Minic rustc's new format_args! expansion

crates/ide-diagnostics/src/handlers/missing_unsafe.rs

@@ -628,6 +628,17 @@ fn main() {
     #[test]
     fn orphan_unsafe_format_args() {
         // Checks that we don't place orphan arguments for formatting under an unsafe block.
+        check_diagnostics(
+            r#"
+//- minicore: fmt_before_1_89_0
+fn foo() {
+    let p = 0xDEADBEEF as *const i32;
+    format_args!("", *p);
+                  // ^^ error: dereference of raw pointer is unsafe and requires an unsafe function or block
+}
+        "#,
+        );
+
         check_diagnostics(
             r#"
 //- minicore: fmt
@@ -958,4 +969,18 @@ impl FooTrait for S2 {
         "#,
         );
     }
+
+    #[test]
+    fn no_false_positive_on_format_args_since_1_89_0() {
+        check_diagnostics(
+            r#"
+//- minicore: fmt
+fn test() {
+    let foo = 10;
+    let bar = true;
+    let _x = format_args!("{} {0} {} {last}", foo, bar, last = "!");
+}
+            "#,
+        );
+    }
 }