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Consider the case of building a stage1 compiler. `hschooks.c` will be built by stage0 `ghc` and linked against the `stage0` RTS. Despite this it was #including the stage1 `Rts.h`. There is, of course, no guarantee that this is ABI-compatible with the stage0 RTS and when they diverge Bad Things happen (e.g. bells ringing at inappropriate times in D2699). Test Plan: Validate Reviewers: simonmar, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2763
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