each of which can match any string, including the empty string and
strings containing slashes. Such a pattern expands to all package
directories found in the GOPATH trees with names matching the
-patterns. For example, encoding/... expands to all packages
-in the encoding tree.
+patterns. For example, encoding/... expands to all package
+in subdirectories of the encoding tree, while net... expands to
+net and all its subdirectories.
An import path can also name a package to be downloaded from
a remote repository. Run 'go help remote' for details.