1 files changed, 19 insertions, 0 deletions
diff --git a/dhall_core/src/core.rs b/dhall_core/src/core.rs
index db83a1e..3d1b9f3 100644
--- a/dhall_core/src/core.rs
+++ b/dhall_core/src/core.rs
@@ -598,6 +598,25 @@ pub fn rc<N, E>(x: Expr<N, E>) -> SubExpr<N, E> {
     SubExpr(Rc::new(x))
 }
 
+pub fn app<N, E>(f: Expr<N, E>, args: Vec<SubExpr<N, E>>) -> Expr<N, E> {
+    if args.is_empty() {
+        f
+    } else {
+        ExprF::App(rc(f), args)
+    }
+}
+
+pub fn app_rc<N, E>(
+    f: SubExpr<N, E>,
+    args: Vec<SubExpr<N, E>>,
+) -> SubExpr<N, E> {
+    if args.is_empty() {
+        f
+    } else {
+        rc(ExprF::App(f, args))
+    }
+}
+
 fn add_ui(u: usize, i: isize) -> usize {
     if i < 0 {
         u.checked_sub(i.checked_neg().unwrap() as usize).unwrap()