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updates for compatibility with GHC `HEAD` #1100

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Run time

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Job	Run time
test (ubuntu-latest, 9.6)	18m 10s
test (ubuntu-latest, 9.4)	20m 43s
test (ubuntu-latest, 9.2)	21m 57s
test (windows-latest, 9.6)	25m 31s
test (macOS-latest, 9.6)	24m 36s
	1h 50m 57s