Issue #16923 has been reported by jeremyevans0 (Jeremy Evans).

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Feature #16923: Switch reserved for numbered parameter warning to SyntaxError
https://bugs.ruby-lang.org/issues/16923

* Author: jeremyevans0 (Jeremy Evans)
* Status: Open
* Priority: Normal
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I propose to make `_1 = 1` a SyntaxError, instead of emitting a warning (it emits a warning in 2.7).  I've implemented this proposal in a pull request: https://github.com/ruby/ruby/pull/3163



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