Process completed with exit code 1.

Nullability of reference types in type of parameter 'x' of 'bool SchemeNameComparerIgnoreCase.Equals(string x, string y)' doesn't match implicitly implemented member 'bool IEqualityComparer<string>.Equals(string? x, string? y)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'y' of 'bool SchemeNameComparerIgnoreCase.Equals(string x, string y)' doesn't match implicitly implemented member 'bool IEqualityComparer<string>.Equals(string? x, string? y)' (possibly because of nullability attributes).

Possible null reference argument for parameter 'left' in 'bool ColorScheme.operator ==(ColorScheme left, ColorScheme right)'.

Possible null reference argument for parameter 'right' in 'bool ColorScheme.operator ==(ColorScheme left, ColorScheme right)'.

Cannot convert null literal to non-nullable reference type.

Possible null reference argument for parameter 'left' in 'bool ColorScheme.operator !=(ColorScheme left, ColorScheme right)'.

Cannot convert null literal to non-nullable reference type.

Possible null reference argument for parameter 'left' in 'bool ColorScheme.operator !=(ColorScheme left, ColorScheme right)'.

Cannot convert null literal to non-nullable reference type.