Make some annotations optional in AST

1 files changed, 1 insertions, 1 deletions

diff --git a/dhall/src/grammar_util.rs b/dhall/src/grammar_util.rs
index 2250acd..c185632 100644
--- a/dhall/src/grammar_util.rs
+++ b/dhall/src/grammar_util.rs
@@ -3,5 +3,5 @@ use crate::core::{Expr, X};
 pub type ParsedExpr<'i> = Expr<'i, X, X>; // FIXME Parse paths and replace the second X with Path
 pub type BoxExpr<'i> = Box<ParsedExpr<'i>>;
 pub type ExprOpFn<'i> = fn(BoxExpr<'i>, BoxExpr<'i>) -> ParsedExpr<'i>;
-pub type ExprListFn<'i> = fn(BoxExpr<'i>, Vec<ParsedExpr<'i>>) -> ParsedExpr<'i>;
+pub type ExprListFn<'i> = fn(Option<BoxExpr<'i>>, Vec<ParsedExpr<'i>>) -> ParsedExpr<'i>;