func tcCheckNil(n *ir.UnaryExpr) ir.Node {
	n.X = Expr(n.X)
	if !n.X.Type().IsPtrShaped() {
		base.FatalfAt(n.Pos(), "%L is not pointer shaped", n.X)
	}
	return n
}

// tcFor typechecks an OFOR node.
func tcFor(n *ir.ForStmt) ir.Node {
	Stmts(n.Init())
	n.Cond = Expr(n.Cond)
	n.Cond = DefaultLit(n.Cond, nil)
	if n.Cond != nil {
		t := n.Cond.Type()
		if t != nil && !t.IsBoolean() {

			n = ir.NewBlockStmt(n.Pos(), nil)
		}
		return n

	case ir.ODEFER, ir.OGO:
		n := n.(*ir.GoDeferStmt)
		n.Call = typecheck(n.Call, ctxStmt|ctxExpr)
		tcGoDefer(n)
		return n

	case ir.OFOR:
		n := n.(*ir.ForStmt)
		return tcFor(n)

	case ir.OIF:
		n := n.(*ir.IfStmt)
		return tcIf(n)

	case ir.ORETURN:
		n := n.(*ir.ReturnStmt)
		return tcReturn(n)

	case ir.OTAILCALL:

		o.out = append(o.out, n)
		o.popTemp(t)

	// Clean temporaries from condition evaluation at
	// beginning of loop body and after for statement.
	case ir.OFOR:
		n := n.(*ir.ForStmt)
		t := o.markTemp()
		n.Cond = o.exprInPlace(n.Cond)
		orderBlock(&n.Body, o.free)
		n.Post = orderStmtInPlace(n.Post, o.free)
		o.out = append(o.out, n)
		o.popTemp(t)

			case ir.OBREAK:
				to = lab.breakTarget
			}
		}

		b := s.endBlock()
		b.Pos = s.lastPos.WithIsStmt() // Do this even if b is an empty block.
		b.AddEdgeTo(to)

	case ir.OFOR:
		// OFOR: for Ninit; Left; Right { Nbody }
		// cond (Left); body (Nbody); incr (Right)
		n := n.(*ir.ForStmt)
		base.Assert(!n.DistinctVars) // Should all be rewritten before escape analysis

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// Acorn Labs : https://acorn.io
// Submitted by Craig Jellick <******@****.***>
*.on-acorn.io

// ActiveTrail: https://www.activetrail.biz/
// Submitted by Ofer Kalaora <******@****.***>
activetrail.biz

// Adobe : https://www.adobe.com/
// Submitted by Ian Boston <******@****.***> and Lars Trieloff <******@****.***>
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