// (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")

		// generated code - simply ignore the size in this case by setting
		// it to 0).
		prevSize := size
		const infinity = 1e6 // larger than any source line
		size = p.nodeSize(x, infinity)
		pair, isPair := x.(*ast.KeyValueExpr)
		if size <= infinity && prev.IsValid() && next.IsValid() {
			// x fits on a single line
			if isPair {
				size = p.nodeSize(pair.Key, infinity) // size <= infinity
			}
		} else {

		return p.parseLiteralValue(nil)
	}

	x := p.parseExpr(keyOk) // don't resolve if map key
	if keyOk {
		if p.tok == token.COLON {
			colon := p.pos
			p.next()
			return &ast.KeyValueExpr{x, colon, p.parseElement(false)}
		}
		p.resolve(x) // not a map key
	}

	return x
}

func (p *parser) parseElementList() (list []ast.Expr) {
	if p.trace {

	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--

func (p *parser) parseElement() ast.Expr {
	if p.trace {
		defer un(trace(p, "Element"))
	}

	x := p.parseValue()
	if p.tok == token.COLON {
		colon := p.pos
		p.next()
		x = &ast.KeyValueExpr{Key: x, Colon: colon, Value: p.parseValue()}
	}

	return x
}

func (p *parser) parseElementList() (list []ast.Expr) {
	if p.trace {
		defer un(trace(p, "ElementList"))
	}