// The commands are:
//
// build compile packages and dependencies
+// bug start a bug report
// clean remove object files and cached files
// doc show documentation for package or symbol
// env print Go environment information
-// bug start a bug report
// fix update packages to use new APIs
// fmt gofmt (reformat) package sources
// generate generate Go files by processing source
//
// Additional help topics:
//
-// c calling between Go and C
// buildmode build modes
+// c calling between Go and C
// cache build and test caching
+// environment environment variables
// filetype file types
// gopath GOPATH environment variable
-// environment environment variables
// importpath import path syntax
// packages package lists
// testflag testing flags
// See also: go install, go get, go clean.
//
//
+// Start a bug report
+//
+// Usage:
+//
+// go bug
+//
+// Bug opens the default browser and starts a new bug report.
+// The report includes useful system information.
+//
+//
// Remove object files and cached files
//
// Usage:
// For more about environment variables, see 'go help environment'.
//
//
-// Start a bug report
-//
-// Usage:
-//
-// go bug
-//
-// Bug opens the default browser and starts a new bug report.
-// The report includes useful system information.
-//
-//
// Update packages to use new APIs
//
// Usage:
// See also: go fmt, go fix.
//
//
-// Calling between Go and C
-//
-// There are two different ways to call between Go and C/C++ code.
-//
-// The first is the cgo tool, which is part of the Go distribution. For
-// information on how to use it see the cgo documentation (go doc cmd/cgo).
-//
-// The second is the SWIG program, which is a general tool for
-// interfacing between languages. For information on SWIG see
-// http://swig.org/. When running go build, any file with a .swig
-// extension will be passed to SWIG. Any file with a .swigcxx extension
-// will be passed to SWIG with the -c++ option.
-//
-// When either cgo or SWIG is used, go build will pass any .c, .m, .s,
-// or .S files to the C compiler, and any .cc, .cpp, .cxx files to the C++
-// compiler. The CC or CXX environment variables may be set to determine
-// the C or C++ compiler, respectively, to use.
-//
-//
// Build modes
//
// The 'go build' and 'go install' commands take a -buildmode argument which
// import, into a Go plugin. Packages not named main are ignored.
//
//
+// Calling between Go and C
+//
+// There are two different ways to call between Go and C/C++ code.
+//
+// The first is the cgo tool, which is part of the Go distribution. For
+// information on how to use it see the cgo documentation (go doc cmd/cgo).
+//
+// The second is the SWIG program, which is a general tool for
+// interfacing between languages. For information on SWIG see
+// http://swig.org/. When running go build, any file with a .swig
+// extension will be passed to SWIG. Any file with a .swigcxx extension
+// will be passed to SWIG with the -c++ option.
+//
+// When either cgo or SWIG is used, go build will pass any .c, .m, .s,
+// or .S files to the C compiler, and any .cc, .cpp, .cxx files to the C++
+// compiler. The CC or CXX environment variables may be set to determine
+// the C or C++ compiler, respectively, to use.
+//
+//
// Build and test caching
//
// The go command caches build outputs for reuse in future builds.
// decisions about whether to reuse a cached test result.
//
//
+// Environment variables
+//
+// The go command, and the tools it invokes, examine a few different
+// environment variables. For many of these, you can see the default
+// value of on your system by running 'go env NAME', where NAME is the
+// name of the variable.
+//
+// General-purpose environment variables:
+//
+// GCCGO
+// The gccgo command to run for 'go build -compiler=gccgo'.
+// GOARCH
+// The architecture, or processor, for which to compile code.
+// Examples are amd64, 386, arm, ppc64.
+// GOBIN
+// The directory where 'go install' will install a command.
+// GOOS
+// The operating system for which to compile code.
+// Examples are linux, darwin, windows, netbsd.
+// GOPATH
+// For more details see: 'go help gopath'.
+// GORACE
+// Options for the race detector.
+// See https://golang.org/doc/articles/race_detector.html.
+// GOROOT
+// The root of the go tree.
+// GOTMPDIR
+// The directory where the go command will write
+// temporary source files, packages, and binaries.
+// GOCACHE
+// The directory where the go command will store
+// cached information for reuse in future builds.
+//
+// Environment variables for use with cgo:
+//
+// CC
+// The command to use to compile C code.
+// CGO_ENABLED
+// Whether the cgo command is supported. Either 0 or 1.
+// CGO_CFLAGS
+// Flags that cgo will pass to the compiler when compiling
+// C code.
+// CGO_CFLAGS_ALLOW
+// A regular expression specifying additional flags to allow
+// to appear in #cgo CFLAGS source code directives.
+// Does not apply to the CGO_CFLAGS environment variable.
+// CGO_CFLAGS_DISALLOW
+// A regular expression specifying flags that must be disallowed
+// from appearing in #cgo CFLAGS source code directives.
+// Does not apply to the CGO_CFLAGS environment variable.
+// CGO_CPPFLAGS, CGO_CPPFLAGS_ALLOW, CGO_CPPFLAGS_DISALLOW
+// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+// but for the C preprocessor.
+// CGO_CXXFLAGS, CGO_CXXFLAGS_ALLOW, CGO_CXXFLAGS_DISALLOW
+// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+// but for the C++ compiler.
+// CGO_FFLAGS, CGO_FFLAGS_ALLOW, CGO_FFLAGS_DISALLOW
+// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+// but for the Fortran compiler.
