or download this
package C1; use M1 v1.0 qw/&foo bar baz quux bazola $ztesch --dump/;
#package C2; use M2 v1.0 qw/ foo baz $ztesch :tag1 --dump/;
package C3; use M3 v1.0 qw/foo --dump/; print "so what?\n";
package C4; use M2 v2.3.4.5 qw/foo baz --dump/;