Add detail to unreachable message #3267

Job	Run time
lint-receptor	1m 4s
lint-receptor	1m 4s
container	2m 8s
container	2m 8s
receptor (Go 1.20)	3m 33s
receptor (Go 1.20)	3m 54s
receptor (Go 1.21)	6m 37s
receptor (Go 1.21)	6m 37s
Lint receptorctl / Run `receptorctl` check_format session	16s
Lint receptorctl / Run `receptorctl` check_format session	16s
Lint receptorctl / Run `receptorctl` check_style session	20s
Lint receptorctl / Run `receptorctl` check_style session	20s
Receptorctl test coverage	0s
Run receptorctl tests${{ '' }}	0s
Receptorctl test coverage (coverage)	1m 2s
Run receptorctl tests / Run `receptorctl` tests-3.10 session	1m 6s
Run receptorctl tests / Run `receptorctl` tests-3.11 session	1m 1s
Run receptorctl tests / Run `receptorctl` tests-3.12 session	1m 1s
Run receptorctl tests / Run `receptorctl` tests-3.8 session	1m 19s
Run receptorctl tests / Run `receptorctl` tests-3.9 session	1m 10s
	34m 56s

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