SymCoEx: obj SymmetricCoroutineSystemLib.SymmetricCoroutineSystem
nextCh: obj
T: ref String.String
inx: var integer
get:
out ch: var char
DoubleAtoB: obj SymmetricCoroutine
ch: var char
Vxx: var integer
DoubleBtoC: obj SymmetricCoroutine
ch: var char