2 files changed, 36 insertions, 0 deletions
diff --git a/tests/ui/implied-bounds/issue-110161.rs b/tests/ui/implied-bounds/issue-110161.rs
new file mode 100644
index 00000000000..ca75026ffe8
--- /dev/null
+++ b/tests/ui/implied-bounds/issue-110161.rs
@@ -0,0 +1,24 @@
+// ICE regression relating to unconstrained lifetimes in implied
+// bounds. See #110161.
+
+// compile-flags: --crate-type=lib
+
+trait Trait {
+    type Ty;
+}
+
+// erroneous `Ty` impl
+impl Trait for () {
+//~^ ERROR not all trait items implemented, missing: `Ty` [E0046]
+}
+
+// `'lt` is not constrained by the erroneous `Ty`
+impl<'lt, T> Trait for Box<T>
+where
+    T: Trait<Ty = &'lt ()>,
+{
+    type Ty = &'lt ();
+}
+
+// unconstrained lifetime appears in implied bounds
+fn test(_: <Box<()> as Trait>::Ty) {}
diff --git a/tests/ui/implied-bounds/issue-110161.stderr b/tests/ui/implied-bounds/issue-110161.stderr
new file mode 100644
index 00000000000..c76b4737626
--- /dev/null
+++ b/tests/ui/implied-bounds/issue-110161.stderr
@@ -0,0 +1,12 @@
+error[E0046]: not all trait items implemented, missing: `Ty`
+  --> $DIR/issue-110161.rs:11:1
+   |
+LL |     type Ty;
+   |     ------- `Ty` from trait
+...
+LL | impl Trait for () {
+   | ^^^^^^^^^^^^^^^^^ missing `Ty` in implementation
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0046`.