CRASH: when making a struct with another struct field and initial value is missing

[Oldes Huhuman]

this is ok:

y: make struct! [ c [struct! [a [uint8!]]] ]

this is also ok:

x: make struct! [ a [uint8!] ]
y: make struct! [ c: [struct! [a [uint8!]]] x ]

but this is not:

y: make struct! [ c: [struct! [a [uint8!]]] ] ;<--- CRASH (as there is expected the value)