From: kevin.deisz@... Date: 2020-02-18T16:03:02+00:00 Subject: [ruby-core:97192] [Ruby master Bug#16640] Symbol#to_proc has incorrect arity Issue #16640 has been updated by kddeisz (Kevin Deisz). To add some context, this came up because of https://github.com/rails/rails/pull/38474 - specifically https://github.com/rails/rails/blob/2fa1f7c48151617e13b4ad6ca065e47c8d7b42d0/activesupport/lib/active_support/callbacks.rb#L460-L461. The idea being that it's checking the arity to determine what kind of callback to build, but because Symbol#to_proc says it's -1, it actually results in an error. ---------------------------------------- Bug #16640: Symbol#to_proc has incorrect arity https://bugs.ruby-lang.org/issues/16640#change-84299 * Author: kddeisz (Kevin Deisz) * Status: Open * Priority: Normal * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN ---------------------------------------- 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. -- https://bugs.ruby-lang.org/ Unsubscribe: