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diff --git a/src/multi_precision_integers-check.adb b/src/multi_precision_integers-check.adb
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--- a/src/multi_precision_integers-check.adb
+++ /dev/null
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-
-
-------------------------------------------------------------------------------
---
---  Copyright (c) 2007 G. de Montmollin, Univ. Neuchatel
---
---  Permission is hereby granted, free of charge, to any person obtaining a copy
---  of this software and associated documentation files (the "Software"), to deal
---  in the Software without restriction, including without limitation the rights
---  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
---  copies of the Software, and to permit persons to whom the Software is
---  furnished to do so, subject to the following conditions:
---
---  The above copyright notice and this permission notice shall be included in all
---  copies or substantial portions of the Software.
---
---  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
---  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
---  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
---  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
---  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
---  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
---  SOFTWARE.
---
-------------------------------------------------------------------------------
-
-
-
-
-with Ada.Text_IO; use Ada.Text_IO;
--- !! will disappear in favour of Ada.Exceptions
-
-with Multi_precision_integers.IO;
-
-package body Multi_precision_integers.Check is
-
-  package IOi renames Multi_precision_integers.IO;
-
-  -- Don't be afraid by the bug reporting tools,
-  -- they are unlikely to pop out of a programme ;-)
-
-  Bug_file: Ada.Text_IO.File_type;
-  Bug_file_name: constant String:= "mupreint.bug";
-
-  -- The flaw detection (DEBUG mode) could suffer from
-  -- a chicken-and-egg problem: e.g. "*" works, but the "/"
-  -- to verify it doesn't !
-
-  Multiply_flawed_div1_has_rest       : exception;
-  Multiply_flawed_div1_wrong_quotient : exception;
-  Multiply_flawed_div2_has_rest       : exception;
-  Multiply_flawed_div2_wrong_quotient : exception;
-
-  Div_Rem_flawed : exception;
-
-  procedure Open_Bug_Report is
-  begin
-    Create( Bug_file, out_file, Bug_file_name );
-    Put_Line( Bug_file, "Bug in Multi_precision_integers");
-  end Open_Bug_Report;
-
-  procedure Close_Bug_Report is
-  begin
-    Close( Bug_file );
-    -- These console messages can provoke a silent quit in GUI apps,
-    -- so we put them after closing the report.
-    Put_Line( "Bug in Multi_precision_integers !");
-    Put_Line( "For details, read file: " & Bug_file_name);
-  end Close_Bug_Report;
-
-  procedure Test( m: multi_int; test_last: Boolean:= True ) is
-    last_nz: index_int:= 0;
-    Negative_block,
-    Last_index_has_zero,
-    Field_last_outside_range, Field_last_is_negative: exception;
-  begin
-    if m.zero then return; end if; -- 0, nothing to test
-    if m.last_used > m.n then raise Field_last_outside_range; end if;
-    if m.last_used <   0 then raise Field_last_is_negative; end if;
-    for i in 0 .. m.last_used loop
-      if m.blk(i) < 0 then
-        raise Negative_block;
-      end if;
-      if m.blk(i) /= 0 then
-        last_nz:= i;
-      end if;
-    end loop;
-    if test_last and then 0 < last_nz and then last_nz < m.last_used then
-      raise Last_index_has_zero;
-    end if;
-  end Test;
-
-  procedure Check_Multiplication(i1,i2,i3: in multi_int) is
-    jeu: constant:= 5; -- 0 suffit
-    q1: Multi_int( i2.last_used + jeu );
-    r1: Multi_int( i1.last_used + i2.last_used + jeu );
-    q2: Multi_int( jeu );
-    r2: Multi_int( i2.last_used + jeu );
-
-    procedure Bug_Report is
-    begin
-      Open_Bug_Report;
-      Put_Line( Bug_file, "Multiply_and_verify");
-      Put( Bug_file, "i1 ="); IOi.Put_in_blocks(Bug_file, i1); New_Line(Bug_file);
-      Put( Bug_file, "i2 ="); IOi.Put_in_blocks(Bug_file, i2); New_Line(Bug_file);
-      Put( Bug_file, "i3 ="); IOi.Put_in_blocks(Bug_file, i3); New_Line(Bug_file);
-    end Bug_Report;
-
-  begin
-    Test(i1);
-    Test(i2);
-
-    if not (i1.zero or i2.zero) then
-      -- Now we divide i3 by i1, q1 should be = i2
-      Div_Rem_internal_both_export(i3,i1, q1,r1);
-      if not r1.zero then
-        Bug_Report;
-        Close_Bug_Report;
-        raise Multiply_flawed_div1_has_rest;
-      end if;
-      if not Equal( q1, i2 ) then
-        Bug_Report;
-        Put( Bug_file, "q1 ="); IOi.Put_in_blocks(Bug_file, q1); New_Line(Bug_file);
-        Close_Bug_Report;
-        raise Multiply_flawed_div1_wrong_quotient;
-      end if;
-      -- Now we divide q1 by i2, should be = 1
-      Div_Rem_internal_both_export(q1,i2, q2,r2);
-      if not r2.zero then
-        Bug_Report;
-        Close_Bug_Report;
-        raise Multiply_flawed_div2_has_rest;
-      end if;
-      if not Equal( q2, Multi(1) ) then
-        Bug_Report;
-        Put( Bug_file, "q2 ="); IOi.Put_in_blocks(Bug_file, q1); New_Line(Bug_file);
-        Close_Bug_Report;
-        raise Multiply_flawed_div2_wrong_quotient;
-      end if;
-    end if;
-
-  end Check_Multiplication;
-
-  procedure Check_Div_Rem(i1,i2,q,r: in multi_int) is
-
-    procedure Bug_Report is
-    begin
-      Open_Bug_Report;
-      Put_Line( Bug_file, "Div_Rem_and_verify");
-      Put( Bug_file, "i1 ="); IOi.Put_in_blocks(Bug_file, i1); New_Line(Bug_file);
-      Put( Bug_file, "i2 ="); IOi.Put_in_blocks(Bug_file, i2); New_Line(Bug_file);
-      Put( Bug_file, "q  ="); IOi.Put_in_blocks(Bug_file, q); New_Line(Bug_file);
-      Put( Bug_file, "r  ="); IOi.Put_in_blocks(Bug_file, r); New_Line(Bug_file);
-    end Bug_Report;
-
-  begin
-    Test(i1);
-    Test(i2);
-
-    if not Equal( i1, i2*q + r ) then
-      Bug_Report;
-      Close_Bug_Report;
-      raise Div_Rem_flawed;
-    end if;
-
-    Test(q);
-    Test(r);
-  end Check_Div_Rem;
-
-end Multi_precision_integers.Check;