const go/parser.ImportsOnly

3 uses

	go/parser (current package)
		interface.go#L51: 	ImportsOnly                                       // stop parsing after import declarations
		parser.go#L2887: 		if p.mode&ImportsOnly == 0 {

	go/build
		read.go#L453: 	info.parsed, info.parseErr = parser.ParseFile(info.fset, info.name, info.header, parser.ImportsOnly|parser.ParseComments)