From adb12c2c1b2873d8775f55c02f54e6690687f1a2 Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Wed, 28 Jul 2021 01:54:39 +0900
Subject: Detect duplicate production errors

---
 grammar/production.go | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

(limited to 'grammar/production.go')

diff --git a/grammar/production.go b/grammar/production.go
index a935037..d4ea7a1 100644
--- a/grammar/production.go
+++ b/grammar/production.go
@@ -80,9 +80,9 @@ func newProductionSet() *productionSet {
 	}
 }
 
-func (ps *productionSet) append(prod *production) bool {
+func (ps *productionSet) append(prod *production) {
 	if _, ok := ps.id2Prod[prod.id]; ok {
-		return false
+		return
 	}
 
 	if prod.lhs.isStart() {
@@ -98,8 +98,6 @@ func (ps *productionSet) append(prod *production) bool {
 		ps.lhs2Prods[prod.lhs] = []*production{prod}
 	}
 	ps.id2Prod[prod.id] = prod
-
-	return true
 }
 
 func (ps *productionSet) findByID(id productionID) (*production, bool) {
-- 
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