CL-USER> (setf nn #j"aa")
#\SIMPLE-ERROR: ref vector out of range
at https://jscl-project.github.io/jscl.js:43039:7
at https://jscl-project.github.io/jscl.js:43042:3
at Object.JSCL_USER_ERROR [as fvalue] (https://jscl-project.github.io/jscl.js:43043:3)
at internals.error (https://jscl-project.github.io/jscl.js:83:12)
at https://jscl-project.github.io/jscl.js:9583:26
at https://jscl-project.github.io/jscl.js:9585:3
at JSCL_USER_AREF (https://jscl-project.github.io/jscl.js:9586:3)
at Object.mvcall (https://jscl-project.github.io/jscl.js:73:10)
at https://jscl-project.github.io/jscl.js:6670:27
at https://jscl-project.github.io/jscl.js:6671:3
at Object.JSCL_USER_CHARNAME [as fvalue] (https://jscl-project.github.io/jscl.js:6672:3)
at https://jscl-project.github.io/jscl.js:26285:205
at JSCL_USER_WRITECHARAUX (https://jscl-project.github.io/jscl.js:26286:3)
at Object.mvcall (https://jscl-project.github.io/jscl.js:73:10)
at https://jscl-project.github.io/jscl.js:26404:54
at https://jscl-project.github.io/jscl.js:26443:3
at Object.JSCL_USER_WRITEAUX [as fvalue] (https://jscl-project.github.io/jscl.js:26447:4)
at JSCL_USER_NIL (https://jscl-project.github.io/jscl.js:26561:7)
at Object.mvcall (https://jscl-project.github.io/jscl.js:73:10)
at https://jscl-project.github.io/jscl.js:26570:18
... 23 more frames, increase JSCL::*BACKTRACE-LIMIT* to view more
CL-USER> (setf nn #j"aaa")
#j"aaa"
```lisp