checker: fix lambda generic param and return validation #2105

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Run time

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Job	Run time
linux (tcc)	54s
macos (clang)	2m 37s
linux (gcc)	3m 25s
ubuntu-docker-musl	2m 36s
linux (clang)	2m 29s
windows (tcc)	1m 9s
windows (gcc)	2m 52s
windows (msvc)	2m 18s
	18m 20s