return n
}

// setPos walks the top structure of x that has no position assigned
// and assigns it all to have position pos.
// When setPos encounters a syntax node with a position assigned,
// setPos does not look inside that node.
// setPos only needs to handle syntax we create in this package;
// all other syntax should have positions assigned already.
func setPos(x syntax.Node, pos syntax.Pos) {
	if x == nil {

	for _, r := range entries {
		r := r.(*ir.KeyExpr)
		index, elem := r.Key, r.Value

		ir.SetPos(index)
		appendWalkStmt(init, ir.NewAssignStmt(base.Pos, tmpkey, index))

		ir.SetPos(elem)
		appendWalkStmt(init, ir.NewAssignStmt(base.Pos, tmpelem, elem))

		ir.SetPos(tmpelem)

		// typechecker rewrites OINDEX to OINDEXMAP

				}
				if len(nl)-i > 1 {
					goto toomany
				}
				n = nl[i]
				ir.SetPos(n)
				if n.Type() != nil {
					nl[i] = assignconvfn(n, t, desc)
				}
				return
			}

			// TODO(mdempsky): Make into ... call with implicit slice.
			for ; i < len(nl); i++ {
				n = nl[i]
				ir.SetPos(n)
				if n.Type() != nil {
					nl[i] = assignconvfn(n, t.Elem(), desc)
				}
			}

			n.SetType(nil)
			return n
		}
		n.SetType(t)
		n.SetOp(ir.OSLICESTR)
	} else if t.IsPtr() && t.Elem().IsArray() {
		tp = t.Elem()
		n.SetType(types.NewSlice(tp.Elem()))
		types.CalcSize(n.Type())
		if hasmax {
			n.SetOp(ir.OSLICE3ARR)
		} else {
			n.SetOp(ir.OSLICEARR)
		}
	} else if t.IsSlice() {
		n.SetType(t)
	} else {

		return true // discard
	}

	// Only worry about simple "l = r" assignments. The OAS2*
	// assignments mostly necessitate dynamic execution anyway.
	if len(lhs) > 1 {
		return false
	}

	lno := ir.SetPos(n)
	defer func() { base.Pos = lno }()

	nam := lhs[0].(*ir.Name)
	return s.StaticAssign(nam, 0, rhs, nam.Type())
}

// like staticassign but we are copying an already
// initialized value r.

		body.Append(ncase.Body...)
		if fall, pos := endsInFallthrough(ncase.Body); !fall {
			br := ir.NewBranchStmt(base.Pos, ir.OBREAK, nil)
			br.SetPos(pos)
			body.Append(br)
		}
	}
	sw.Cases = nil

	if defaultGoto == nil {
		br := ir.NewBranchStmt(base.Pos, ir.OBREAK, nil)
		br.SetPos(br.Pos().WithNotStmt())
		defaultGoto = br
	}

	s.Emit(&sw.Compiled)
	sw.Compiled.Append(defaultGoto)

	return &IdentifierNode{NodeType: NodeIdentifier, Ident: ident}
}

// SetPos sets the position. [NewIdentifier] is a public method so we can't modify its signature.
// Chained for convenience.
// TODO: fix one day?
func (i *IdentifierNode) SetPos(pos Pos) *IdentifierNode {
	i.Pos = pos
	return i
}

// SetTree sets the parent tree for the node. [NewIdentifier] is a public method so we can't modify its signature.

			// buffer during conversion. String comparison does not
			// memorize the strings for later use, so it is safe.
			if n.X.Op() == ir.OBYTES2STR {
				n.X.(*ir.ConvExpr).SetOp(ir.OBYTES2STRTMP)
			}
			if n.Y.Op() == ir.OBYTES2STR {
				n.Y.(*ir.ConvExpr).SetOp(ir.OBYTES2STRTMP)
			}

		case t.IsStruct() || t.IsArray():
			// for complex comparisons, we need both args to be

		r := rhs[0]

		switch r.Op() {
		case ir.OINDEXMAP:
			stmt.SetOp(ir.OAS2MAPR)
		case ir.ORECV:
			stmt.SetOp(ir.OAS2RECV)
		case ir.ODOTTYPE:
			r := r.(*ir.TypeAssertExpr)
			stmt.SetOp(ir.OAS2DOTTYPE)
			r.SetOp(ir.ODOTTYPE2)
		case ir.ODYNAMICDOTTYPE:
			r := r.(*ir.DynamicTypeAssertExpr)
			stmt.SetOp(ir.OAS2DOTTYPE)
			r.SetOp(ir.ODYNAMICDOTTYPE2)
		default:
			break assignOK
		}

	//	ha, hit: hidden aggregate, iterator
	//	hn, hp: hidden len, pointer
	//	hb: hidden bool
	//	a, v1, v2: not hidden aggregate, val 1, 2

	a := nrange.X
	t := a.Type()
	lno := ir.SetPos(a)

	v1, v2 := nrange.Key, nrange.Value

	if ir.IsBlank(v2) {
		v2 = nil
	}

	if ir.IsBlank(v1) && v2 == nil {
		v1 = nil
	}

	if v1 == nil && v2 != nil {