EMACS NINJA

apply, ad-Advice-foo and a lambda are placed on the stack. Then, stack element 3 (zero-indexed) is added to the top of stack. We already know that elements 0, 1 and 2 are the three constants, element 3 however is the first argument passed to the function. As it turns out, when lexical binding is enabled, the stack-ref opcode is used instead of varref. Therefore the byte-code presented is equivalent to (lambda (&rest arg) (apply 'ad-Advice-foo (lambda (x) "Add 1 to X." (1+ x))) arg). You can verify by disassembling that lambda and compare the output with the previous disassembly.

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