.md

@@ -5,6 +5,7 @@ used. Erroneous code examples:
 
 ```compile_fail
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     #[rustc_safe_intrinsic]
@@ -41,6 +42,7 @@ For the first code example, please check the function definition. Example:
 
 ```
 #![feature(intrinsics)]
+#![allow(internal_features)]
 
 extern "rust-intrinsic" {
     #[rustc_safe_intrinsic]

compiler/rustc_error_codes/src/error_codes/E0230.md

@@ -5,6 +5,7 @@ compiled:
 
 ```compile_fail,E0230
 #![feature(rustc_attrs)]
+#![allow(internal_features)]
 
 #[rustc_on_unimplemented = "error on `{Self}` with params `<{A},{B}>`"] // error
 trait BadAnnotation<A> {}