regression: test demo fails: SIGSEGV: Illegal storage access

[timotheecour]

cd nimx
cd test
nake
SIGSEGV: Illegal storage access

upon further inspection:
nake produces (and runs) ./nakefile; and running ./nakefile compiles a nim binary (IIUC) and runs this binary then produces that SIGSEGV: Illegal storage access

however I have no way to know which is that binary (so I can't debug that program via lldb ; see fowlmouth/nake#64 ; also, I can't debug via lldb ./nakefile either, this time because of nim-lang/Nim#9634)

Note:
after echo-style debugging it crashes here: inside result = superTypeAux(getImpl(t[1].symbol))

proc superTypeAux(t: NimNode, indent: int): NimNode =
    doAssert(indent < 10, "Recursion too deep")

    template superTypeAux(t: NimNode): NimNode = superTypeAux(t, indent + 1)
    proc log(args: varargs[string, `$`]) =
        discard
        # echo "- ", "  " * indent, args.join(" ")

    log "superTypeAux: ", treeRepr(t)
    case t.kind
    of nnkSym:
        if $t == "RootRef": return t
        let ty = getTypeImpl(t)
        log "TypeKind: ", ty.typeKind
        result = superTypeAux(ty)
    of nnkBracketExpr:
        echo "ok1"
        echo t.len
        echo t[1] == nil
        result = superTypeAux(getImpl(t[1].symbol))
        echo "ok2"

EDIT
maybe even crashes here: getTypeImpl(t[^1]) in result = superTypeAux(getTypeImpl(t[^1])) in the nnkRefTy clause

[timotheecour]

/cc @yglukhov
looks like it was same root cause with nim-lang/Nim#9600 because after rebuilding after the commit that fixed it (nim-lang/Nim@fc740c5) this now works; thanks @jcosborn !