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diff --git a/src/test/ui/fmt/ifmt-unimpl.stderr b/src/test/ui/fmt/ifmt-unimpl.stderr
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@@ -0,0 +1,13 @@
+error[E0277]: the trait bound `str: UpperHex` is not satisfied
+  --> $DIR/ifmt-unimpl.rs:2:21
+   |
+LL |     format!("{:X}", "3");
+   |                     ^^^ the trait `UpperHex` is not implemented for `str`
+   |
+   = note: required because of the requirements on the impl of `UpperHex` for `&str`
+   = note: required by `std::fmt::UpperHex::fmt`
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.