in-package name → package

name — a string designator; not evaluated.

package — the package named by name.

Causes the the package named by name to become the current package — that is, the value of *package*. If no such package already exists, an error of type package-error is signaled.

Everything in-package does is also performed at compile time if the call appears as a top level form.

The variable *package* is assigned. If the in-package form is a top level form, this assignment also occurs at compile time.

An error of type package-error is signaled if the specified package does not exist.

*package*