From 8642f4847cf4ff252b9a6566cf8ca8add465a5c5 Mon Sep 17 00:00:00 2001
From: modmuss50 <modmuss50@gmail.com>
Date: Sat, 20 May 2023 21:23:44 +0100
Subject: [PATCH] Skip synthetic classes

---
 src/main/java/net/fabricmc/mappingpoet/Main.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/net/fabricmc/mappingpoet/Main.java b/src/main/java/net/fabricmc/mappingpoet/Main.java
index 83c614b..96ae496 100644
--- a/src/main/java/net/fabricmc/mappingpoet/Main.java
+++ b/src/main/java/net/fabricmc/mappingpoet/Main.java
@@ -231,6 +231,11 @@ private static boolean isDigit(char ch) {
 	}
 
 	private static void writeClass(MappingsStore mappings, ClassNode classNode, Map<String, ClassBuilder> existingClasses, Environment environment) {
+		if ((classNode.access & Opcodes.ACC_SYNTHETIC) != 0) {
+			// Skip synthetic classes such as package-info
+			return;
+		}
+
 		// TODO make sure named jar has valid InnerClasses, use that info instead
 		String name = classNode.name;
 		{