From 3631ca69c55052c9308e8a583c761087bcb409d9 Mon Sep 17 00:00:00 2001
From: Xavier Wang <xavierxwang@tencent.com>
Date: Wed, 6 Dec 2023 19:29:09 +0800
Subject: [PATCH] use "_field" as proto3 optional oneof name compatible with
 proto3 for #257

---
 protoc.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/protoc.lua b/protoc.lua
index 104a64d..55fd067 100644
--- a/protoc.lua
+++ b/protoc.lua
@@ -488,7 +488,7 @@ local function label_field(self, lex, ident, parent)
    if proto3_optional then
       local ot = default(parent, "oneof_decl")
       info.oneof_index = #ot
-      ot[#ot+1] = { name = "optional_" .. info.name }
+      ot[#ot+1] = { name = "_" .. info.name }
    else
       info.label = label
    end