If I have this struct: (defstruct foo (x 0 :type 'fixnum)) and this array: (defvar arr (make-array 0 :element-type 'foo :adjustable t :fill-pointer 0)) and then do the following: (vector-pu...

I want to use formatted output in a loop to generate a string. Manual says it can be easily done by giving format function a string with a fill pointer as a destination. Unfortunately, it is not tr...