On Sun, Sep 27, 2020 at 10:23 AM Nicolas Grekas <nicolas.gre...@gmail.com> wrote:
> Hi Benjamin, hi everyone > > I'm wondering if the syntax that allows for several attributes is really > future-proof when considering nested attributes: > > > *1.* > #[foo] > #[bar] > > VS > > > *2.* > #[foo, bar] > > Add nested attributes to the mix, here are two possible ways: > > > *A.* > #[foo( > #[bar] > )] > > or > > > *B.* > #[foo( > bar > )] > > The A. syntax is consistent with the 1. list. > I feel like syntax B is not desired and could be confusing from a grammar > pov. > BUT in syntax 2., we allow an attribute to be unprefixed (bar), so that > syntax B is consistent with 2. > > Shouldn't we remove syntax 2. in 8.0 and consider it again when nested > attributes are introduced? > > I voted yes for syntax 2. when the attributes were using << >>. I would > vote NO now with the new syntax. > > Nicolas > As far as my understanding goes, if we introduce "nested" attributes, it will be in the form of relaxing constraints on constant expressions, i.e. by allowing you to write #[Attr(new NestedAttr)]. Nikita
