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package body Tail_Call_P is
function Start_Side (Element : T) return Index is
begin
if Element = 1 then
raise Program_Error;
end if;
if Element = 0 then
return Second;
else
return First;
end if;
end;
function Segment (Element : T) return T is
begin
if Element /= 0 then
raise Program_Error;
end if;
return 1;
end;
procedure Really_Insert (Into : T; Element : T; Value : T) is
begin
if Into /= 0 then
raise Program_Error;
end if;
end;
procedure Insert (Into : A; Element : T; Value : T) is
begin
Really_Insert (Into (Start_Side (Element)), Segment (Element), Value);
end Insert;
end Tail_Call_P;
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