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ghc panic, "impossible" happened while running tests, failed to load shared object

Here's the message I got from within GHCI. (The first line is the command, tests, that I had just run.)

> tests
ghc: panic! (the 'impossible' happened)
  (GHC version 8.6.3 for x86_64-unknown-linux):
        Loading temp shared object failed: /tmp/user/1000/ghc24072_0/libghc_36.so: undefined symbol: RsltziRValid_validRslt_closure

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Here's the commit of the branch of the code I was working on when this happened.

I keep the test suite in the main body of code, so that I can run it from within GHCI. That's what I was doing when it happened.

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