/My/Project/One/File.pm      12    sub0: calling sub1
/My/Project/Another/File.pm  96        sub1: entering
/My/Project/Another/File.pm 105        sub1: calling sub2
/My/Project/Elsewhere.pm     72           sub2: entering
/My/Project/Elsewhere.pm     84           sub2: leaving
/My/Project/Another/File.pm 108        sub1: continuing after sub2
/My/Project/Another/File.pm 115        sub1: leaving
/My/Project/One/File.pm      16    sub0: continuing after sub1
# etc.