[debugger] Assert when async debug a generic method (#17727)

* When we try to call a method to get the async_id to do an async debug and we are trying to do this in a generic method like this:

async Task<T> ExecuteAsync_Broken<T>()
 {
            await Task.Delay(2);
            return default;
  }

We need to inflate the generic type before call the method or we will get the error:  Could not execute the method because the containing type 'System.Runtime.CompilerServices.AsyncTaskMethodBuilder1[T_REF]’, is not fully instantiated.

Fixes #17549
Fixes #17569

2 files changed, 22 insertions, 0 deletions

diff --git a/mcs/class/Mono.Debugger.Soft/Test/dtest-app.cs b/mcs/class/Mono.Debugger.Soft/Test/dtest-app.cs
index ae307971acc..be5e6c7f3c9 100644
--- a/mcs/class/Mono.Debugger.Soft/Test/dtest-app.cs
+++ b/mcs/class/Mono.Debugger.Soft/Test/dtest-app.cs
@@ -604,6 +604,7 @@ public class Tests : TestsBase, ITest2
 		if_property_stepping();
 		fixed_size_array();
 		test_new_exception_filter();
+		test_async_debug_generics();
 		return 3;
 	}
 
@@ -904,6 +905,17 @@ public class Tests : TestsBase, ITest2
 	}
 
 	[MethodImplAttribute (MethodImplOptions.NoInlining)]
+	public static void test_async_debug_generics () {
+		ExecuteAsync_Broken<object>().Wait ();
+	}
+
+	async static Task<T> ExecuteAsync_Broken<T>()
+	{
+		await Task.Delay(2);
+		return default;
+	}
+
+	[MethodImplAttribute (MethodImplOptions.NoInlining)]
 	public static void inspect_enumerator_in_generic_struct() {
 		TestEnumeratorInsideGenericStruct<String, String> generic_struct = new TestEnumeratorInsideGenericStruct<String, String>(new KeyValuePair<string, string>("0", "f1"));
 	}
diff --git a/mcs/class/Mono.Debugger.Soft/Test/dtest.cs b/mcs/class/Mono.Debugger.Soft/Test/dtest.cs
index c3893706fc5..52da50a45db 100644
--- a/mcs/class/Mono.Debugger.Soft/Test/dtest.cs
+++ b/mcs/class/Mono.Debugger.Soft/Test/dtest.cs
@@ -5152,6 +5152,16 @@ public class DebuggerTests
 		vm = null;
 	}
 	
+	[Test]
+	public void TestAsyncDebugGenerics () {
+		Event e = run_until ("test_async_debug_generics");
+		e = step_in_await ("test_async_debug_generics", e);
+		e = step_in_await ("MoveNext", e);
+		e = step_in_await ("MoveNext", e);
+		e = step_in_await ("MoveNext", e);
+		e = step_in_await ("MoveNext", e);
+	}
+	
 #endif
 } // class DebuggerTests
 } // namespace