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 *package* variable 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.
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