Code inspection: Redundant discard designation

This inspection reports a discard designation in a type or recursive pattern when the pattern does not need any designation at all. The _ does not capture anything and adds no value to the match.

Example

                class C
                {
                    void M(object value)
                    {
                        if (value is string _)
                        {
                        }
                    }
                }
            

                class C
                {
                    void M(object value)
                    {
                        if (value is string)
                        {
                        }
                    }
                }
            

Quick-fix

Remove the redundant discard designation from the pattern.

13 April 2026