https://github.com/ruby/prism/commit/81e07f3cdb

Closes https://github.com/ruby/prism/issues/4112

Also see https://github.com/ruby/prism/issues/2501, for which this was done.
The expectation in rubocop is incorrect (produces code with semantic difference), so the test should be updated instead.

In any way, it should also have applied to `+`, where the same happens

https://github.com/ruby/prism/commit/1f8cae2a75

https://github.com/ruby/prism/commit/675f9c3be7

(https://github.com/ruby/prism/pull/3908)

* Add missing nodocs for FFI

When generating docs in ruby/prism, this doesn't seem to matter.

But on docs.ruby-lang.org these take over the actual documentation.

* Nodoc various utility methods

They don't tell much of a story and just pull attention away from actually unique methods

* Nodoc some private functions/modules

* Nodoc translator implementation details

As well as some functionality from ripper that is nodoc in ruby

* Stop documenting visitor implementation details

These result in so many methods that are searchable
and give no actual benefit.
Toplevel docs are all you need to understand the usecase.

https://github.com/ruby/prism/commit/0bd9a7d373

In the C API, we want to use slices instead of locations in the
AST. In this case a "slice" is effectively the same thing as the
location, expect it is represented using a 32-bit offset and a
32-bit length. This will cut down on half of the space of all of
the locations in the AST.

Note that from the Ruby/Java/JavaScript side, this is effectively
an invisible change. This only impacts the C/Rust side.

In the case of attribute writes, there are use cases where you want
to know the location of the = sign. (Internally we actually need
this for translation to the writequark AST.)

https://github.com/ruby/prism/commit/bfc798a7ec

https://github.com/ruby/prism/commit/12af4e144e

Given this code

```ruby
begin
  raise '42'
rescue => A[]
end
```

Prism fails with this backtrace

```
Error: test_unparser/corpus/literal/rescue.txt(Prism::ParserTest): NoMethodError: undefined method `arguments' for nil
prism/lib/prism/translation/parser/compiler.rb:1055:in `visit_index_target_node'
prism/lib/prism/node.rb:9636:in `accept'
prism/lib/prism/compiler.rb:30:in `visit'
prism/lib/prism/translation/parser/compiler.rb:218:in `visit_begin_node'
```

Seems like

```diff
-            visit_all(node.arguments.arguments),
+            visit_all(node.arguments&.arguments || []),
```

fixes the problem.

https://github.com/ruby/prism/commit/76d01aeb6c

Because it ends up treating it as a local variable, and `a.x`
is not a valid local variable name.

I'm not big on pattern matching, but conceptually it makes sense to me
to treat anything inside ^() to not be
pattern matching syntax?

https://github.com/ruby/prism/commit/80dbd85c45