Traceback (most recent call last)
nch.nim(524)             nch
sys.nim(43)              initialize
nch.nim(434)             :anonymous
nch.nim(258)             add
nch.nim(246)             initElem
assign.nim(132)          genericSeqAssign
assign.nim(96)           genericAssign
assign.nim(61)           genericAssignAux
gc.nim(294)              unsureAsgnRef
gc.nim(223)              decRef
SIGSEGV: Illegal storage access. (Attempt to read from nil?)