in reply to Re^5: ref to read-only alias ... why? (notabug)
in thread ref to read-only alias ... why?
I agree on a warning, it would be a practical thing, after all. And after that, a real fix with 'die' a couple versions later should help the legacy code.
Well anyway, I found the code suggested by ikegami, so would you guys review the patch please?
--- pp.c.0 2012-01-06 01:07:34.511988700 +0100 +++ pp.c 2012-01-06 19:04:06.311428300 +0100 @@ -515,9 +515,11 @@ SvTEMP_off(sv); SvREFCNT_inc_void_NN(sv); } - else if (SvPADTMP(sv) && !IS_PADGV(sv)) + else if (SvPADTMP(sv) && !IS_PADGV(sv)) { + Perl_ck_warner(aTHX_ packWARN(WARN_MISC), + "Implicit copy of a read-only scalar due to aliasing"); sv = newSVsv(sv); - else { + } else { SvTEMP_off(sv); SvREFCNT_inc_void_NN(sv); }
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