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Before this commit, Symbol.associatedFile used to be broken in two ways.
Firstly, it was never autoloaded (just like we used to have flags,
privateWithin and annotations). Secondly, it was never filled in by runtime
reflection.
My first attempt at fixing those problems was, well, just fixing them.
However, its runtime implementation was based on a hacky function that
we were not very much excited about supported (see comments),
whereas its compile-time usefulness was somewhat questionable.
Therefore the second attempt at fixing this bug is deprecating the API
altogether, replacing it with `Symbol.pos.source`.
Since `Symbol.pos` isn't retained for runtime consumption,
`Symbol.pos.source` is still going to return `NoAbstractFile` as before
this commit, but that's left for future work, and suggested approach
is documented in SI-8259.
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