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parley crash added by simias on Fri Oct 25 10:20:11 2013

Error: (string-length) bad argument type: ("\n")

        Call history:

        parley.scm:422: alist-ref         
        parley.scm:429: string-null?      
        parley.scm:434: newline   
        parley.scm:435: return    
        parley.scm:165: history   
        parley.scm:163: g277      
        parley.scm:200: syntax-check      
        parley.scm:204: history-max-lines         
        parley.scm:205: history-max-lines         
        parley.scm:506: loop      
        parley.scm:504: peek-char         
        parley.scm:505: reverse   
        parley.scm:517: restore-terminal-settings         
        parley.scm:123: stty#set-terminal-attributes!     
        stty.scm:206: port?       
        stty.scm:206: port->fileno              <--

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What's the one-argument procedure to check if a list is empty?
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