want := colbase + uint(i)

		f, err := Parse(nil, strings.NewReader(src), nil, nil, 0)
		if err != nil {
			t.Errorf("%s: %v", src, err)
			continue
		}

		// locate KeyValueExpr
		Inspect(f, func(n Node) bool {
			_, ok := n.(*KeyValueExpr)
			if ok {
				if got := StartPos(n).Col(); got != want {
					t.Errorf("%s: got col = %d, want %d", src, got, want)
				}
			}
			return !ok
		})
	}

		// expressions
		// case *BadExpr:
		// case *Name:
		// case *BasicLit:
		case *CompositeLit:
			if n.Type != nil {
				m = n.Type
				continue
			}
			return n.Pos()
		case *KeyValueExpr:
			m = n.Key
		// case *FuncLit:
		// case *ParenExpr:
		case *SelectorExpr:
			m = n.X
		case *IndexExpr:
			m = n.X
		// case *SliceExpr:
		case *AssertExpr:
			m = n.X
		case *TypeSwitchGuard:

			// (e.g., a duplicate field error doesn't need the struct type).
			fields := utyp.fields
			if _, ok := e.Elts[0].(*ast.KeyValueExpr); ok {
				// all elements must have keys
				visited := make([]bool, len(fields))
				for _, e := range e.Elts {
					kv, _ := e.(*ast.KeyValueExpr)
					if kv == nil {
						check.error(e, MixedStructLit, "mixture of field:value and value elements in struct literal")
						continue

			// (e.g., a duplicate field error doesn't need the struct type).
			fields := utyp.fields
			if _, ok := e.ElemList[0].(*syntax.KeyValueExpr); ok {
				// all elements must have keys
				visited := make([]bool, len(fields))
				for _, e := range e.ElemList {
					kv, _ := e.(*syntax.KeyValueExpr)
					if kv == nil {
						check.error(e, MixedStructLit, "mixture of field:value and value elements in struct literal")

		Walk(v, n.Fun)
		walkList(v, n.Args)

	case *StarExpr:
		Walk(v, n.X)

	case *UnaryExpr:
		Walk(v, n.X)

	case *BinaryExpr:
		Walk(v, n.X)
		Walk(v, n.Y)

	case *KeyValueExpr:
		Walk(v, n.Key)
		Walk(v, n.Value)

	// Types
	case *ArrayType:
		if n.Len != nil {
			Walk(v, n.Len)
		}
		Walk(v, n.Elt)

	case *StructType:
		Walk(v, n.Fields)

	}
}

// checkCopyLocksCompositeLit detects lock copy inside a composite literal
func checkCopyLocksCompositeLit(pass *analysis.Pass, cl *ast.CompositeLit) {
	for _, x := range cl.Elts {
		if node, ok := x.(*ast.KeyValueExpr); ok {
			x = node.Value
		}
		if path := lockPathRhs(pass, x); path != nil {
			pass.ReportRangef(x, "literal copies lock value from %v: %v", analysisutil.Format(pass.Fset, x), path)
		}
	}
}

func filterExprList(list []Expr, filter Filter, export bool) []Expr {
	j := 0
	for _, exp := range list {
		switch x := exp.(type) {
		case *CompositeLit:
			filterCompositeLit(x, filter, export)
		case *KeyValueExpr:
			if x, ok := x.Key.(*Ident); ok && !filter(x.Name) {
				continue
			}
			if x, ok := x.Value.(*CompositeLit); ok {
				filterCompositeLit(x, filter, export)
			}
		}
		list[j] = exp
		j++

			// (For an expression like fmt.Println, only add "fmt" to the
			// set of unresolved names, not "Println".)
			ast.Inspect(e.X, inspectFunc)
			return false
		case *ast.KeyValueExpr:
			// For key value expressions, only inspect the value
			// as the key should be resolved by the type of the
			// composite literal.
			ast.Inspect(e.Value, inspectFunc)
			return false
		}
		return true

	p.xnest++
	p.want(_Lbrace)
	x.Rbrace = p.list("composite literal", _Comma, _Rbrace, func() bool {
		// value
		e := p.bare_complitexpr()
		if p.tok == _Colon {
			// key ':' value
			l := new(KeyValueExpr)
			l.pos = p.pos()
			p.next()
			l.Key = e
			l.Value = p.bare_complitexpr()
			e = l
			x.NKeys++
		}
		x.ElemList = append(x.ElemList, e)
		return false
	})
	p.xnest--