Auto merge of #58098 - oli-obk:maybe_allow_internal_unstable, r=petrochenkov

Require a list of features in `#[allow_internal_unstable]`

The blanket-permission slip is not great and will likely give us trouble some point down the road.

src/test/ui/feature-gates/feature-gate-allow-internal-unstable-nested-macro.rs

@@ -5,7 +5,7 @@
 macro_rules! bar {
     () => {
         // more layers don't help:
-        #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
+        #[allow_internal_unstable()] //~ ERROR allow_internal_unstable side-steps
         macro_rules! baz {
             () => {}
         }

src/test/ui/feature-gates/feature-gate-allow-internal-unstable-nested-macro.stderr

@@ -1,8 +1,8 @@
 error[E0658]: allow_internal_unstable side-steps feature gating and stability checks
   --> $DIR/feature-gate-allow-internal-unstable-nested-macro.rs:8:9
    |
-LL |         #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         #[allow_internal_unstable()] //~ ERROR allow_internal_unstable side-steps
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 ...
 LL | bar!();
    | ------- in this macro invocation

src/test/ui/feature-gates/feature-gate-allow-internal-unstable-struct.rs

@@ -1,7 +1,7 @@
 // checks that this attribute is caught on non-macro items.
 // this needs a different test since this is done after expansion
 
-#[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
+#[allow_internal_unstable()] //~ ERROR allow_internal_unstable side-steps
 struct S;
 
 fn main() {}

src/test/ui/feature-gates/feature-gate-allow-internal-unstable-struct.stderr

@@ -1,8 +1,8 @@
 error[E0658]: allow_internal_unstable side-steps feature gating and stability checks
   --> $DIR/feature-gate-allow-internal-unstable-struct.rs:4:1
    |
-LL | #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[allow_internal_unstable()] //~ ERROR allow_internal_unstable side-steps
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(allow_internal_unstable)] to the crate attributes to enable
 

src/test/ui/feature-gates/feature-gate-allow-internal-unstable.rs

@@ -1,6 +1,6 @@
 #![allow(unused_macros)]
 
-#[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
+#[allow_internal_unstable()] //~ ERROR allow_internal_unstable side-steps
 macro_rules! foo {
     () => {}
 }

src/test/ui/feature-gates/feature-gate-allow-internal-unstable.stderr

@@ -1,8 +1,8 @@
 error[E0658]: allow_internal_unstable side-steps feature gating and stability checks
   --> $DIR/feature-gate-allow-internal-unstable.rs:3:1
    |
-LL | #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | #[allow_internal_unstable()] //~ ERROR allow_internal_unstable side-steps
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(allow_internal_unstable)] to the crate attributes to enable
 

src/test/ui/internal/auxiliary/internal_unstable.rs

@@ -23,14 +23,14 @@ pub struct Bar {
 }
 
 #[stable(feature = "stable", since = "1.0.0")]
-#[allow_internal_unstable]
+#[allow_internal_unstable(function)]
 #[macro_export]
 macro_rules! call_unstable_allow {
     () => { $crate::unstable() }
 }
 
 #[stable(feature = "stable", since = "1.0.0")]
-#[allow_internal_unstable]
+#[allow_internal_unstable(struct_field)]
 #[macro_export]
 macro_rules! construct_unstable_allow {
     ($e: expr) => {
@@ -39,21 +39,21 @@ macro_rules! construct_unstable_allow {
 }
 
 #[stable(feature = "stable", since = "1.0.0")]
-#[allow_internal_unstable]
+#[allow_internal_unstable(method)]
 #[macro_export]
 macro_rules! call_method_allow {
     ($e: expr) => { $e.method() }
 }
 
 #[stable(feature = "stable", since = "1.0.0")]
-#[allow_internal_unstable]
+#[allow_internal_unstable(struct_field, struct2_field)]
 #[macro_export]
 macro_rules! access_field_allow {
     ($e: expr) => { $e.x }
 }
 
 #[stable(feature = "stable", since = "1.0.0")]
-#[allow_internal_unstable]
+#[allow_internal_unstable()]
 #[macro_export]
 macro_rules! pass_through_allow {
     ($e: expr) => { $e }

src/test/ui/internal/internal-unstable.rs

@@ -13,7 +13,7 @@ macro_rules! foo {
     }}
 }
 
-#[allow_internal_unstable]
+#[allow_internal_unstable(function)]
 macro_rules! bar {
     ($e: expr) => {{
         foo!($e,