Bug #15437: 正規表現の名前付きキャプチャでASCII以外の大文字で定義したクラスが上書きされる

• Status: Closed
• Assignee: -
• Target version: 2.6
• ruby -v: ruby 2.6.0rc2 (2018-12-15 trunk 66408) [x86_64-linux]
• Backport: 2.4: DONTNEED, 2.5: DONTNEED

[hanachin (Seiei Miyagi)]

ASCIIの大文字で定義したクラスは正規表現の名前付きキャプチャで上書きされませんが、ASCII以外の大文字で定義したクラスは上書きされてしまうようです。
これは意図的ですか？

# rewrite_constant_by_named_capture.rb
class C
end

/(?<C>C)/ =~ "C"

p C

class 𝐂
end

/(?<𝐂>𝐂)/ =~ "𝐂"

p 𝐂

C.new
𝐂.new

% ruby -v rewrite_constant_by_named_capture.rb
ruby 2.6.0rc2 (2018-12-15 trunk 66408) [x86_64-linux]
C
rewrite_constant_by_named_capture.rb:11: warning: already initialized constant 𝐂
rewrite_constant_by_named_capture.rb:8: warning: previous definition of 𝐂 was here
"𝐂"
Traceback (most recent call last):
rewrite_constant_by_named_capture.rb:16:in `<main>': undefined method `new' for "𝐂":String (NoMethodError)
Did you mean?  next

[naruse (Yui NARUSE)]

• Target version set to 2.6
• Backport changed from 2.4: UNKNOWN, 2.5: UNKNOWN to 2.4: DONTNEED, 2.5: DONTNEED

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r66463.

---

parse.y: ignore constant name captures

• parse.y (reg_named_capture_assign_iter): ignore non-local name
  captures, including non-ASCII constant names.
  [ruby-dev:50719] [Bug #15437]

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)