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perl -MDevel::Trace::Subs=install_trace -e 'install_trace(file => "Dat
+a::Dump")'

use warnings;
use strict;
...
sub three {
    dd two();
}

{ a => 1, b => 2 }

use warnings;
use strict;
...
sub three {
    dd two();
}

{ a => 1, b => 2 }

...
    file:    /usr/local/share/perl/5.22.1/Data/Dump.pm
    line:    65
    package: Data::Dump

perl -MDevel::Trace::Subs=remove_trace -e 'remove_trace(file => "Data:
+:Dump")'