const go/types._UnusedImport

3 uses

	go/types (current package)
		errorcodes.go#L80: 	_UnusedImport
		resolver.go#L705: 		check.softErrorf(obj, _UnusedImport, "%q imported but not used", path)
		resolver.go#L707: 		check.softErrorf(obj, _UnusedImport, "%q imported but not used as %s", path, obj.name)