에러

error warn 'simple-error (signal (make-condition 'error) ) (define-condition my-condition (simple-condition) // 사용자 에러 정의 )

// sb-xc (ignore-errors (error "wtf")) (unwind-protect (error "wtf") )

(invoke-debugger (trivial-backtrace:print-backtrace https://github.com/hraban/trivial-backtrace Portable simple API to work with backtraces in Common Lisp

handle-case https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node346.html https://lisp-docs.github.io/cl-language-reference/chap-9/j-b-condition-system-concepts

https://cl-community-spec.github.io/pages/handler_002dbind.html