more diag updates

Author: parisba

YarnSpinner.Compiler/DiagnosticDescriptor.cs

@@ -619,16 +619,16 @@ public string FormatMessage(params object[] args)
         );
 
         /// <summary>
-        /// YS0036: Preview feature not enabled.
+        /// YS0036: Language version too low for feature.
         /// </summary>
         /// <remarks>
         /// <para>Format placeholders: 0: error message.</para>
         /// </remarks>
-        public static readonly DiagnosticDescriptor PreviewFeatureRequired = new DiagnosticDescriptor(
+        public static readonly DiagnosticDescriptor LanguageVersionTooLow = new DiagnosticDescriptor(
             code: "YS0036",
             messageTemplate: "{0}",
             defaultSeverity: Diagnostic.DiagnosticSeverity.Error,
-            description: "A preview language feature was used but preview features are not enabled."
+            description: "A language feature was used that requires a newer Yarn Spinner project version."
         );
 
         /// <summary>
@@ -702,7 +702,7 @@ public string FormatMessage(params object[] args)
             { EmptyNode.Code, EmptyNode },
             { InvalidLibraryFunction.Code, InvalidLibraryFunction },
             { EnumDeclarationError.Code, EnumDeclarationError },
-            { PreviewFeatureRequired.Code, PreviewFeatureRequired },
+            { LanguageVersionTooLow.Code, LanguageVersionTooLow },
             { InvalidLiteralValue.Code, InvalidLiteralValue },
             { InvalidMemberAccess.Code, InvalidMemberAccess },
         };

YarnSpinner.Compiler/Visitors/PreviewFeatureVisitor.cs

@@ -16,12 +16,12 @@ internal PreviewFeatureVisitor(FileParseResult file, int languageVersion, IList<
 
         private void AddLanguageFeatureError(ParserRuleContext context, string featureType)
         {
-            AddError(context, $"Language feature \"{featureType}\" is only available when preview features are enabled");
+            AddError(context, $"Language feature \"{featureType}\" is not available at language version {LanguageVersion}; it requires version {Project.YarnSpinnerProjectVersion3} or later");
         }
 
         private void AddError(ParserRuleContext context, string message)
         {
-            var d = DiagnosticDescriptor.PreviewFeatureRequired.Create(File.Name, context, message);
+            var d = DiagnosticDescriptor.LanguageVersionTooLow.Create(File.Name, context, message);
             this.Diagnostics.Add(d);
         }