Imported Upstream version 3.8.0

Former-commit-id: 6a76a29bd07d86e57c6c8da45c65ed5447d38a61

mcs/errors/cs0579-9.cs

@@ -0,0 +1,22 @@
+// CS0579: The attribute `TestAttributesCollecting.A' cannot be applied multiple times
+// Line: 19
+
+using System;
+
+namespace TestAttributesCollecting
+{
+	class A : Attribute
+	{
+		public A (int a)
+		{
+		}
+	}
+
+	partial class G1<[A (1)]T>
+	{
+	}
+
+	partial class G1<[A (2)]T>
+	{
+	}
+}