From 1f1cc9f8c5ad9bcf2b0b3eadac5a85bc2cdbd0a3 Mon Sep 17 00:00:00 2001
From: Eytan Heidingsfeld <32422402+ehmm@users.noreply.github.com>
Date: Mon, 1 Apr 2024 07:20:57 +0000
Subject: [PATCH] golang: Add to quick checks to PredictionContext Equals
 checks (they are in use in other runtimes):

1. If pointers are equal it's the same object
2. If we are comparing singletons both types must be singletons

Signed-off-by: Eytan Heidingsfeld <32422402+ehmm@users.noreply.github.com>
---
 runtime/Go/antlr/v4/prediction_context.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/runtime/Go/antlr/v4/prediction_context.go b/runtime/Go/antlr/v4/prediction_context.go
index 7014ac07a9..cd89bd3417 100644
--- a/runtime/Go/antlr/v4/prediction_context.go
+++ b/runtime/Go/antlr/v4/prediction_context.go
@@ -115,6 +115,9 @@ func (p *PredictionContext) Hash() int {
 }
 
 func (p *PredictionContext) Equals(other Collectable[*PredictionContext]) bool {
+	if p == other {
+		return true
+	}
 	switch p.pcType {
 	case PredictionContextEmpty:
 		otherP := other.(*PredictionContext)
@@ -152,7 +155,7 @@ func (p *PredictionContext) SingletonEquals(other Collectable[*PredictionContext
 		return false
 	}
 	otherP := other.(*PredictionContext)
-	if otherP == nil {
+	if otherP == nil || otherP.pcType != PredictionContextSingleton {
 		return false
 	}