_Bool S_sprintf_is_multiconcatable(): Assertion `!(o->op_flags & OPf_STACKED)' failed (op.c:2533)

[p5pRT]

Migrated from rt.perl.org#133137 (status was 'open')

Searchable as RT133137$

[p5pRT]

From @geeknik

This assert was triggered with Perl v5.27.10-134-g2407a17ad5.

./perl -e '0/v$0sprintf$0$0'

Scalar found where operator expected at -e line 1, near "$0$0"
  (Missing operator before $0?)
perl​: op.c​:2533​: _Bool S_sprintf_is_multiconcatable(OP *, struct
sprintf_ismc_info *)​: Assertion `!(o->op_flags & OPf_STACKED)' failed.
Aborted

[p5pRT]

From @iabyn

On Fri, Apr 20, 2018 at 05​:43​:50PM -0700, Brian Carpenter wrote​:

# New Ticket Created by Brian Carpenter
# Please include the string​: [perl #133137]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl5/Ticket/Display.html?id=133137 >

This assert was triggered with Perl v5.27.10-134-g2407a17ad5.

./perl -e '0/v$0sprintf$0$0'

Scalar found where operator expected at -e line 1, near "$0$0"
(Missing operator before $0?)
perl​: op.c​:2533​: _Bool S_sprintf_is_multiconcatable(OP *, struct
sprintf_ismc_info *)​: Assertion `!(o->op_flags & OPf_STACKED)' failed.
Aborted

I think this comes under the category of 'we shouldn't continue parsing
when we've encountered a syntax error', which I intend to do sometime in
5.29.

--
Music lesson​: a symbiotic relationship whereby a pupil's embellishments
concerning the amount of practice performed since the last lesson are
rewarded with embellishments from the teacher concerning the pupil's
progress over the corresponding period.

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'

[geeknik]

This flaw still impacts perl v5.33.6 (v5.33.5-57-g3e793456f2).