Auto merge of #124895 - obeis:static-mut-hidden-ref, r=compiler-errors

Disallow hidden references to mutable static

Closes #123060

Tracking:
- #123758

Author: bors

compiler/rustc_driver_impl/src/signal_handler.rs

@@ -35,6 +35,8 @@ macro raw_errln($tokens:tt) {
 }
 
 /// Signal handler installed for SIGSEGV
+// FIXME(static_mut_refs): Do not allow `static_mut_refs` lint
+#[allow(static_mut_refs)]
 extern "C" fn print_stack_trace(_: libc::c_int) {
     const MAX_FRAMES: usize = 256;
     // Reserve data segment so we don't have to malloc in a signal handler, which might fail

compiler/rustc_error_codes/src/error_codes/E0796.md

@@ -1,14 +1,14 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 You have created a reference to a mutable static.
 
 Erroneous code example:
 
-```compile_fail,edition2024,E0796
+```
 static mut X: i32 = 23;
-
 fn work() {
   let _val = unsafe { X };
 }
-
 let x_ref = unsafe { &mut X };
 work();
 // The next line has Undefined Behavior!