in an interactive shell, function definitions eval’ed in another function get a line number of 0 in declare -F output and in the presence of a DEBUG trap, they get some really bogus negative number (seems to depend on the line number where the function executed in the trap was defined?)
$ s() { eval "x() { :; }"; }; s; declare -F x
x 0 main
OTOH:
# filename: /tmp/rc#shopt -s extdebugf() { :; }
trap f DEBUG
$ $BASH --rcfile /tmp/rc
$ s() { eval "x() { :; }"; }; s; declare -F x
x -3 main
