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my $r = \{expr};

my @rv = expr;
my %h = @rv;
my $hr = \%h;
my $r = \$hr;

$ThingsToDo{firstTask};

&{$ThingsToDo{firstTask}}();

$ThingsToDo{firstTask}->();

my %ThingsToDo = (
   firstTask => sub { my $pkg = shift; $pkg->prepare(@_) },
...
...

$ThingsToDo{firstTask}->($project);