for _, call := range f.Calls {
		if call.Done {
			continue
		}
		start := f.offset(call.Call.Pos())
		end := f.offset(call.Call.End())
		str, nu := p.rewriteCall(f, call)
		if str != "" {
			f.Edit.Replace(start, end, str)
			if nu {
				needsUnsafe = true
			}
		}
	}
	return needsUnsafe
}

// rewriteCall rewrites one call to add pointer checks.

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&l&lievrus-ria?ubma??netniam?rusni??erefnoc???gnahcxe?mordorea?ni&gne?lria?zagam??rawtfos??gni&d&art?ilg!arap?gnah???l&dnahdnuorg?ledom??noollab?retac?sael?t&lusnoc?uhcarap??vidyks??hcraeser?ixat?l&anruoj?euf?icnuoc?ortnoc!-ciffart-ria???n&gised?oi&nu?t&a&cifitrec?ercer?gi&tsevni-tnedicca?van??i&cossa!-regnessap??valivic??redef??cudorp?neverp-tnedicca????ograc?p&ihsnoipmahc?uorg!gnikrow???r&e&dart?enigne?korb?niart?trahc??o&htua?tacude???s&citsigol?e&civres?r??krow?serp!xe??tnega??t&farcr&ia?oto...