From 77b1638d64046ec960347b9054da3111f975e807 Mon Sep 17 00:00:00 2001
From: Simon Forman <sforman@hushmail.com>
Date: Wed, 14 Sep 2022 21:09:20 -0700
Subject: [PATCH] Check for minus before converting to int.

BigInts converts "-" to 0.  This happens in the parser before you get to
the evaluator.
---
 implementations/Nim/joy.nim | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/implementations/Nim/joy.nim b/implementations/Nim/joy.nim
index 5e5ee98..16b5b91 100644
--- a/implementations/Nim/joy.nim
+++ b/implementations/Nim/joy.nim
@@ -270,6 +270,8 @@ proc text_to_expression(text: string): JoyListType =
       thing = j_true
     elif tok == "false":
       thing = j_false
+    elif tok == "-":  # see https://github.com/nim-lang/bigints/issues/116
+      thing = JoyType(kind: joySymbol, symVal: tok)
     else:
       try:
         thing = JoyType(kind: joyInt, intVal: tok.initBigInt)