Allow internal_features lint in doc tests

Rustdoc forwards -Zcrate-attr=feature(rustdoc_internals) to doc tests,
but deny(warnings) overrides the -Ainternal_features.

compiler/rustc_arena/src/lib.rs

@@ -12,7 +12,7 @@
 #![allow(internal_features)]
 #![cfg_attr(test, feature(test))]
 #![deny(unsafe_op_in_unsafe_fn)]
-#![doc(test(no_crate_inject, attr(deny(warnings))))]
+#![doc(test(no_crate_inject, attr(deny(warnings), allow(internal_features))))]
 #![feature(core_intrinsics)]
 #![feature(decl_macro)]
 #![feature(dropck_eyepatch)]

compiler/rustc_ast/src/lib.rs

@@ -5,7 +5,7 @@
 //! This API is completely unstable and subject to change.
 
 // tidy-alphabetical-start
-#![doc(test(attr(deny(warnings))))]
+#![doc(test(attr(deny(warnings), allow(internal_features))))]
 #![feature(array_windows)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]

compiler/rustc_graphviz/src/lib.rs

@@ -270,7 +270,7 @@
 //! * [DOT language](https://www.graphviz.org/doc/info/lang.html)
 
 // tidy-alphabetical-start
-#![doc(test(attr(allow(unused_variables), deny(warnings))))]
+#![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
 // tidy-alphabetical-end
 
 use std::borrow::Cow;

compiler/rustc_parse_format/src/lib.rs

@@ -8,7 +8,7 @@
 // We want to be able to build this crate with a stable compiler,
 // so no `#![feature]` attributes should be added.
 #![deny(unstable_features)]
-#![doc(test(attr(deny(warnings))))]
+#![doc(test(attr(deny(warnings), allow(internal_features))))]
 // tidy-alphabetical-end
 
 use std::ops::Range;

compiler/rustc_public/src/lib.rs

@@ -7,7 +7,7 @@
 //! This API is still completely unstable and subject to change.
 
 #![allow(rustc::usage_of_ty_tykind)]
-#![doc(test(attr(allow(unused_variables), deny(warnings))))]
+#![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
 #![feature(sized_hierarchy)]
 //!
 //! This crate shall contain all type definitions and APIs that we expect third-party tools to invoke to

compiler/rustc_public_bridge/src/lib.rs

@@ -13,7 +13,7 @@
 
 // tidy-alphabetical-start
 #![allow(rustc::usage_of_ty_tykind)]
-#![doc(test(attr(allow(unused_variables), deny(warnings))))]
+#![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
 #![feature(sized_hierarchy)]
 #![feature(trait_alias)]
 // tidy-alphabetical-end

compiler/rustc_serialize/src/lib.rs

@@ -4,7 +4,7 @@
 #![allow(internal_features)]
 #![allow(rustc::internal)]
 #![cfg_attr(test, feature(test))]
-#![doc(test(attr(allow(unused_variables), deny(warnings))))]
+#![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
 #![feature(core_intrinsics)]
 #![feature(min_specialization)]
 #![feature(never_type)]