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diff --git a/src/test/ui/const-generics/issues/issue-68366.full.stderr b/src/test/ui/const-generics/issues/issue-68366.full.stderr
new file mode 100644
index 000000000..ca9eb801d
--- /dev/null
+++ b/src/test/ui/const-generics/issues/issue-68366.full.stderr
@@ -0,0 +1,21 @@
+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 2 previous errors
+
+For more information about this error, try `rustc --explain E0207`.