From bb878f980b26f4a90a0ba7ec18e6a044a04e7d14 Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Tue, 3 Aug 2021 21:00:28 +0900
Subject: Fix the name of the EOF symbol in the description file

---
 grammar/slr.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/grammar/slr.go b/grammar/slr.go
index 2f4c786..1bca78f 100644
--- a/grammar/slr.go
+++ b/grammar/slr.go
@@ -412,6 +412,13 @@ func (b *slrTableBuilder) productionToString(prod *production, dot int) string {
 }
 
 func (b *slrTableBuilder) symbolToText(sym symbol) string {
+	if sym.isNil() {
+		return "<NULL>"
+	}
+	if sym.isEOF() {
+		return "<EOF>"
+	}
+
 	text, ok := b.symTab.toText(sym)
 	if !ok {
 		return fmt.Sprintf("<symbol not found: %v>", sym)
-- 
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