echo 'echo "0:$0 1:$1 2:$2"' >sourced1
set -- 1 2 3
"$THIS_SH" -c '. ./sourced1' arg0 arg1 arg2
echo Ok1:$?
"$THIS_SH" -c '. ./sourced1 q w e' arg0 arg1 arg2
echo Ok2:$?

rm sourced1