#282 - Fix the casts in the other direction (from concrete type to type parameter).

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -550,7 +550,7 @@ namespace ICSharpCode.Decompiler.Ast
 					else
 						goto case ILCode.Castclass;
 				case ILCode.Castclass:
-					if (byteCode.Arguments[0].InferredType.IsGenericParameter)
+					if (byteCode.Arguments[0].InferredType.IsGenericParameter || ((Cecil.TypeReference)operand).IsGenericParameter)
 						return arg1.CastTo(new PrimitiveType("object")).CastTo(operandAsTypeRef);
 					else
 						return arg1.CastTo(operandAsTypeRef);

ICSharpCode.Decompiler/Tests/Generics.cs

@@ -123,6 +123,11 @@ public static class Generics
 		return (string)((object)input);
 	}
 	
+	public static T CastFromString<T>(string input)
+	{
+		return (T)((object)input);
+	}
+	
 	public static bool IsInt<T>(T input)
 	{
 		return input is int;
@@ -133,6 +138,11 @@ public static class Generics
 		return (int)((object)input);
 	}
 	
+	public static T CastFromInt<T>(int input)
+	{
+		return (T)((object)input);
+	}
+	
 	public static bool IsNullableInt<T>(T input)
 	{
 		return input is int?;
@@ -147,4 +157,9 @@ public static class Generics
 	{
 		return (int?)((object)input);
 	}
+	
+	public static T CastFromNullableInt<T>(int? input)
+	{
+		return (T)((object)input);
+	}
 }