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"GNU Emacs 23.2.1 (i386-mingw-nt5.1.2600) of 2010-05-08 on G41R2F1" ;; When I byte compile this file and load it and try to evaluate (foo) ;; Emacs will either crash or (foo) returns some odd number on my machine. (defmacro bar (&rest body) (let ((v (make-symbol ""))) ; Crashes with "" as name. `(let ((,v (catch :eof ,@body))) (when (not (eq ,v :eof)) ,v)))) (defun foo () (bar (message "Hello World!"))) ;; (disassemble 'foo) ;; ;; byte code for foo: ;; args: nil ;; 0 constant (message "Hello World!") ;; 1 constant (out-of-range 2) ;; 2 catch ;; 3 dup ;; 4 varbind #::eof ;; 5 constant (message "Hello World!") ;; 6 eq ;; 7 not ;; 8 goto-if-nil-else-pop 1 ;; 11 varref #::eof ;; 12:1 unbind 1 ;; 13 return ;; ;; Looks like there's a problem in line 4 & 11.