/// <summary>
/// Returns a constructed type given the type it is constructed from and type arguments for its enclosing types and itself.
/// </summary>
/// <param name="declaredType">the declared type to construct the result from</param>
/// <param name="typeArguments">the type arguments that will replace the type parameters, starting with those for enclosing types</param>
/// <returns></returns>
internal static NamedTypeSymbol DeepConstruct(this NamedTypeSymbol declaredType, ReadOnlyArray <TypeSymbol> typeArguments)
{
Debug.Assert(declaredType.OriginalDefinition == declaredType);
return(new TypeMap(declaredType.AllTypeParameters().AsReadOnly <TypeSymbol>(), typeArguments).SubstituteNamedType(declaredType));
}