On Tue, Oct 11, 2016 at 12:16 PM Henry <henry.adisuma...@gmail.com> wrote:

This should work.

func Execute() (err error) {
        defer func() {
                if err == nil {
                        err = Commit()
                if err != nil {

        err = Process()
        return err

> It appears to me that defer works with the local copy of the variable,
instead of a direct reference. I think as a rule I mustn't make any
variable assignment in defer. I wonder whether this is by design.

It's WAI. *After* the `return err` statement is executed the original
version of Execute invokes the deferred func which then changed the local
`err` variable so it has no effect on the already set return value. To
change the return value in a deferred function the return variable must be
named so the deferred function can set its value.



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