var m uint = scanner.InsertSemis
	if mode&ParseComments != 0 {
		m |= scanner.ScanComments
	}
	return m
}

func (p *parser) init(fset *token.FileSet, filename string, src []byte, mode uint) {
	p.file = fset.AddFile(filename, fset.Base(), len(src))
	p.scanner.Init(p.file, src, p, scannerMode(mode))

	p.mode = mode
	p.trace = mode&Trace != 0 // for convenience (p.trace is used frequently)

	p.next()

	// nestLev is used to track and limit the recursion depth
	// during parsing.
	nestLev int
}

func (p *parser) init(fset *token.FileSet, filename string, src []byte, mode Mode) {
	p.file = fset.AddFile(filename, -1, len(src))
	eh := func(pos token.Position, msg string) { p.errors.Add(pos, msg) }
	p.scanner.Init(p.file, src, eh, scanner.ScanComments)

	p.top = true
	p.mode = mode