[bgen] Show more than one BE1077 error before bailing completely. (#22480)

Author: rolfbjarne

src/bgen/Generator.cs

@@ -4205,6 +4205,7 @@ string GetReturnType (AsyncMethodInfo minfo)
 		return "Task<" + ttype + ">";
 	}
 
+	HashSet<string>? reported1077;
 	string GetAsyncTaskType (AsyncMethodInfo minfo)
 	{
 		if (minfo.IsSingleArgAsync)
@@ -4216,8 +4217,16 @@ string GetAsyncTaskType (AsyncMethodInfo minfo)
 		if (attr.ResultType is not null)
 			return TypeManager.FormatType (minfo.type, attr.ResultType);
 
-		//Console.WriteLine ("{0}", minfo.MethodInfo.GetParameters ().Last ().ParameterType);
-		throw new BindingException (1077, true, minfo.mi);
+		var method = minfo.mi.ToString ();
+		if (reported1077 is null)
+			reported1077 = new HashSet<string> ();
+
+		if (!reported1077.Contains (method)) {
+			reported1077.Add (method);
+			exceptions.Add (ErrorHelper.CreateError (1077, method));
+		}
+
+		return "placeholder";
 	}
 
 	string GetInvokeParamList (ParameterInfo [] parameters, bool suffix = true, bool force = false)

tests/generator/ErrorTests.cs

@@ -234,6 +234,20 @@ public void BI1060 (Profile profile)
 			bgen.AssertWarning (1060, "The Bug42855Tests.MyFooClass protocol is decorated with [Model], but not [BaseType]. Please verify that [Model] is relevant for this protocol; if so, add [BaseType] as well, otherwise remove [Model].");
 		}
 
+		[Test]
+		[TestCase (Profile.iOS)]
+		public void BI1077 (Profile profile)
+		{
+			Configuration.IgnoreIfIgnoredPlatform (profile.AsPlatform ());
+			var bgen = new BGenTool ();
+			bgen.Profile = profile;
+			bgen.CreateTemporaryBinding (File.ReadAllText (Path.Combine (Configuration.SourceRoot, "tests", "generator", "bi1077.cs")));
+			bgen.AssertExecuteError ("build");
+			bgen.AssertError (1077, "Async method System.Void A(BI1077.ADelegate) with more than one result parameter in the callback by neither ResultTypeName or ResultType");
+			bgen.AssertError (1077, "Async method System.Void B(BI1077.BDelegate) with more than one result parameter in the callback by neither ResultTypeName or ResultType");
+			bgen.AssertErrorCount (2);
+		}
+
 		[Test]
 		[TestCase (Profile.iOS)]
 		public void BI1112_Bug37527_WrongProperty (Profile profile)

tests/generator/bi1077.cs

@@ -0,0 +1,19 @@
+using Foundation;
+
+namespace BI1077 {
+
+	delegate void ADelegate (int a, int b, int c);
+	delegate void BDelegate (int a, int b, int c);
+
+	[BaseType (typeof (NSObject))]
+	partial interface BI1059 {
+		[Export ("a:")]
+		[Async]
+		void A (ADelegate callback);
+
+		[Export ("B:")]
+		[Async]
+		void B (BDelegate callback);
+	}
+
+}