Bug #18988: Ripper cannot parse some code that has regexp named capture

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 3.2.0dev (2022-08-29T15:47:09Z :detached: cd7506593a) [x86_64-linux]
• Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN

[tompng (tomoya ishida)]

Ripper does not seems to recognize regexp named capture defining new local variables, fails to parse some code.

requie 'ripper'

# expect syntax ok, got syntax error
Ripper.sexp("/(?<a>)/ =~ ''; x = a **a, a if false")

# expect syntax error, got syntax ok
Ripper.sexp("/(?<a>)/ =~ ''; x = a **a, **a if false")

# "exit" is a method call, got string_literal
Ripper.sexp("/(?<a>)/ =~ ''; a %(exit)")

[tompng (tomoya ishida)]

• Subject changed from # Ripper cannot parse some code that has regexp named capture to Ripper cannot parse some code that has regexp named capture

[jeremyevans0 (Jeremy Evans)]

It appears that YARP parses all of these correctly:

YARP.parse("/(?<a>)/ =~ ''; x = a **a, a if false").success?
=> true    
  
YARP.parse("/(?<a>)/ =~ ''; x = a **a, **a if false").success?       
=> false    

YARP.parse("/(?<a>)/ =~ ''; a %(exit)")
# includes: ([CallNode(20...24)(nil, nil, (20...24), nil, nil, nil, nil, 2, "exit")])

[yui-knk (Kaneko Yuichiro)]

• Status changed from Open to Closed

This is solved by https://bugs.ruby-lang.org/issues/20257 (https://github.com/ruby/ruby/pull/9923).