Store an Option in OptionalLit instead of a vec

Closes #21

1 files changed, 2 insertions, 2 deletions

diff --git a/dhall_core/src/parser.rs b/dhall_core/src/parser.rs
index 02242bf..9cbd878 100644
--- a/dhall_core/src/parser.rs
+++ b/dhall_core/src/parser.rs
@@ -648,7 +648,7 @@ rule!(merge_expression<BoxExpr>;
 rule!(empty_collection<BoxExpr>;
     children!(x: str, y: expression) => {
        match x {
-          "Optional" => bx(Expr::OptionalLit(Some(y), vec![])),
+          "Optional" => bx(Expr::OptionalLit(Some(y), None)),
           "List" => bx(Expr::ListLit(Some(y), vec![])),
           _ => unreachable!(),
        }
@@ -657,7 +657,7 @@ rule!(empty_collection<BoxExpr>;
 
 rule!(non_empty_optional<BoxExpr>;
     children!(x: expression, _y: str, z: expression) => {
-        bx(Expr::OptionalLit(Some(z), vec![*x]))
+        bx(Expr::OptionalLit(Some(z), Some(x)))
     }
 );