Store a vec in App

Closes #26

1 files changed, 6 insertions, 1 deletions

diff --git a/dhall_core/src/parser.rs b/dhall_core/src/parser.rs
index ddf3f8f..02242bf 100644
--- a/dhall_core/src/parser.rs
+++ b/dhall_core/src/parser.rs
@@ -746,7 +746,12 @@ rule!(annotated_expression<BoxExpr>;
 
 rule!(application_expression<BoxExpr>;
     children!(first: expression, rest*: expression) => {
-        rest.fold(first, |acc, e| bx(Expr::App(acc, e)))
+        let rest: Vec<_> = rest.map(|x| *x).collect();
+        if rest.is_empty() {
+            first
+        } else {
+            bx(Expr::App(first, rest))
+        }
     }
 );