Is this an error in compiler?

[reinert <reinkor@gmail.com>]

Hello,

I tried alire with the latest version of the compiler (I believe) and I got trouble
compiling this program (which I here have reduced just to communicate my point - i.e. the program has noe other meaning here):
--------------------------------------------------------------------------------------------
with Ada.Strings.Fixed; use Ada.Strings.Fixed;
with Ada.Exceptions;
with Ada.Text_IO;       use Ada.Text_IO;

procedure c0a is

subtype String_1 is String (1 .. <>);

package cpros is
   cfe0,cfe1,cfe2 : exception;
   generic
      with procedure execute_command1 (command1 : String);
   procedure cpros0
     (file1 : in Ada.Text_IO.File_Type; command0 : String := "");
end cpros;

package body cpros is

   procedure cpros0 (file1 : in Ada.Text_IO.File_Type; command0 : String := "")
   is
   begin
       declare
          function rep1 (str0 : String_1) return String is
             i : constant Natural := Index (str0, "$");
          begin
             return str0 when i = 0;
             raise cfe2 with "(wrong use of '$')" when i = str0'Last;  -- a 
        --   if i = str0'Last then                                     -- b
        --      raise cfe2 with "(wrong use of '$')";                  -- b
        --   end if;                                                   -- b
             return "aaa";
          end rep1;
          str0 : constant String := rep1 (Get_Line (file1));
       begin
         null;
       end;
   end cpros0;
end cpros;

   procedure execute_command1 (str : String) is
   begin
     null;
   end execute_command1;

   procedure cpros1 is new cpros.cpros0 (execute_command1 => execute_command1);

begin
  null;
end c0a;
-----------------------------------------------------------------------------------------------
This goes through when I compile it.

However, if I  uncomment out the "a" line and comment out the "b" line (see code above), then I get the error message:

c0a.adb:45:04: error: instantiation error at line 27
c0a.adb:45:04: error: "cfe2" is not visible
c0a.adb:45:04: error: instantiation error at line 27
c0a.adb:45:04: error: non-visible declaration at line 10

Have you the same experience?

reinert