Method code for $and_lock_frob.new_lock()

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arg lhs, rhs;

if (type(lhs) != 'frob || type(rhs) != 'frob)
    throw(~perm, "Arguments are not both frobs.");
return (<this(), [lhs, rhs]>);

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// Created 27-Mar-1995 as a part of ColdCore, see: @help Credit