refactor: use bug! instead of unreachable!

Author: haenoe

compiler/rustc_builtin_macros/src/autodiff.rs

@@ -208,7 +208,7 @@ mod llvm_enzyme {
             }
             Annotatable::Stmt(stmt) => match &stmt.kind {
                 ast::StmtKind::Item(iitem) => (iitem.vis.clone(), iitem.ident.clone()),
-                _ => unreachable!("stmt kind checked previously"),
+                _ => bug!("stmt kind checked previously"),
             },
             _ => {
                 dcx.emit_err(errors::AutoDiffInvalidApplication { span: item.span() });
@@ -337,13 +337,13 @@ mod llvm_enzyme {
                             iitem.attrs.push(inline_never.clone());
                         }
                     }
-                    _ => unreachable!("stmt kind checked previously"),
+                    _ => bug!("stmt kind checked previously"),
                 };
 
                 Annotatable::Stmt(stmt.clone())
             }
             _ => {
-                unreachable!("annotatable kind checked previously")
+                bug!("annotatable kind checked previously")
             }
         };
         // Now update for d_fn
@@ -387,7 +387,7 @@ mod llvm_enzyme {
                 }))
             }
             _ => {
-                unreachable!("item kind checked previously")
+                bug!("item kind checked previously")
             }
         };