Error: (substring) out of range
0
-32

        Call history:

        parley.scm:284: loop      
        parley.scm:283: reverse   
        list->string      
        parley.scm:283: string-split      
        parley.scm:520: read-raw          
        parley.scm:489: call-with-current-continuation    
        parley.scm:491: prompt-loop       
        parley.scm:426: refresh-line      
        parley.scm:139: ##sys#call-with-values    
        parley.scm:140: terminal-size     
        parley.scm:393: -         
        parley.scm:396: -         
        parley.scm:397: floor     
        parley.scm:399: min       
        parley.scm:401: modulo    
        parley.scm:402: substring               <--