Several ways (overkill answer, but leaving all options I know because why not): You can try evaluating this in the scratch buffer (if (member 'nativecomp

Several ways (overkill answer, but leaving all options I know because why not): You can try evaluating this in the scratch buffer (if (member 'nativecomp features) (message "yay") (message "nay")) Or check if a non-interactive function called `native-compile` exists. Or open help for an elisp function (next-line, for example): c-h f next-line RET Gives me: next-line is an interactive native compiled Lisp function in ‘simple.el’. Or, m-x disassemble next-line RET