Report mods in `ParseCallbacks::new_item_found` #3011

Job	Run time
docs	26s
check-cfg	23s
msrv	51s
quickchecking	19s
minimal	18s
rustfmt-clippy	12s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 46s
test-expectations (ubuntu-latest)	48s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 43s
test-book	14s
test-expectations (macos-latest)	1m 7s
test-no-headers	25s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 43s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 55s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 26s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 12s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 11s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 16s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 16s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 16s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	4m 2s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	4m 13s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	5m 4s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 45s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 58s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 49s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 26s
test (macos-latest, 16.0, 0, 0, 0)	2m 30s
success	1s
	1h 2m 35s

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