The for-as-package subclause (ANSI and GNU Common Lisp Document)

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#### 6.1.2.13 The for-as-package subclause

In the for-as-package subclause the `for` or `as` construct iterates over the symbols in a package. In this syntax, a compound preposition is used to designate access to a package. The variable var takes on the value of each symbol in the supplied package. The following loop keywords serve as valid prepositions within this syntax:

`being`

  The keyword `being` introduces either the Loop schema `symbol`, `present-symbol`, or `external-symbol`.

`each`, `the`

  The loop keyword `each` follows the loop keyword `being` when `symbol`, `present-symbol`, or `external-symbol` is used. The loop keyword `the` is used with `symbols`, `present-symbols`, and `external-symbols` only for ease of reading. This agreement isn’t required.

`present-symbol`, `present-symbols`

  These Loop schemas iterate over the symbols

  that are present in a package.

  The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled.

`symbol`, `symbols`

  These Loop schemas iterate over symbols that are accessible in a given package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled.

`external-symbol`, `external-symbols`

  These Loop schemas iterate over the external symbols of a package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled.

`in`, `of`

  These loop prepositions introduce package.

In effect

`being` {`each` | `the`} {`symbol` | `symbols` | `present-symbol` | `present-symbols` | `external-symbol` | `external-symbols`} {`in` | `of`}

is a compound preposition.

Iteration stops when there are no more symbols to be referenced in the supplied package.

Next: Examples of for-as-package subclause, Previous: The for-as-hash subclause, Up: Variable Initialization and Stepping Clauses