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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Get_Immediate has  raised  CONSTRAINT_ERROR : s-wchcnv.adb:207
 explicit raise
Date: Wed, 18 Feb 2015 20:16:14 +0000
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Date: 2015-02-18T20:16:14+00:00
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Someone was asking a very closely related question (i.e. the very same
constraint error) on Stack Overflow recently [1].

The answer there was to open the input file with a non-default wide
character encoding method: Form => "WCEM=8" was suggested.

Not sure how to get this effect on standard input.You could try
compiling with -gnatW8.

[1] http://stackoverflow.com/q/28486505