private static ImmutableHashSet <INamedTypeSymbol> GetWellKnownCollectionTypes(Compilation compilation)
{
var builder = ImmutableHashSet.CreateBuilder <INamedTypeSymbol>();
var iCollection = WellKnownTypes.ICollection(compilation);
if (iCollection != null)
{
builder.Add(iCollection);
}
var genericICollection = WellKnownTypes.GenericICollection(compilation);
if (genericICollection != null)
{
builder.Add(genericICollection);
}
var genericIReadOnlyCollection = WellKnownTypes.GenericIReadOnlyCollection(compilation);
if (genericIReadOnlyCollection != null)
{
builder.Add(genericIReadOnlyCollection);
}
return(builder.ToImmutable());
}
