private static ImmutableArray<TypeSymbol> GetTypeArguments(ImmutableArray<TypeParameterSymbol> definitionTypeParameters, AbstractTypeParameterMap currentTypeMap, AbstractTypeParameterMap typeSubstitutionOpt)
{
var typeArguments = ImmutableArray.CreateBuilder<TypeSymbol>(definitionTypeParameters.Length);
foreach (var typeParameterSymbol in definitionTypeParameters)
{
if (typeSubstitutionOpt != null)
{
var substitutedType = currentTypeMap.SubstituteType(typeParameterSymbol);
if (!object.ReferenceEquals(substitutedType, typeParameterSymbol))
{
typeArguments.Add(currentTypeMap.SubstituteType(substitutedType));
}
else
{
var substitutedTypeOpt = typeSubstitutionOpt.SubstituteType(typeParameterSymbol.OriginalDefinition);
typeArguments.Add(currentTypeMap.SubstituteType(substitutedTypeOpt));
}
}
else
{
typeArguments.Add(currentTypeMap.SubstituteType(typeParameterSymbol));
}
}
return typeArguments.ToImmutableArray();
}
