n.Ptr = walkExpr(n.Ptr, init)
	n.Len = walkExpr(n.Len, init)
	n.Cap = walkExpr(n.Cap, init)
	return n
}

// walkStringHeader walks an OSTRINGHEADER node.
func walkStringHeader(n *ir.StringHeaderExpr, init *ir.Nodes) ir.Node {
	n.Ptr = walkExpr(n.Ptr, init)
	n.Len = walkExpr(n.Len, init)
	return n
}

// return 1 if integer n must be in range [0, max), 0 otherwise.

	}

	var init ir.Nodes

	call := n.Call.(*ir.CallExpr)
	call.Fun = walkExpr(call.Fun, &init)

	if len(init) > 0 {
		init.Append(n)
		return ir.NewBlockStmt(n.Pos(), init)
	}
	return n
}

// walkIf walks an OIF node.
func walkIf(n *ir.IfStmt) ir.Node {
	n.Cond = walkExpr(n.Cond, n.PtrInit())
	walkStmtList(n.Body)
	walkStmtList(n.Else)
	return n

	return mkcall("gorecover", nn.Type(), init, walkExpr(nn.Args[0], init))
}

// walkUnsafeData walks an OUNSAFESLICEDATA or OUNSAFESTRINGDATA expression.
func walkUnsafeData(n *ir.UnaryExpr, init *ir.Nodes) ir.Node {
	slice := walkExpr(n.X, init)
	res := typecheck.Expr(ir.NewUnaryExpr(n.Pos(), ir.OSPTR, slice))
	res.SetType(n.Type())
	return walkExpr(res, init)
}

	if ir.IsBlank(a) {
		return walkExpr(typecheck.Stmt(n), init)
	}

	var_ := typecheck.TempAt(base.Pos, ir.CurFunc, types.NewPtr(t.Elem()))
	var_.SetTypecheck(1)
	var_.MarkNonNil() // mapaccess always returns a non-nil pointer

	n.Lhs[0] = var_
	init.Append(walkExpr(n, init))

	as := ir.NewAssignStmt(base.Pos, a, ir.NewStarExpr(base.Pos, var_))
	return walkExpr(typecheck.Stmt(as), init)
}

	}
}

// walkRecv walks an ORECV node.
func walkRecv(n *ir.UnaryExpr) ir.Node {
	if n.Typecheck() == 0 {
		base.Fatalf("missing typecheck: %+v", n)
	}
	init := ir.TakeInit(n)

	n.X = walkExpr(n.X, &init)
	call := walkExpr(mkcall1(chanfn("chanrecv1", 2, n.X.Type()), nil, &init, n.X, typecheck.NodNil()), &init)
	return ir.InitExpr(init, call)
}

func convas(n *ir.AssignStmt, init *ir.Nodes) *ir.AssignStmt {

// compile

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Issue 8154: cmd/5g: ICE in walkexpr walk.c

package main

func main() {
	c := make(chan int)
	_ = [1][]func(){[]func(){func() { <-c }}}

	if x := clo.Prealloc; x != nil {
		if !types.Identical(typ, x.Type()) {
			panic("closure type does not match order's assigned type")
		}
		addr.Prealloc = x
		clo.Prealloc = nil
	}

	return walkExpr(cfn, init)
}

// closureArgs returns a slice of expressions that can be used to
// initialize the given closure's free variables. These correspond
// one-to-one with the variables in clo.Func.ClosureVars, and will be

	"cmd/compile/internal/typecheck"
	"cmd/compile/internal/types"
	"cmd/internal/sys"
)

// walkConv walks an OCONV or OCONVNOP (but not OCONVIFACE) node.
func walkConv(n *ir.ConvExpr, init *ir.Nodes) ir.Node {
	n.X = walkExpr(n.X, init)
	if n.Op() == ir.OCONVNOP && n.Type() == n.X.Type() {
		return n.X
	}
	if n.Op() == ir.OCONVNOP && ir.ShouldCheckPtr(ir.CurFunc, 1) {

		return walkCompareInterface(n, init)
	}

	if n.X.Type().IsString() && n.Y.Type().IsString() {
		return walkCompareString(n, init)
	}

	n.X = walkExpr(n.X, init)
	n.Y = walkExpr(n.Y, init)

	// Given mixed interface/concrete comparison,
	// rewrite into types-equal && data-equal.
	// This is efficient, avoids allocations, and avoids runtime calls.
	//

	// use a zero-cost alias of the byte slice.
	// Do this before calling walkExpr on cond,
	// because walkExpr will lower the string
	// conversion into a runtime call.
	// See issue 24937 for more discussion.
	if cond.Op() == ir.OBYTES2STR && allCaseExprsAreSideEffectFree(sw) {
		cond := cond.(*ir.ConvExpr)
		cond.SetOp(ir.OBYTES2STRTMP)
	}

	cond = walkExpr(cond, sw.PtrInit())
	if cond.Op() != ir.OLITERAL && cond.Op() != ir.ONIL {