needsUnsafe := false
	f.walk(arg, ctxExpr, func(f *File, arg interface{}, context astContext) {
		px, ok := arg.(*ast.Expr)
		if !ok {
			return
		}
		sel, ok := (*px).(*ast.SelectorExpr)
		if ok {
			if l, ok := sel.X.(*ast.Ident); !ok || l.Name != "C" {
				return
			}

			for _, r := range f.Ref {
				if r.Expr == px {
					*px = p.rewriteName(f, r, addPosition)

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ra?t&n?opsgolb,?www?ysrab,?e&a!.&a&ac?cgd?idem??bulc!orea??ci&ffartria?taborea??e&c&alptekram?n&a&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?en...