Code inspection: Use compiler-supported nullable attributes

This inspection reports JetBrains nullability annotations that can be replaced with compiler-supported attributes from System.Diagnostics.CodeAnalysis. This is useful in nullable-enabled code, where the compiler-native attributes express the same contract more directly.

Example

                using JetBrains.Annotations;
                class C<T>
                {
                    [NotNull]
                    public T M() => throw null!;
                }
            

                using JetBrains.Annotations;
                class C<T>
                {
                    [return: System.Diagnostics.CodeAnalysis.NotNull]
                    public T M() => throw null!;
                }
            

Quick-fix

Replace the JetBrains nullability annotation with the compiler-supported nullable attribute.

29 March 2026