self-appending code

[an_dy]

I created a first simple program to append code to itself (script below). Is
there a way to get that code interpreted in the same execution? That didn't
happen, but when I started it a second time, the first appended text was
interpreted, the second again not.

main code
filename: prg2.pl

print"prg2 part1 \n\n";
open (DAT,">>prg2.pl") || die"failure:\n$!";
print DAT "\n#Appendix";
print DAT "\nprint\"prg2 part2\";";
close (DAT);

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