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factory: don't reload previously defined formulae
build.rb calls Formula.factory to get a usable Formula object to pass to its install method. However, because the formula file is the actual executing script, its class is already defined, and loading it again causes the class to be re-evaluated, which, unfortunately, is not idempotent. This bug has existed for a very long time, and its side effects include duplicate entries the deps array and mirrors array, among others. Fortunately, the fix is very simple. Signed-off-by: Jack Nagel <email@example.com>
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