[ruby-core:116592] [Ruby master Feature#20235] Deprecate CHAR syntax

Issue #20235 has been updated by nobu (Nobuyoshi Nakada).


Maybe want to parse `closed?=>true` as `(closed?)=>true`?
If only it is, `?c` syntax doesn't feel to need to be removed.

----------------------------------------
Feature #20235: Deprecate CHAR syntax
https://bugs.ruby-lang.org/issues/20235#change-106605

* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
----------------------------------------
I propose deprecating the `?c` syntax. It served a purpose in ruby <= 1.8, but no longer.

The reason I'm proposing this is because today I ran into this error:
```ruby
p $stdin.closed?=>true # comparison of String with true failed (ArgumentError)
```
I was completed mystified, and had to resort to Ripper to figure out what's going on
```
p *Ripper.lex("p $stdin.closed?=>true")
[[1, 0], :on_ident, "p", CMDARG]
[[1, 1], :on_sp, " ", CMDARG]
[[1, 2], :on_gvar, "$stdin", END]
[[1, 8], :on_period, ".", DOT]
[[1, 9], :on_ident, "closed", ARG]
[[1, 15], :on_CHAR, "?=", END]  #OOOOHH!!!!!
[[1, 17], :on_op, ">", BEG]
[[1, 18], :on_kw, "true", END]
```

We don't have to commit to a removal schedule right now, but I think it would at least be good to print a deprecation message if $VERBOSE.



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