[ruby-core:120378] [Ruby master Bug#20979] +comment does not affect parsetree without `--parser=parse.y`

Issue #20979 has been reported by znz (Kazuhiro NISHIYAMA).

----------------------------------------
Bug #20979: +comment does not affect parsetree without `--parser=3Dparse.y`
https://bugs.ruby-lang.org/issues/20979

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Target version: 3.4
* ruby -v: ruby 3.4.0dev (2024-12-23T02:52:14Z master b19fcd02fa) +PRISM [a=
rm64-darwin24]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
`ruby --help` says `+comment        Add comments to AST (affects parsetree)=
.`, but it does not affect without `--parser=3Dparse.y`.

If it is intentional, I think more help messages or more explanation somewh=
ere.
=A0
```
Dump List:
  insns           Instruction sequences.
  yydebug         yydebug of yacc parser generator.
  parsetree       Abstract syntax tree (AST).
  -optimize       Disable optimization (affects insns).
  +error-tolerant Error-tolerant parsing (affects yydebug, parsetree).
  +comment        Add comments to AST (affects parsetree).
```

```
% git diff --no-index --stat =3D(ruby --dump=3Dparsetree -e 0) =3D(ruby --d=
ump=3Dparsetree+comment -e 0)
% git diff --no-index --stat =3D(ruby --parser=3Dparse.y --dump=3Dparsetree=
 -e 0) =3D(ruby --parser=3Dparse.y --dump=3Dparsetree+comment -e 0)
 /tmp/{zshEGciGv =3D> zshWgqfVT} | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)
```



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