diff --git a/tests/ui/generics/issue-79605.rs b/tests/ui/generics/issue-79605.rs
new file mode 100644
index 0000000000000..6f4c31e57a374
--- /dev/null
+++ b/tests/ui/generics/issue-79605.rs
@@ -0,0 +1,6 @@
+struct X<'a, T>(&'a T);
+
+impl X<'_, _> {}
+//~^ ERROR the placeholder `_` is not allowed within types on item signatures for implementations
+
+fn main() {}
diff --git a/tests/ui/generics/issue-79605.stderr b/tests/ui/generics/issue-79605.stderr
new file mode 100644
index 0000000000000..c5584962dc9e2
--- /dev/null
+++ b/tests/ui/generics/issue-79605.stderr
@@ -0,0 +1,14 @@
+error[E0121]: the placeholder `_` is not allowed within types on item signatures for implementations
+  --> $DIR/issue-79605.rs:3:12
+   |
+LL | impl X<'_, _> {}
+   |            ^ not allowed in type signatures
+   |
+help: use type parameters instead
+   |
+LL | impl<T> X<'_, T> {}
+   |     +++       ~
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0121`.