Implement traverse_ref for ValueKind

2 files changed, 3 insertions, 2 deletions

diff --git a/dhall/src/syntax/ast/expr.rs b/dhall/src/syntax/ast/expr.rs
index 68cb524..376480f 100644
--- a/dhall/src/syntax/ast/expr.rs
+++ b/dhall/src/syntax/ast/expr.rs
@@ -189,7 +189,7 @@ impl<SE, E> ExprKind<SE, E> {
         .visit(self)
     }
 
-    fn traverse_ref<'a, SE2, Err>(
+    pub(crate) fn traverse_ref<'a, SE2, Err>(
         &'a self,
         visit_subexpr: impl FnMut(&'a SE) -> Result<SE2, Err>,
     ) -> Result<ExprKind<SE2, E>, Err>
diff --git a/dhall/src/syntax/ast/visitor.rs b/dhall/src/syntax/ast/visitor.rs
index 424048b..f9fd379 100644
--- a/dhall/src/syntax/ast/visitor.rs
+++ b/dhall/src/syntax/ast/visitor.rs
@@ -1,6 +1,7 @@
-use crate::syntax::*;
 use std::iter::FromIterator;
 
+use crate::syntax::*;
+
 /// A visitor trait that can be used to traverse `ExprKind`s. We need this pattern so that Rust lets
 /// us have as much mutability as we can.
 /// For example, `traverse_ref_with_special_handling_of_binders` cannot be made using only