var golang.org/x/mod/zip.errSubmoduleDir

2 uses

	golang.org/x/mod/zip (current package)
		zip.go#L172: 	errSubmoduleDir  = errors.New("directory is in another module")
		zip.go#L753: 				omitted = append(omitted, FileError{Path: slashPath, Err: errSubmoduleDir})

The pages are generated with Golds v0.3.2-preview. (GOOS=darwin GOARCH=amd64)
Golds is a Go 101 project developed by Tapir Liu.
PR and bug reports are welcome and can be submitted to the issue list.
Please follow @Go100and1 (reachable from the left QR code) to get the latest news of Golds.