Code inspection: Type check for nullable type is equal to underlying type check

This inspection reports a nullable type mark in an is type test when the ? does not change the result of the pattern. Removing it makes the check clearer.

Example

                void Check<TStruct>(object obj) where TStruct : struct
                {
                    if (obj is TStruct?)
                    {
                        Use();
                    }
                }
            

                void Check<TStruct>(object obj) where TStruct : struct
                {
                    if (obj is TStruct)
                    {
                        Use();
                    }
                }
            

Quick-fix

The quick-fix removes the redundant ? from the type test.

13 April 2026