private static ImmutableHashSet <INamedTypeSymbol> GetSpecialAttributes(Compilation compilation)
{
var specialAttributes = PooledHashSet <INamedTypeSymbol> .GetInstance();
var fieldOffsetAttribute = WellKnownTypes.FieldOffsetAttribute(compilation);
if (fieldOffsetAttribute != null)
{
specialAttributes.Add(fieldOffsetAttribute);
}
var mefV1Attribute = WellKnownTypes.MEFV1ExportAttribute(compilation);
if (mefV1Attribute != null)
{
specialAttributes.Add(mefV1Attribute);
}
var mefV2Attribute = WellKnownTypes.MEFV2ExportAttribute(compilation);
if (mefV2Attribute != null)
{
specialAttributes.Add(mefV2Attribute);
}
return(specialAttributes.ToImmutableAndFree());
}
