1 files changed, 8 insertions, 0 deletions
diff --git a/src/grammar_util.rs b/src/grammar_util.rs
new file mode 100644
index 0000000..cbd1e59
--- /dev/null
+++ b/src/grammar_util.rs
@@ -0,0 +1,8 @@
+use core::Expr;
+
+pub type BoxExpr = Box<Expr<(), ()>>;
+pub type ExprOpFn = fn(BoxExpr, BoxExpr) -> Expr<(), ()>;
+
+pub fn bx<T>(x: T) -> Box<T> {
+    Box::new(x)
+}