Building the simplest Go static analysis tool

Filippo Valsorda introduces "Go native vendoring" (GO15VENDOREXPERIMENT), a method to freeze dependencies by placing them in a vendor folder within a project. The compiler then checks the vendor folder before searching the GOPATH. However, users might forget to vendor certain packages, causing issues when sharing the program with others. To address this, Valsorda developed a simple static analysis tool using Go's simplicity and libraries. The tool loads packages passed as arguments on the command line, including test files based on a flag, and checks if all non-standard library dependencies are vendored. It can be found at https://github.com/FiloSottile/vendorcheck.