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# while naming a sub like in:
defined &my_sub_name;
...
# making a reference to a sub
$coderef   = \&handler;

    &foo(1,2,3);    # pass three arguments
    foo(1,2,3);     # the same
...
    &foo();         # the same
    &foo;           # foo() get current args, like foo(@_) !!
    foo;            # like foo() IFF sub foo predeclared, else "foo"