When this extension is enabled (it is by default), the Irie Pascal compiler will allow non-numeric statement labels. In Standard Pascal (i.e. ISO/IEC 7185), statement labels must be numeric and between 0 and 9999. When this extension is enabled, you can declare and use labels containing letters and underscores. NOTE: ISO/IEC 7185 is the standard for the Pascal porgramming language published by the Internation Organization for Standardization.
For example in the following program, loop is used as a statement label.
program name(output);
label loop;
var
i : integer;
begin
i := 1;
loop:
writeln(i);
i := i + 1;
if i <= 20 then goto loop;
end.