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{ tests if '' is optimized properly in string concatenations }
var
s1 : string;
s2 : string;
begin
s1:='asdf';
if s1+''<>s1 then
halt(1);
s1:='asdf';
if ''+s1<>s1 then
halt(1);
if ''+s2+''+s1+''<>s2+s1 then
halt(1);
writeln('ok');
end.
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