Summary

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	File:     usage.icn

	Subject:  Procedures for service functions

	Author:   Ralph E. Griswold

	Date:     July 19, 1991

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   This file is in the public domain.

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     These procedures provide various common services:

     Usage(s)          stops executions with a message concerning the
                       expected form of usage of a program.

     Error(L[])	writes arguments to &errout and returns.


     ErrorCheck(l,f)	reports an error that has been converted to
                       failure.

     Feature(s)        succeeds if feature s is available in the running
                       implementation of Icon.

     Requires(s)	terminates execution is feature s is not available.

     Signature()	writes the version, host, and features support in
                       the running implementation of Icon.

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This file is part of the (main) package.

Error(L)

ErrorCheck(line, file)

Feature(s)

Requires(s)

Signature()

Usage(s)