return addrErr(hostport, missingPort)
		case i:
			// The expected result.
		default:
			// Either ']' isn't followed by a colon, or it is
			// followed by a colon that is not the last one.
			if hostport[end+1] == ':' {
				return addrErr(hostport, tooManyColons)
			}
			return addrErr(hostport, missingPort)
		}
		host = hostport[1:end]
		j, k = 1, end+1 // there can't be a '[' resp. ']' before these positions

            }
        }
        registry.realize("foo", ModelType.UNTYPED)

        then:
        def e = thrown(ModelRuleExecutionException)
        def missingProp = e.cause
        missingProp instanceof MissingPropertyException
        missingProp.property == 'unknown'

        when:
        modelDsl.configure {
            bah {
                defineSomeThing {
                    unknown {}