public Diagnostic(Location location, IEnumerable <Location> additionalLocations, DiagnosticDescriptor descriptor, params object[] messageArgs)
{
Location = location ?? throw new ArgumentNullException(nameof(location));
Descriptor = descriptor ?? throw new ArgumentNullException(nameof(descriptor));
AdditionalLocations = additionalLocations?.Where(loc => loc != null).ToImmutableArray() ?? EmptyAdditionalLocations;
_messageArgs = messageArgs ?? EmptyMessageArgs;
}
public Diagnostic(Location location, Location additionalLocation, DiagnosticDescriptor descriptor, params object[] messageArgs)
: this(location, new[] { additionalLocation }, descriptor, messageArgs)
{
}