From 7766a8ae3048e5147bfbbe1195c05cc63aecf86e Mon Sep 17 00:00:00 2001
From: Emi Simpson <emi@alchemi.dev>
Date: Mon, 25 Apr 2022 10:10:37 -0400
Subject: [PATCH] Try to get a little boost using tail call recursion

---
 src/ir/expr.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/ir/expr.rs b/src/ir/expr.rs
index 8a9f531..bab0d9e 100644
--- a/src/ir/expr.rs
+++ b/src/ir/expr.rs
@@ -251,12 +251,16 @@ pub fn get_last_ident(exprs: &LinkedList<Expr>) -> Option<Identifier> {
 }
 
 pub fn evaluate(exprs: LinkedList<Expr>, bindings: &ValueBindings) -> evaluation::Result {
-	let bindings = bindings.nested_scope();
 	if exprs.iter().all(|e| !e.isnt_noop()) {
 		bindings.lookup(&exprs.back().ok_or(EvaluateError::EvaluatingZeroLengthExpr)?.identifier)
 			.ok_or_else(|| EvaluateError::UndefinedValue(exprs.back().unwrap().identifier.clone()))
 			.cloned()
+	} else if exprs.len() == 1 {
+		exprs.back()
+			.unwrap()
+			.evaluate(&bindings)
 	} else {
+		let bindings = bindings.nested_scope();
 		let (all_bindings, last_ident) = exprs.into_iter()
 			.filter(Expr::isnt_noop)
 			.try_fold(