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use only_hack_old_rustc for proc_macro_hack #2243

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Oct 28, 2020
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@ordian ordian commented Oct 28, 2020

@taiki-e taiki-e self-requested a review October 28, 2020 18:18
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Thanks! only_hack_old_rustc may cause breakage related to hygiene, but hopefully it will only give us a few new warnings and will not cause compile failures.

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