From 6b94054c71a0f371d83e97cee0200c29e685c5c2 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jans.tuomi@gmail.com>
Date: Fri, 3 Nov 2023 13:39:19 +0200
Subject: Work on TPU

---
 src/asm_pass3.py | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/asm_pass3.py')

diff --git a/src/asm_pass3.py b/src/asm_pass3.py
index edfd79f..7fcb44d 100644
--- a/src/asm_pass3.py
+++ b/src/asm_pass3.py
@@ -30,6 +30,9 @@ def pass_3(result2: Result2) -> Result3:
         address = eval_expr(symbols, args[0])
         continue
       case "@label":
+        label = args[0]
+        if label in symbols:
+          raise Exception(f"When defining label {label} as {address:>04x}, symbol {label} already defined as {symbols[label]:>04x}")
         symbols[args[0]] = address
         continue
       case "@let":
-- 
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