Set initial header level to <h2> explicitly because after removing
HEADER.rst top level headers become <h1> and so doesn't properly highlighted.
.. -*- coding: utf-8; -*-
=======
Perl.
=======
.. contents::
:local:
Print stack trace in Perl.
==========================
::
use Devel::StackTrace;
my $trace = Devel::StackTrace->new;
print $trace->as_string; # like carp
Print execution trace in Perl.
==============================
``Devel::Trace`` print out each line before it is executed (like ``sh -x``).