[RFC-2011] Allow core_intrinsics when activated

compiler/rustc_builtin_macros/src/assert/context.rs

@@ -58,7 +58,6 @@ pub(super) fn new(cx: &'cx ExtCtxt<'a>, span: Span) -> Self {
     /// Builds the whole `assert!` expression. For example, `let elem = 1; assert!(elem == 1);` expands to:
     ///
     /// ```rust
-    /// #![feature(generic_assert_internals)]
     /// let elem = 1;
     /// {
     ///   #[allow(unused_imports)]

library/core/src/macros/mod.rs

@@ -1534,7 +1534,12 @@ macro_rules! include {
     #[rustc_builtin_macro]
     #[macro_export]
     #[rustc_diagnostic_item = "assert_macro"]
-    #[allow_internal_unstable(panic_internals, edition_panic, generic_assert_internals)]
+    #[allow_internal_unstable(
+        core_intrinsics,
+        panic_internals,
+        edition_panic,
+        generic_assert_internals
+    )]
     macro_rules! assert {
         ($cond:expr $(,)?) => {{ /* compiler built-in */ }};
         ($cond:expr, $($arg:tt)+) => {{ /* compiler built-in */ }};