check

add @hashmap.T::iter2 #4169

Job	Run time
bleeding-check (macos-latest)	1m 16s
bleeding-check (ubuntu-latest)	1m 51s
build (ubuntu-latest)	1m 50s
license-header-check	3s
build (macos-latest)	1m 19s
coverage-check	15s
build (macos-13)	2m 37s
nightly-check (ubuntu-latest)	1m 48s
typo-check	2s
build (windows-latest)	1m 21s
nightly-check (macos-latest)	1m 10s
nightly-check (macos-13)	2m 0s
nightly-check (windows-latest)	1m 29s
	17m 1s

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