On Mon, Nov 6, 2017 at 2:50 PM, Josh Humphries <jh...@bluegosling.com> wrote: > > I think I've found a bug regarding reflect.ArrayOf. The go doc is a bit > light, but suggests that the resulting type is a proper array type. However, > I've found that the resulting type has a few flaws: > > The resulting array type violates part of the language spec about arrays: it > cannot be used as a map key. Using an array whose type was created via > reflect.ArrayOf as a key in a map results in a runtime panic: > > runtime error: hash of unhashable type [8]int32 > > See the link below for an example program that shows this error. > > The resulting array type seems to violate the reflect package Go doc > regarding reflect.Type and type equality. The package doc states this: > > Type values are comparable, such as with the == operator. Two Type > values are equal if they represent identical types. > > And the section about type identity in the language spec states this: > > Two array types are identical if they have identical element types and > the same array length. > > However, an array type created using reflect.ArrayOf returns false when > compared to an identical type that was not created using reflect.ArrayOf. > > The link below also shows an example of this erroneous behavior. > > Demonstrations of these issues: > https://play.golang.org/p/Qu0irn2rCF > > I am guessing I should just file a bug in a Github issue, but wanted to > first check to see if this, somehow, might be expected behavior. (And if so, > to learn why.)
This is not expected behavior. Oddly, I can not recreate the problem. I mean, I see that it happens on the playground, but it seems to work correctly when I run the program on my laptop. Ah, but it fails, at least on tip, if I use `GOARCH=386`. Please do open an issue. Thanks. Ian -- 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.
