Issue #15786 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.4: REQUIRED, 2.5: REQUIRED, 2.6: DONE to 2.4: REQUIRED, 2.5: DONE, 2.6: DONE

ruby_2_5 r67758 merged revision(s) d0ba4abf1a00339ebbb5d405db3240a8bdb7b68b,54eac83b2ad77ddea84fa6d66c09e0bb014cf61e.

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Bug #15786: numbered parameterを使ったprocのparametersに記号が現れる
https://bugs.ruby-lang.org/issues/15786#change-81024

* Author: tompng (tomoya ishida)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-04-23 trunk f4f66bd11c) [x86_64-darwin17]
* Backport: 2.4: REQUIRED, 2.5: DONE, 2.6: DONE
----------------------------------------
~~~ruby
->{@100}.parameters.map{@2}.join
#=> "!\"\#$%&'()*+,-./:;<=>?@[\\]^`"
~~~

`proc{@100}.parameters` の場合はそれに加え、`[[:opt, nil]...]` になる

`RubyVM::InstructionSequence.of(->{@100}).to_a`
`RubyVM::InstructionSequence.disasm(->{@100})`
にも同様の記号が混ざる

`lambda{@100}.parameters` は `[[:req]]*100`
`proc{@100}.parameters` は `[[:opt, nil]]*100`ではなく`[[:opt]]*100`
になると良いのではないかと思います。(`1.method(:+).parameters #=> [[:req]]` とnilは含まれないのでそれに合わせて)




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