[Pre-RFC] Bulk visibility syntax

I think this generally falls under the "alternative syntaxes" part of Frequently Requested Changes - The Rust Language Design Team.

I'd argue back considering this rule doesn't quite define what "alternative syntax" means beyond personal aesthetic dissatisfaction. Not to mention, there are also "contradictory" examples that are already in the language, most notably how extern has both singular and bulk syntax. I don't see how, say, having to type extern "C" and pub(crate) five times in a row are different, yet we have bulk extern { ... } syntax and absolutely no bulk visibility syntax.

But I don't want to make people have a coding standards conversation about which they should use in a codebase. I don't want to have to discuss which one rustfmt should use. Etc.

rustfmt wouldn't enforce any particular syntax "alternative" anyway, so I don't quite follow what you mean by that. However I see how conventional division could be an issue since visibility qualifiers are significantly hotter than extern, but I doubt it would make a huge difference in the end due to the unambiguous and deducible nature of the "alternative" syntax. Besides, there are also "contradictory" examples to this that are already in the language, for instance chained use vs use { ... }:

// syntax a
use foo::bar;
use bar::baz;
// syntax b
use { foo::bar, bar::baz };

Of course this is a rather primitive proposal, I mostly just wanted to see what people thought about it and whether if it would require significant internal rustc refactoring, that's about it.