Compiler error for AutoNetworkedField fields in a component without a AutoGenerateComponentState attribute (#4670)

* yeah

* remove autonetfield

---------

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Robust.Shared.CompNetworkGenerator/ComponentNetworkGenerator.cs

@@ -315,6 +315,8 @@ public partial class {componentName}
         {
             var symbols = new List<(INamedTypeSymbol, AttributeData)>();
             var attributeSymbol = comp.GetTypeByMetadataName(ClassAttributeName);
+            var fieldAttr = comp.GetTypeByMetadataName(MemberAttributeName);
+
             foreach (var candidateClass in receiver.CandidateClasses)
             {
                 var model = comp.GetSemanticModel(candidateClass.SyntaxTree);
@@ -325,6 +327,31 @@ public partial class {componentName}
 
                 if (relevantAttribute == null)
                 {
+                    if (typeSymbol == null)
+                        continue;
+
+                    foreach (var mem in typeSymbol.GetMembers())
+                    {
+                        var attribute = mem.GetAttributes().FirstOrDefault(a =>
+                            a.AttributeClass != null &&
+                            a.AttributeClass.Equals(fieldAttr, SymbolEqualityComparer.Default));
+
+                        if (attribute == null)
+                            continue;
+
+                        var msg = "Field is marked with [AutoNetworkedField], but its class has no [AutoGenerateComponentState] attribute.";
+                        context.ReportDiagnostic(
+                            Diagnostic.Create(
+                                new DiagnosticDescriptor(
+                                    "RXN0007",
+                                    msg,
+                                    msg,
+                                    "Usage",
+                                    DiagnosticSeverity.Error,
+                                    true),
+                                candidateClass.Keyword.GetLocation()));
+                    }
+
                     continue;
                 }
 

Robust.Shared/GameObjects/Components/Light/SharedPointLightComponent.cs

@@ -13,7 +13,7 @@ namespace Robust.Shared.GameObjects
     public abstract partial class SharedPointLightComponent : Component
     {
         [ViewVariables(VVAccess.ReadWrite)]
-        [DataField("color"), AutoNetworkedField]
+        [DataField("color")]
         [Animatable]
         public Color Color { get; set; } = Color.White;
 
@@ -26,17 +26,17 @@ namespace Robust.Shared.GameObjects
         public Vector2 Offset = Vector2.Zero;
 
         [ViewVariables(VVAccess.ReadWrite)]
-        [DataField("energy"), AutoNetworkedField]
+        [DataField("energy")]
         [Animatable]
         public float Energy { get; set; } = 1f;
 
-        [DataField("softness"), AutoNetworkedField, Animatable]
+        [DataField("softness"), Animatable]
         public float Softness { get; set; } = 1f;
 
         /// <summary>
         ///     Whether this pointlight should cast shadows
         /// </summary>
-        [DataField("castShadows"), AutoNetworkedField]
+        [DataField("castShadows")]
         public bool CastShadows = true;
 
         [Access(typeof(SharedPointLightSystem))]