Report custom map rule errors in the lint output.

OpenRA.Game/Map/Map.cs

@@ -215,6 +215,7 @@ namespace OpenRA
 
 		public Ruleset Rules { get; private set; }
 		public bool InvalidCustomRules { get; private set; }
+		public Exception InvalidCustomRulesException { get; private set; }
 
 		/// <summary>
 		/// The top-left of the playable area in projected world coordinates
@@ -405,6 +406,7 @@ namespace OpenRA
 			{
 				Log.Write("debug", "Failed to load rules for {0} with error {1}", Title, e);
 				InvalidCustomRules = true;
+				InvalidCustomRulesException = e;
 				Rules = Ruleset.LoadDefaultsForTileSet(modData, Tileset);
 			}
 

OpenRA.Mods.Common/Lint/CheckMapMetadata.cs

@@ -31,9 +31,6 @@ namespace OpenRA.Mods.Common.Lint
 
 			if (!map.Categories.Any())
 				emitError("Map does not define any categories.");
-
-			if (map.InvalidCustomRules)
-				emitError("Map contains invalid custom rules.");
 		}
 	}
 }

OpenRA.Mods.Common/UtilityCommands/CheckYaml.cs

@@ -87,6 +87,14 @@ namespace OpenRA.Mods.Common.UtilityCommands
 				{
 					Console.WriteLine("Testing map: {0}".F(testMap.Title));
 
+					// Lint tests can't be trusted if the map rules are bogus
+					// so report that problem then skip the tests
+					if (testMap.InvalidCustomRules)
+					{
+						EmitError(testMap.InvalidCustomRulesException.ToString());
+						continue;
+					}
+
 					// Run all rule checks on the map if it defines custom rules.
 					if (testMap.RuleDefinitions != null || testMap.VoiceDefinitions != null || testMap.WeaponDefinitions != null)
 						CheckRules(modData, testMap.Rules, testMap);