base.FatalfAt(pos, "misuse of method type: %v", typ)
	}
	types.CalcSize(typ)

	sym := &types.Sym{
		Name: autotmpname(len(curfn.Dcl)),
		Pkg:  types.LocalPkg,
	}
	name := curfn.NewLocal(pos, sym, typ)
	name.SetEsc(ir.EscNever)
	name.SetUsed(true)
	name.SetAutoTemp(true)

	return name
}

var (
	autotmpnamesmu sync.Mutex
	autotmpnames   []string
)