[mcs] New property/indexer cannot have accessors implementing an interface in base type. Fixes #56627

2 files changed, 80 insertions, 0 deletions

diff --git a/mcs/errors/cs0535-7.cs b/mcs/errors/cs0535-7.cs
new file mode 100644
index 00000000000..11a7670bc1b
--- /dev/null
+++ b/mcs/errors/cs0535-7.cs
@@ -0,0 +1,40 @@
+// CS0535: `CC' does not implement interface member `IA.Coordinate.set'
+// Line: 33
+
+using System;
+
+public interface IA
+{
+	object Coordinate {
+		get;
+		set;
+	}
+}
+
+public abstract class CA : IA
+{
+	public abstract object Coordinate {
+		get;
+		set;
+	}
+}
+
+public  partial class CB : CA
+{
+	public override object Coordinate {
+		get {
+			throw new NotImplementedException ();
+		}
+		set {
+		}
+	}
+}
+
+public class CC : CB, IA
+{
+	public new object Coordinate {
+		get {
+			throw new NotImplementedException ();
+		}
+	}
+}
diff --git a/mcs/errors/cs0535-8.cs b/mcs/errors/cs0535-8.cs
new file mode 100644
index 00000000000..853794ee31d
--- /dev/null
+++ b/mcs/errors/cs0535-8.cs
@@ -0,0 +1,40 @@
+// CS0535: `CC' does not implement interface member `IA.this[int].set'
+// Line: 33
+
+using System;
+
+public interface IA
+{
+	object this[int arg] {
+		get;
+		set;
+	}
+}
+
+public abstract class CA : IA
+{
+	public abstract object this[int arg] {
+		get;
+		set;
+	}
+}
+
+public  partial class CB : CA
+{
+	public override object this[int arg] {
+		get {
+			throw new NotImplementedException ();
+		}
+		set {
+		}
+	}
+}
+
+public class CC : CB, IA
+{
+	public new object this[int arg] {
+		get {
+			throw new NotImplementedException ();
+		}
+	}
+}