+// CGO_LDFLAGS, CGO_LDFLAGS_ALLOW, CGO_LDFLAGS_DISALLOW
+// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+// but for the linker.
+// CXX
+// The command to use to compile C++ code.
+// PKG_CONFIG
+// Path to pkg-config tool.
+//
+// Architecture-specific environment variables:
+//
+// GOARM
+// For GOARCH=arm, the ARM architecture for which to compile.
+// Valid values are 5, 6, 7.
+// GO386
+// For GOARCH=386, the floating point instruction set.
+// Valid values are 387, sse2.
+// GOMIPS
+// For GOARCH=mips{,le}, whether to use floating point instructions.
+// Valid values are hardfloat (default), softfloat.
+//
+// Special-purpose environment variables:
+//
+// GOROOT_FINAL
+// The root of the installed Go tree, when it is
+// installed in a location other than where it is built.
+// File names in stack traces are rewritten from GOROOT to
+// GOROOT_FINAL.
+// GO_EXTLINK_ENABLED
+// Whether the linker should use external linking mode
+// when using -linkmode=auto with code that uses cgo.
+// Set to 0 to disable external linking mode, 1 to enable it.
+// GIT_ALLOW_PROTOCOL
+// Defined by Git. A colon-separated list of schemes that are allowed to be used
+// with git fetch/clone. If set, any scheme not explicitly mentioned will be
+// considered insecure by 'go get'.
+//
+//
// File types
//
// The go command examines the contents of a restricted set of files
// See https://golang.org/s/go15vendor for details.
//
//
-// Environment variables
-//
-// The go command, and the tools it invokes, examine a few different
-// environment variables. For many of these, you can see the default
-// value of on your system by running 'go env NAME', where NAME is the
-// name of the variable.
-//
-// General-purpose environment variables:
-//
-// GCCGO
-// The gccgo command to run for 'go build -compiler=gccgo'.
-// GOARCH
-// The architecture, or processor, for which to compile code.
-// Examples are amd64, 386, arm, ppc64.
-// GOBIN
-// The directory where 'go install' will install a command.
-// GOOS
-// The operating system for which to compile code.
-// Examples are linux, darwin, windows, netbsd.
-// GOPATH
-// For more details see: 'go help gopath'.
-// GORACE
-// Options for the race detector.
-// See https://golang.org/doc/articles/race_detector.html.
-// GOROOT
-// The root of the go tree.
-// GOTMPDIR
-// The directory where the go command will write
-// temporary source files, packages, and binaries.
-// GOCACHE
-// The directory where the go command will store
-// cached information for reuse in future builds.
-//
-// Environment variables for use with cgo:
-//
-// CC
-// The command to use to compile C code.
-// CGO_ENABLED
-// Whether the cgo command is supported. Either 0 or 1.
-// CGO_CFLAGS
-// Flags that cgo will pass to the compiler when compiling
-// C code.
-// CGO_CFLAGS_ALLOW
-// A regular expression specifying additional flags to allow
-// to appear in #cgo CFLAGS source code directives.
-// Does not apply to the CGO_CFLAGS environment variable.
-// CGO_CFLAGS_DISALLOW
-// A regular expression specifying flags that must be disallowed
-// from appearing in #cgo CFLAGS source code directives.
-// Does not apply to the CGO_CFLAGS environment variable.
-// CGO_CPPFLAGS, CGO_CPPFLAGS_ALLOW, CGO_CPPFLAGS_DISALLOW
-// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
-// but for the C preprocessor.
-// CGO_CXXFLAGS, CGO_CXXFLAGS_ALLOW, CGO_CXXFLAGS_DISALLOW
-// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
-// but for the C++ compiler.
-// CGO_FFLAGS, CGO_FFLAGS_ALLOW, CGO_FFLAGS_DISALLOW
-// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
-// but for the Fortran compiler.
-// CGO_LDFLAGS, CGO_LDFLAGS_ALLOW, CGO_LDFLAGS_DISALLOW
-// Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
-// but for the linker.
-// CXX
-// The command to use to compile C++ code.
-// PKG_CONFIG
-// Path to pkg-config tool.
-//
-// Architecture-specific environment variables:
-//
-// GOARM
-// For GOARCH=arm, the ARM architecture for which to compile.
-// Valid values are 5, 6, 7.
-// GO386
-// For GOARCH=386, the floating point instruction set.
-// Valid values are 387, sse2.
-// GOMIPS
-// For GOARCH=mips{,le}, whether to use floating point instructions.
-// Valid values are hardfloat (default), softfloat.
-//
-// Special-purpose environment variables:
-//
-// GOROOT_FINAL
-// The root of the installed Go tree, when it is
-// installed in a location other than where it is built.
-// File names in stack traces are rewritten from GOROOT to
-// GOROOT_FINAL.
-// GO_EXTLINK_ENABLED
-// Whether the linker should use external linking mode
-// when using -linkmode=auto with code that uses cgo.
-// Set to 0 to disable external linking mode, 1 to enable it.
-// GIT_ALLOW_PROTOCOL
-// Defined by Git. A colon-separated list of schemes that are allowed to be used
-// with git fetch/clone. If set, any scheme not explicitly mentioned will be
-// considered insecure by 'go get'.
-//
-//
// Import path syntax
//
// An import path (see 'go help packages') denotes a package stored in the local