1 files changed, 4 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 439288e..c0286f8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -390,6 +390,10 @@ impl TypeTransform {
                 let inner = opt.convert(quote!(x));
                 quote! {#arg.map(|x| #inner)}
             }
+            TypeTransform::Iterator(inner) => {
+                let inner = inner.convert(quote!(x));
+                quote! {Box::new(#arg.map(|x| #inner))}
+            }
             TypeTransform::Result(ok, err) => {
                 let map_ok = !matches!(ok.as_ref(), TypeTransform::NoOp);
                 let map_err = !matches!(err.as_ref(), TypeTransform::NoOp);