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sub function_called {
    my $calls = 0;

    return { return ++$callS }
}

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sub late_bound_sql {

...
# Use them.
&$lb1(2,4);  # Inserts x= 2, y= 4 to table foo.
&$lb2("cuttlefish");  # Inserts a= cuttlefish, b= NULL to table bar