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diff --git a/tests/ui/const-generics/issues/issue-68366.min.stderr b/tests/ui/const-generics/issues/issue-68366.min.stderr
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+++ b/tests/ui/const-generics/issues/issue-68366.min.stderr
@@ -0,0 +1,30 @@
+error: generic parameters may not be used in const operations
+  --> $DIR/issue-68366.rs:11:37
+   |
+LL | impl <const N: usize> Collatz<{Some(N)}> {}
+   |                                     ^ cannot perform const operation using `N`
+   |
+   = help: const parameters may only be used as standalone arguments, i.e. `N`
+   = help: use `#![feature(generic_const_exprs)]` to allow generic const expressions
+
+error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/issue-68366.rs:11:7
+   |
+LL | impl <const N: usize> Collatz<{Some(N)}> {}
+   |       ^^^^^^^^^^^^^^ unconstrained const parameter
+   |
+   = note: expressions using a const parameter must map each value to a distinct output value
+   = note: proving the result of expressions other than the parameter are unique is not supported
+
+error[E0207]: the const parameter `N` is not constrained by the impl trait, self type, or predicates
+  --> $DIR/issue-68366.rs:17:6
+   |
+LL | impl<const N: usize> Foo {}
+   |      ^^^^^^^^^^^^^^ unconstrained const parameter
+   |
+   = note: expressions using a const parameter must map each value to a distinct output value
+   = note: proving the result of expressions other than the parameter are unique is not supported
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0207`.