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                                    }
                                }

                              if (CvCONST (sv) && (SV*)CvXSUBANY (sv).any_ptr == targ)
                                res_pair ("the constant value of");

                              if (!CvWEAKOUTSIDE (sv) && (SV*)CvOUTSIDE (sv) == targ)
                                res_pair ("the containing scope for");

                              if (sv == targ && CvANON (sv))
                                if (CvSTART (sv)
                                    && CvSTART (sv)->op_type == OP_NEXTSTATE
                                    && CopLINE ((COP *)CvSTART (sv)))
                                  res_text (form ("the closure created at %s:%d",
                                                  CopFILE ((COP *)CvSTART (sv)) ? CopFILE ((COP *)CvSTART (sv)) : "<unknown>",
                                                  CopLINE ((COP *)CvSTART (sv))));
                                else
                                  res_text (form ("the closure created somewhere in file %s (PLEASE REPORT!)",
                                                  CvFILE (sv) ? CvFILE (sv) : "<unknown>"));
                            }

                            break;

                          case SVt_PVGV:
                            if (GvGP (sv))
                              {
                                if (GvSV (sv) == (SV *)targ) res_gv ('$');
                                if (GvAV (sv) == (AV *)targ) res_gv ('@');
                                if (GvHV (sv) == (HV *)targ) res_gv ('%');
                                if (GvCV (sv) == (CV *)targ) res_gv ('&');
                              }

                            break;

                          case SVt_PVLV:
                            if (LvTARG (sv) == targ)
                              {
                                if (LvTYPE (sv) == 'y')
                                  {
                                    MAGIC *mg = mg_find (sv, PERL_MAGIC_defelem);

                                    if (mg && mg->mg_obj)
                                      res_pair (form ("the target for the lvalue hash element '%.*s',",
                                                      (int)SvCUR (mg->mg_obj), SvPV_nolen (mg->mg_obj)));
                                    else
                                      res_pair (form ("the target for the lvalue array element #%d,", LvTARGOFF (sv)));
                                  }
                                else
                                  res_pair (form ("an lvalue reference target (type '%c', ofs %d, len %d),",
                                                  LvTYPE (sv), LvTARGOFF (sv), LvTARGLEN (sv)));
                              }

                            break;
                        }

                    if (rmagical)
                      SvRMAGICAL_on (sv);
                  }
              }

            /* look at the mortalise stack of the current coroutine */
            for (i = 0; i <= PL_tmps_ix; ++i)
              if (PL_tmps_stack [i] == targ)
                res_text ("a temporary on the stack");

            if (targ == (SV*)PL_main_cv)
              res_text ("the main body of the program");
          }

        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newRV_noinc ((SV *)about)));
        PUSHs (sv_2mortal (newRV_noinc ((SV *)excl)));
}

SV *
ptr2ref (UV ptr)
	CODE:
        RETVAL = newRV_inc (INT2PTR (SV *, ptr));
	OUTPUT:
        RETVAL

UV
ref2ptr (SV *rv)
	CODE:
        if (!SvROK (rv))
	  croak ("argument to Devel::FindRef::ref2ptr must be a reference");
        RETVAL = PTR2UV (SvRV (rv));
	OUTPUT:
        RETVAL

U32
_refcnt (SV *rv)
	CODE:
        if (!SvROK (rv))
	  croak ("argument to Devel::FindRef::_refcnt must be a reference");
        RETVAL = SvREFCNT (SvRV (rv));
	OUTPUT:
        RETVAL