Controls what happens when an unexpected right parentheses is found during reading.
system
nil
The variable *right-paren-whitespace* controls what happens when an unexpected right parenthesis is found during reading. It can have the following values:
| nil | 
Signal an error, as specified by ANSI Common Lisp. | 
| t | 
Silently treat it as whitespace. | 
| :warn | 
Signal a warning and treat it as whitespace. | 
*right-paren-whitespace* is newly documented in LispWorks 8.0 but has existed is all versions of LispWorks.
LispWorks® User Guide and Reference Manual - 01 Dec 2021 19:31:02