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$myobject->ymd;

$myobject->ymd();

$myobject->ymd $foo;

$myobject->ymd($foo);

> perl -wle "$myobject = bless {}; $myobject->ymd $foo"
Scalar found where operator expected at -e line 1, near "->ymd $foo"

Can't locate object method "ymd" via package "123456"