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updates for compatibility with GHC `HEAD` #1108

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Run time

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Job	Run time
test (ubuntu-latest, 9.6)	21m 49s
test (ubuntu-latest, 9.4)	19m 20s
test (ubuntu-latest, 9.2)	18m 14s
test (windows-latest, 9.6)	23m 24s
test (macOS-latest, 9.6)	25m 31s
	1h 48m 18s