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What we need, in contrast, is some means to define an alias that doesn't, by itself, cause an external definition of the symbol to be brought in. If the symbol is referenced directly elsewhere, however, then it must be defined. This is similar to the notion of weak references in garbage collection literature, in which a strong reference stops an object from being garbage-collected, but a weak reference does not. I've decided to name this kind of alias a weakref.
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