Add private arg to fmt::UnsafeArg

rust-lang · Sep 30, 2021 · f5e4f78 · f5e4f78
1 parent 6dc08b9
commit f5e4f78
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs
@@ -270,9 +270,10 @@ pub struct ArgumentV1<'a> {
 /// of `format_args!(..)` and reduce the scope of the `unsafe` block.
 #[allow(missing_debug_implementations)]
 #[doc(hidden)]
-#[non_exhaustive]
 #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]
-pub struct UnsafeArg;
+pub struct UnsafeArg {
+    _private: (),
+}
 
 impl UnsafeArg {
     /// See documentation where `UnsafeArg` is required to know when it is safe to
@@ -281,7 +282,7 @@ impl UnsafeArg {
     #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]
     #[inline(always)]
     pub unsafe fn new() -> Self {
-        Self
+        Self { _private: () }
     }
 }