upgraded-complex-part-type
typespec &optional environment ⇒ upgraded-typespec
typespec | a type specifier. |
environment | an environment object. The default is nil, denoting the null lexical environment and the and current global environment. |
upgraded-typespec | a type specifier. |
upgraded-complex-part-type returns the part type of the most specialized complex number representation that can hold parts of type typespec.
The typespec is a subtype of (and possibly type equivalent to) the upgraded-typespec.
The purpose of upgraded-complex-part-type is to reveal how an implementation does its upgrading.