testsuite: Add testcase for #16415
I verified this testcase with following build condition:
- GHC-8.6.3 source
- Ubuntu 18.04LTS
-
quickflavour +GhcLibHcOpts=-O -haddock
I have not tested under various build conditions for each platform.
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I verified this testcase with following build condition:
quick flavour + GhcLibHcOpts=-O -haddock
I have not tested under various build conditions for each platform.