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From: AdaMagica <christ-usch.grein@t-online.de>
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Subject: Re: How does Ada.Text_IO.Enumeration_IO work?
Date: Thu, 3 Nov 2011 02:27:10 -0700 (PDT)
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Date: 2011-11-03T02:27:10-07:00
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A.10.10(8) ...reads an identifier according to the syntax of this
lexical element...

This means that reading stops as soon as a character is met that does
not belong to the syntax of enumerations. This means that reading must
use a look ahead. Otherwise it could not successfully read an input
string like
   Monday,
Here, reading stops after the character y, leaving the comma in the
input stream. Thus in your loop, after having read and output Monday,
reading begins with the comma and immediately stops again, raising the
exception, ad infinitum...