From 63aa21c581933a10b2b1ab96c632c72834cf2115 Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Mon, 15 Apr 2019 12:22:02 +0200
Subject: Handle empty optionals correctly

Closes #78
---
 dhall_core/src/visitor.rs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'dhall_core/src/visitor.rs')

diff --git a/dhall_core/src/visitor.rs b/dhall_core/src/visitor.rs
index b0424ac..3b06f8b 100644
--- a/dhall_core/src/visitor.rs
+++ b/dhall_core/src/visitor.rs
@@ -148,6 +148,10 @@ where
             ),
             EmptyListLit(t) => EmptyListLit(v.visit_subexpr(t)?),
             NEListLit(es) => NEListLit(vec(es, |e| v.visit_subexpr(e))?),
+            OldOptionalLit(x, t) => OldOptionalLit(
+                opt(x, |e| v.visit_subexpr(e))?,
+                v.visit_subexpr(t)?,
+            ),
             EmptyOptionalLit(t) => EmptyOptionalLit(v.visit_subexpr(t)?),
             NEOptionalLit(e) => NEOptionalLit(v.visit_subexpr(e)?),
             RecordType(kts) => RecordType(btmap(kts, v)?),
-- 
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