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diff --git a/src/test/ui/macros/unreachable-format-args.edition_2015.stderr b/src/test/ui/macros/unreachable-format-args.edition_2015.stderr
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+++ b/src/test/ui/macros/unreachable-format-args.edition_2015.stderr
@@ -0,0 +1,12 @@
+error: there is no argument named `x`
+ --> $DIR/unreachable-format-args.rs:13:5
+ |
+LL | unreachable!("x is {x} and y is {y}", y = 0);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: did you intend to capture a variable `x` from the surrounding scope?
+ = note: to avoid ambiguity, `format_args!` cannot capture variables when the format string is expanded from a macro
+ = note: this error originates in the macro `$crate::concat` which comes from the expansion of the macro `unreachable` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to previous error
+