public static DiagnosticInfo ReportNullableReferenceTypesIfNeeded(CSharpCompilation compilation, bool isNullableEnabled)
{
var featureID = MessageID.IDS_FeatureNullableReferenceTypes;
if (!compilation.IsFeatureEnabled(featureID))
{
LanguageVersion availableVersion = compilation.LanguageVersion;
LanguageVersion requiredVersion = featureID.RequiredVersion();
return(new CSDiagnosticInfo(availableVersion.GetErrorCode(), featureID.Localize(), new CSharpRequiredLanguageVersion(requiredVersion)));
}
else if (!isNullableEnabled)
{
return(new CSDiagnosticInfo(ErrorCode.WRN_MissingNonNullTypesContextForAnnotation));
}
return(null);
}
