use strict;
use warnings;
use 5.010;

{package Cow;
	sub speak {
		say "Mooo.";
	}
}

my $meth_name = "speak";
Cow->$meth_name;

--output:--
Mooo.

##</code><code>##

Cow->"speak";

--output:--
String found where operator expected at C:\Users\Me\Documents\perl2.pl line 13, near "->"speak""
	(Missing operator before "speak"?)
syntax error at C:\Users\Me\Documents\perl2.pl line 13, near "->"speak""
Execution of C:\Users\Me\Documents\perl2.pl aborted due to compilation errors.