Feature #20291: Add --warning=category option the same as -W:category

• Status: Open
• Assignee: -
• Target version: -

[nobu (Nobuyoshi Nakada)]

I propose a --warning option that corresponds to the -W option, like the --encoding option to the -E option.
The argument after --warning= is same as -W:.

https://github.com/ruby/ruby/pull/4113

Hello, what's the rationale?