[perl #124368] Perl_sv_2pv_flags: Assertion`((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags &0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed

Triggered in Perl v5.25.5-8-g3c42ae1 with the following:

./perl -e '$0=s0::;chop@0=~y:::'
sv.c:2928: char *Perl_sv_2pv_flags(SV *const, STRLEN *const, const I32): Assertion `((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed.
Aborted

• [perl #124368] Perl_sv_2pv_flags: Assertion`((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags &0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Brian Carpenter via RT