From: eregontp@...
Date: 2020-02-21T09:34:03+00:00
Subject: [ruby-core:97227] [Ruby master Bug#16640] Symbol#to_proc reports -1	for arity

Issue #16640 has been updated by Eregon (Benoit Daloze).


The arity should actually be `-2` which means 1 required arguments + any number of optional arguments.

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Bug #16640: Symbol#to_proc reports -1 for arity
https://bugs.ruby-lang.org/issues/16640#change-84337

* Author: kddeisz (Kevin Deisz)
* Status: Rejected
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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When you create a proc using `Symbol#to_proc` syntax, it reports the arity as -1, even though the required number of arguments is actually 1. This can happen based on `lambda(&:hash)`, `proc(&:hash)`, or `some_method(&:hash)`. Opened a PR with a fix here: https://github.com/ruby/ruby/pull/2913.



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