E4155

Cycle in const or fnalias declaration.

const declaration can refer to other constants defined in the same package, and fnalias can alias other function alias in the same package, too. But these definitions must not form cycle, otherwise this error will be reported.

Erroneous example

const A : Int = B + 1
const B : Int = A + 1

fnalias f = g
fnalias g = f