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What happened to LIBRARY LOCAL?

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I've got a document entitled 'Basic V Guide' which evidently originates  
 from Acorn and describes ARM BASIC 5 in some detail; it might even have  
been written by Sophie.  Included in the document is a detailed  
description of a LIBRARY LOCAL statement:

-----------------------------------------------------------------
LIBRARY LOCAL is used to define variables and arrays that will be
private to a library. Only the library will be able to reference
these variables and arrays.

The syntax of the statement is as follows:

         LIBRARY LOCAL <list of variables and arrays>

where <list of variable and arrays> is a list of variable and
array names separated by commas, for example:

         LIBRARY LOCAL abc%, def%, ghi$, jkl(), mno(), pqr$()
-----------------------------------------------------------------

It continues in the same vein for another page or so, with many examples.

I am not aware of any released version of BASIC 5 incorporating this  
statement, but judging by the amount of information in the document the  
implementation must have been worked out in considerable detail.  Does  
anybody know the history behind this?

Richard.
http://www.rtrussell.co.uk/

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What happened to LIBRARY LOCAL? "Richard Russell" <news@rtrussell.co.uk> - 2011-04-29 14:44 +0100
  Re: What happened to LIBRARY LOCAL? Matthew Wightman <matthew.wightman@gmail.com> - 2011-04-29 22:32 +0100
    Re: What happened to LIBRARY LOCAL? "Richard Russell" <news@rtrussell.co.uk> - 2011-04-30 10:33 +0100
      Re: What happened to LIBRARY LOCAL? Matthew Wightman <matthew.wightman@gmail.com> - 2011-04-30 11:09 +0100

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