Change rescue modifier binding power from PM_BINDING_POWER_COMPOSITION
to PM_BINDING_POWER_MATCH + 1, so that `x = a rescue b in c` is parsed
as `(x = (a rescue b)) in c` and `def f = a rescue b in c` is parsed
as `(def f = (a rescue b)) in c`.

https://github.com/ruby/prism/commit/7e797f59ae

in is a unique keyword because it can be the start of a clause or
an infix keyword. We need to be explicitly sure that even though in
_could_ close an expression context (the body of another in clause)
that we are not also parsing an inline in. The exception is the
case of a command call, which can never be the LHS of an expression,
and so we must immediately exit.

[Bug #21925]
[Bug #21674]

https://github.com/ruby/prism/commit/20374ced51

They currently complain that the parent method is not forwarding.
But the actual problem is that these types of arguments simply don't
accept `...`

Fixes [Bug #21927]

https://github.com/ruby/prism/commit/0aa2363331

It gets confused for syntax introduced in https://bugs.ruby-lang.org/issues/20925
But it actually should be a plain method call.
`!`/`?` are not valid as part of an identifier, methods
however allow them as the last character.

Fixes [Bug #21946]

https://github.com/ruby/prism/commit/5d80bc5e1a

https://github.com/ruby/prism/commit/21c499d6e4

Redo of https://github.com/ruby/prism/pull/3669 with more tests

https://github.com/ruby/prism/commit/48b403ea79

https://github.com/ruby/prism/commit/138db9ccc4

https://github.com/ruby/prism/commit/609c80c91e