diff --git a/crates/hir-ty/src/tests/diagnostics.rs b/crates/hir-ty/src/tests/diagnostics.rs
index 80f92eaf435..fde90b0a55f 100644
--- a/crates/hir-ty/src/tests/diagnostics.rs
+++ b/crates/hir-ty/src/tests/diagnostics.rs
@@ -136,3 +136,20 @@ impl Trait for () {
 "#,
     );
 }
+
+#[test]
+fn no_mismatches_with_unresolved_projections() {
+    check_no_mismatches(
+        r#"
+// Thing is {unknown}
+fn create() -> Option<(i32, Thing)> {
+    Some((69420, Thing))
+}
+
+fn consume() -> Option<()> {
+    let (number, thing) = create()?;
+    Some(())
+}
+"#,
+    );
+}
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 1d4d458e89e..b9f7ff67a00 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -73,7 +73,8 @@ use hir_ty::{
     traits::FnTrait,
     AliasTy, CallableDefId, CallableSig, Canonical, CanonicalVarKinds, Cast, ClosureId, GenericArg,
     GenericArgData, Interner, ParamKind, QuantifiedWhereClause, Scalar, Substitution,
-    TraitEnvironment, TraitRefExt, Ty, TyBuilder, TyDefId, TyExt, TyKind, ValueTyDefId, WhereClause,
+    TraitEnvironment, TraitRefExt, Ty, TyBuilder, TyDefId, TyExt, TyKind, ValueTyDefId,
+    WhereClause,
 };
 use itertools::Itertools;
 use nameres::diagnostics::DefDiagnosticKind;