From @geeknik

While fuzzing Perl v5.23.9 (v5.23.8-11-g71dfb35) with American Fuzzy Lop, I found a script that triggers an assertion failure​:

~/perl/perl -e '0,qr{(}'
perl​: regcomp.c​:10187​: S_reg​: Assertion `(pRExC_state->parse) < (pRExC_state->end)' failed.

In contrast, Perl v5.20.2 throws the following​:
Unmatched ( in regex; marked by <-- HERE in m/( <-- HERE / at -e line 1.

@khwilliamson - Status changed from 'new' to 'open'

From @khwilliamson

Fixed by commit 77eddfe
--
Karl Williamson

@khwilliamson - Status changed from 'open' to 'pending release'

From @khwilliamson

Thank you for submitting this report. You have helped make Perl better.
 
With the release of Perl 5.24.0 on May 9, 2016, this and 149 other issues have been resolved.

Perl 5.24.0 may be downloaded via https://metacpan.org/release/RJBS/perl-5.24.0

@khwilliamson - Status changed from 'pending release' to 'resolved'