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Preview Ruby 4.1 is a preview. It can change before the final release. Switch to Ruby 4.0 →

instance method

Ripper#warning

(untyped fmt, *untyped args) -> untyped
warning(fmt, *args)

This method is called when strong warning is produced by the parser. fmt and args is printf style.

See also #warn #compile_error also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0