Devel::TraceFuncs provides utilities to trace the
execution of a program.  It can print traces that look
something like:

+-> global: '0'
|  +-> main::fo(4, 5) (in ./t.pm:32): 'now then'
|  |  +-> main::fp(4, 5) (in ./t.pm:19)
|  |  |  +-> main::fq() (in ./t.pm:13)
|  |  |  |  que pee doll (in ./t.pm:8)
|  |  |  +-< main::fq() (in ./t.pm:13)
|  |  |  cee dee (in ./t.pm:14)
|  |  +-< main::fp(4, 5) (in ./t.pm:19)
|  |  ha
|  |  hs (in ./t.pm:20)
|  +-< main::fo(4, 5) (in ./t.pm:32): 'now then'
|  done (in ./t.pm:34)
+-< global: '0'

WWW: https://metacpan.org/release/traceFunc