Get rid of trivial anonymous functions (part 1) #16600

Job	Run time
doctest (1.10, ubuntu-latest)	25m 14s
doctest (1.11-nightly, ubuntu-latest)	24m 20s
doctest (nightly, ubuntu-latest)	23m 58s
doctest (1.10, ubuntu-latest, depwarn=error)	25m 6s
doctest (1.10, macOS, RPTU)	13m 26s
test (1.6, short, ubuntu-latest)	36m 54s
test (1.6, long, ubuntu-latest)	27m 2s
test (1.10, short, ubuntu-latest)	38m 47s
test (1.10, long, ubuntu-latest)	24m 33s
test (1.11-nightly, short, ubuntu-latest)	26m 1s
test (1.11-nightly, long, ubuntu-latest)	24m 2s
test (nightly, short, ubuntu-latest)	24m 24s
test (nightly, long, ubuntu-latest)	22m 22s
test (1.10, short, ubuntu-latest, depwarn=error)	39m 27s
test (1.10, long, ubuntu-latest, depwarn=error)	21m 28s
test (1.10, short, macOS, RPTU)	10m 24s
test (1.10, long, macOS, RPTU)	7m 34s
test (1.10, book, ubuntu-latest)	48m 31s
	7h 43m 33s

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