CharInSet Compiler Warning in Delphi XE4

Question

I have following statement in my Delphi 7 code.

TMyCharSet = set of char;

When I migrated that code to Delphi XE4, I am getting following compi

Answer 1

See fourm suggestions from web:

if not (CharInSet(Key,['0'..'9',#8]) then key := #0;

From: http://www.activedelphi.com.br/forum/viewtopic.php?t=66035&sid=f5838cc7dc991f7b3340e4e2689b222a