PaperMC/paper-server/patches/sources/net/minecraft/commands/CommandSource.java.patch

--- a/net/minecraft/commands/CommandSource.java
+++ b/net/minecraft/commands/CommandSource.java
@@ -22,6 +22,13 @@
         public boolean shouldInformAdmins() {
             return false;
         }
+
+        // CraftBukkit start
+        @Override
+        public org.bukkit.command.CommandSender getBukkitSender(CommandSourceStack wrapper) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+        // CraftBukkit end
     };
 
     void sendSystemMessage(Component message);
@@ -35,4 +42,6 @@
     default boolean alwaysAccepts() {
         return false;
     }
+
+    org.bukkit.command.CommandSender getBukkitSender(CommandSourceStack wrapper); // CraftBukkit
 }