I put your code snippet in the playground for easier sharing: https://play.golang.org/p/ZvuNwjS7ZF
I think the spec has the answer you're looking for regarding how named result parameters are handled during a panic. https://golang.org/ref/spec#Defer_statements Specifically the sentence: > If the deferred function has any return values, they are discarded when > the function completes. (See also the section on handling panics > <https://golang.org/ref/spec#Handling_panics>.) > Also, > If the function's signature <https://golang.org/ref/spec#Function_types> > declares > result parameters, the function body's statement list must end in a > terminating > statement <https://golang.org/ref/spec#Terminating_statements>. > https://golang.org/ref/spec#Function_declarations And the panic is the 'terminating statement' Hope this helps, Vasko. On Thursday, August 25, 2016 at 4:19:17 PM UTC-6, dc0d wrote: > > Assuming we have this test: > > func TestRecover(t *testing.T) { > f := func() (interface{}, error) { > panic(`TEST`) > } > r, e := Recover(f) > t.Log(r, e) > } > > And two versions of *Recover* function. > > Version 1: > func Recover(f func() (interface{}, error)) (interface{}, error) { > var result interface{} > var err error > > defer func() { > if e := recover(); e != nil { > err = errors.Error(fmt.Sprintf("%v", e)) > } > }() > > result, err = f() > > return result, err > } > > > Version 2: > func Recover(f func() (interface{}, error)) (res interface{}, err error) { > defer func() { > if e := recover(); e != nil { > err = errors.Error(fmt.Sprintf("%v", e)) > } > }() > > res, err = f() > > return res, err > } > > > *Question:* Why the output of test for Version 1 is *<nil> <nil>* (*not > expected/wrong*) but for Version 2 is *<nil> TEST* (*as expected/correct* > )? > > - Go 1.7, Ubuntu 14.04 x64 > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
