Bug #13798: Strange "invalid subexp call" warning happens inside of comment

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.5.0dev (2017-08-10 trunk 59556) [x86_64-darwin15]
• Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN

[shyouhei (Shyouhei Urabe)]

Attached script renders "invalid subexp call" warning.

zsh % ruby warn.rb
warn.rb:4: warning: invalid subexp call

This is strange in several ways:

• The warning is triggered by Regexp#to_s, not by the compilation.
• There is no such thing like a subexp call in the regular expression.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r59574.

---

re.c: options for sub-regexp

• re.c (rb_reg_to_s): needs embedded options to check syntax of
  sub-regexp. [ruby-core:82328] [Bug #13798]