Regex Diagnostic Clarified

# New Ticket Created by  "jason richmond" 
# Please include the string:  [perl #46507]
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This is perl, v5.8.8 built for i486-linux-gnu-thread-multi
the code

perl -lwe 'my $m=0; s/(?{local $m})//'

returns

'panic: top_env'

This is a pretty confusing. I would recomend the diag should
be
changed to "Illegal Localization within
subroutine"

That is if it is in fact crashing because of that. I have
been proven
wrong before.