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  1. or download this
    use strict;
use warnings;
...
warn "setter:", $x->foo(666);
warn "getter:", $x->foo;
warn "error:",  $x->foo(42,666);
  2. or download this
    -*- mode: compilation; default-directory: "d:/tmp/pm/" -*-
Compilation started at Fri Jan  8 21:39:32
...
Too many arguments for method 'BLA->foo(42,666)' at d:/tmp/pm/missing_
+param.pl line 34.

Compilation exited abnormally with code 255 at Fri Jan  8 21:39:33