From c279f9111e3283cc9968ab2ebc7adf332bcba3e4 Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Mon, 10 Apr 2023 22:05:22 +0200
Subject: [PATCH] Eval: Only need to cast AST once

---
 src/eval.cpp | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/eval.cpp b/src/eval.cpp
index 0131f89..c8df127 100644
--- a/src/eval.cpp
+++ b/src/eval.cpp
@@ -62,20 +62,17 @@ ValuePtr Eval::evalImpl()
 			return evalAst(ast, env);
 		}
 
-		auto list = std::static_pointer_cast<List>(ast);
-
-		if (list->empty()) {
-			return ast;
-		}
-
 		ast = macroExpand(ast, env);
 
 		if (!is<List>(ast.get())) {
 			return evalAst(ast, env);
 		}
 
-		// Macro-expand modifies `ast', so get the new list
-		list = std::static_pointer_cast<List>(ast);
+		auto list = std::static_pointer_cast<List>(ast);
+
+		if (list->empty()) {
+			return ast;
+		}
 
 		// Special forms
 		auto nodes = list->nodes();