[mcs] Fix null coalescing operator on cast of source expression resolved to implicit user operator conversion. Fixes #36161

1 files changed, 20 insertions, 0 deletions

diff --git a/mcs/tests/test-931.cs b/mcs/tests/test-931.cs
new file mode 100644
index 00000000000..7a1f7be472d
--- /dev/null
+++ b/mcs/tests/test-931.cs
@@ -0,0 +1,20 @@
+using System;
+
+class MainClass
+{
+	public static implicit operator string (MainClass src)
+	{
+		return null;
+	}
+
+	public static int Main ()
+	{
+		var obj = new MainClass ();
+		var s = "x";
+		var res = (string) obj ?? s;
+		if (res != "x")
+			return 1;
+
+		return 0;
+	}
+}