From b3502f257ff12dbc3d094530c650efdfaf7c8f5d Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sun, 16 May 2021 14:59:08 -0400
Subject: [PATCH] Correct declare_variable example

---
 site/posts/2021-05-09-variable-declarations.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/site/posts/2021-05-09-variable-declarations.md b/site/posts/2021-05-09-variable-declarations.md
index a2865db..c90fcd4 100644
--- a/site/posts/2021-05-09-variable-declarations.md
+++ b/site/posts/2021-05-09-variable-declarations.md
@@ -72,7 +72,11 @@ impl Context {
 	}
 
 	fn declare_variable(&mut self, name: &str, value: Value) {
-		self.variables.insert(name.into(), value);
+		if self.variables.contains_key(name) {
+			panic!("cannot re-declare variable {}", name);
+		} else {
+			self.variables.insert(name.into(), value);
+		}
 	}
 }
 ```