1 files changed, 15 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-21596.stderr b/tests/ui/issues/issue-21596.stderr
new file mode 100644
index 000000000..a336d1b0e
--- /dev/null
+++ b/tests/ui/issues/issue-21596.stderr
@@ -0,0 +1,15 @@
+error[E0599]: `*const u8` doesn't implement `std::fmt::Display`
+  --> $DIR/issue-21596.rs:4:22
+   |
+LL |     println!("{}", z.to_string());
+   |                      ^^^^^^^^^ `*const u8` cannot be formatted with the default formatter
+   |
+   = note: try using `<*const T>::as_ref()` to get a reference to the type behind the pointer: https://doc.rust-lang.org/std/primitive.pointer.html#method.as_ref
+   = note: using `<*const T>::as_ref()` on a pointer which is unaligned or points to invalid or uninitialized memory is undefined behavior
+   = note: the following trait bounds were not satisfied:
+           `*const u8: std::fmt::Display`
+           which is required by `*const u8: ToString`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0599`.