From 9a71e6a806563e5ee9aa7eef0c5c9fdc58a9c1c9 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jans.tuomi@gmail.com>
Date: Thu, 25 Nov 2021 13:35:31 +0200
Subject: Throw error if trying to redefine symbol

---
 src/runtime.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/runtime.rs b/src/runtime.rs
index 18e8e2e..71947fe 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -368,6 +368,9 @@ pub fn process(
                 parameters,
                 expression,
             } => {
+                if symbol_table.contains_key(symbol) {
+                    return Err(format!("[runtime] symbol already defined: {}", symbol));
+                }
                 let bound_params: Vec<(ast::Symbol, usize)> = parameters
                     .iter()
                     .map(|param| (param.clone(), advance_v()))
-- 
cgit v1.3