From bd456b72e915a653993b43aacc5b42acbd0c6488 Mon Sep 17 00:00:00 2001
From: Sasha Koshka <supergriffin64@gmail.com>
Date: Wed, 17 Aug 2022 00:13:14 -0400
Subject: [PATCH] Argument.ToString can now recover on nil interface value

---
 parser/tree-tostring.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/parser/tree-tostring.go b/parser/tree-tostring.go
index 74e7753..f579550 100644
--- a/parser/tree-tostring.go
+++ b/parser/tree-tostring.go
@@ -131,6 +131,11 @@ func (phrase *Phrase) ToString (indent int, breakLine bool) (output string) {
 
 func (argument *Argument) ToString (indent int, breakLine bool) (output string) {
 	if !breakLine { indent = 0 }
+	if argument.value == nil {
+		output += "NIL ARGUMENT"
+		if breakLine { output += "\n" }
+		return
+	}
 
 	switch argument.kind {
 	case ArgumentKindPhrase: