Add internal error check #20

Job	Run time
cackle	1m 35s
cargo-deny (advisories)	44s
fmt	13s
cargo-deny (bans licenses sources)	45s
build (gcc, current)	1h 3m 47s
build (gcc, current, --check-test-tx-meta)	53m 1s
rust-check-git-rev-deps	20s
build (gcc, next)	1h 4m 55s
build (gcc, next, --check-test-tx-meta)	53m 4s
build (clang, current)	54m 26s
build (clang, current, --check-test-tx-meta)	48m 18s
build (clang, next)	55m 54s
build (clang, next, --check-test-tx-meta)	51m 4s
complete	1s
	7h 28m 7s

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