bug#21072: Brave new mark-defun (and a testing tool)

[Stefan Monnier]

> Running:

I assume you mean "without compilation" (i.e. using only the .el file).

> | form                            | evaled? | compiled? |
> |---------------------------------+---------+-----------|
> | (defun ...)                     | yes     | no        |
> | (eval-when-compile (defun ...)) | no      | no        |
                                      ^^
                                      yes

> Compilation:

And 

> | form                            | evaled? | compiled? |
> |---------------------------------+---------+-----------|
> | (defun ...)                     | no      | yes       |
> | (eval-when-compile (defun ...)) | yes     | yes       |
                                                ^^^
                                                no

Instead, the whole expression is compiled as a constant holding the
value returned from the evaluation.  Hence this can be used for things
like (eval-when-compile (+ 3 4)).


        Stefan