Issue #20979 has been reported by znz (Kazuhiro NISHIYAMA). ---------------------------------------- Bug #20979: +comment does not affect parsetree without `--parser=parse.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 [arm64-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=parse.y`. If it is intentional, I think more help messages or more explanation somewhere. ``` 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 =(ruby --dump=parsetree -e 0) =(ruby --dump=parsetree+comment -e 0) % git diff --no-index --stat =(ruby --parser=parse.y --dump=parsetree -e 0) =(ruby --parser=parse.y --dump=parsetree+comment -e 0) /tmp/{zshEGciGv => zshWgqfVT} | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) ``` -- https://bugs.ruby-lang.org/