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alldocs.go
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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Code generated by 'go test cmd/go -v -run=^TestDocsUpToDate$ -fixdocs'; DO NOT EDIT.
// Edit the documentation in other files and then execute 'go generate cmd/go' to generate this one.
// Go is a tool for managing Go source code.
//
// Usage:
//
// go <command> [arguments]
//
// The commands are:
//
// bug start a bug report
// build compile packages and dependencies
// clean remove object files and cached files
// doc show documentation for package or symbol
// env print Go environment information
// fix update packages to use new APIs
// fmt gofmt (reformat) package sources
// generate generate Go files by processing source
// get add dependencies to current module and install them
// install compile and install packages and dependencies
// list list packages or modules
// mod module maintenance
// work workspace maintenance
// run compile and run Go program
// telemetry manage telemetry data and settings
// test test packages
// tool run specified go tool
// version print Go version
// vet report likely mistakes in packages
//
// Use "go help <command>" for more information about a command.
//
// Additional help topics:
//
// buildconstraint build constraints
// buildjson build -json encoding
// buildmode build modes
// c calling between Go and C
// cache build and test caching
// environment environment variables
// filetype file types
// goauth GOAUTH environment variable
// go.mod the go.mod file
// gopath GOPATH environment variable
// goproxy module proxy protocol
// importpath import path syntax
// modules modules, module versions, and more
// module-auth module authentication using go.sum
// packages package lists and patterns
// private configuration for downloading non-public code
// testflag testing flags
// testfunc testing functions
// vcs controlling version control with GOVCS
//
// Use "go help <topic>" for more information about that topic.
//
// # Start a bug report
//
// Usage:
//
// go bug
//
// Bug opens the default browser and starts a new bug report.
// The report includes useful system information.
//
// # Compile packages and dependencies
//
// Usage:
//
// go build [-o output] [build flags] [packages]
//
// Build compiles the packages named by the import paths,
// along with their dependencies, but it does not install the results.
//
// If the arguments to build are a list of .go files from a single directory,
// build treats them as a list of source files specifying a single package.
//
// When compiling packages, build ignores files that end in '_test.go'.
//
// When compiling a single main package, build writes the resulting
// executable to an output file named after the last non-major-version
// component of the package import path. The '.exe' suffix is added
// when writing a Windows executable.
// So 'go build example/sam' writes 'sam' or 'sam.exe'.
// 'go build example.com/foo/v2' writes 'foo' or 'foo.exe', not 'v2.exe'.
//
// When compiling a package from a list of .go files, the executable
// is named after the first source file.
// 'go build ed.go rx.go' writes 'ed' or 'ed.exe'.
//
// When compiling multiple packages or a single non-main package,
// build compiles the packages but discards the resulting object,
// serving only as a check that the packages can be built.
//
// The -o flag forces build to write the resulting executable or object
// to the named output file or directory, instead of the default behavior described
// in the last two paragraphs. If the named output is an existing directory or
// ends with a slash or backslash, then any resulting executables
// will be written to that directory.
//
// The build flags are shared by the build, clean, get, install, list, run,
// and test commands:
//
// -C dir
// Change to dir before running the command.
// Any files named on the command line are interpreted after
// changing directories.
// If used, this flag must be the first one in the command line.
// -a
// force rebuilding of packages that are already up-to-date.
// -n
// print the commands but do not run them.
// -p n
// the number of programs, such as build commands or
// test binaries, that can be run in parallel.
// The default is GOMAXPROCS, normally the number of CPUs available.
// -race
// enable data race detection.
// Supported only on linux/amd64, freebsd/amd64, darwin/amd64, darwin/arm64, windows/amd64,
// linux/ppc64le and linux/arm64 (only for 48-bit VMA).
// -msan
// enable interoperation with memory sanitizer.
// Supported only on linux/amd64, linux/arm64, linux/loong64, freebsd/amd64
// and only with Clang/LLVM as the host C compiler.
// PIE build mode will be used on all platforms except linux/amd64.
// -asan
// enable interoperation with address sanitizer.
// Supported only on linux/arm64, linux/amd64, linux/loong64.
// Supported on linux/amd64 or linux/arm64 and only with GCC 7 and higher
// or Clang/LLVM 9 and higher.
// And supported on linux/loong64 only with Clang/LLVM 16 and higher.
// -cover
// enable code coverage instrumentation.
// -covermode set,count,atomic
// set the mode for coverage analysis.
// The default is "set" unless -race is enabled,
// in which case it is "atomic".
// The values:
// set: bool: does this statement run?
// count: int: how many times does this statement run?
// atomic: int: count, but correct in multithreaded tests;
// significantly more expensive.
// Sets -cover.
// -coverpkg pattern1,pattern2,pattern3
// For a build that targets package 'main' (e.g. building a Go
// executable), apply coverage analysis to each package whose
// import path matches the patterns. The default is to apply
// coverage analysis to packages in the main Go module. See
// 'go help packages' for a description of package patterns.
// Sets -cover.
// -v
// print the names of packages as they are compiled.
// -work
// print the name of the temporary work directory and
// do not delete it when exiting.
// -x
// print the commands.
// -asmflags '[pattern=]arg list'
// arguments to pass on each go tool asm invocation.
// -buildmode mode
// build mode to use. See 'go help buildmode' for more.
// -buildvcs
// Whether to stamp binaries with version control information
// ("true", "false", or "auto"). By default ("auto"), version control
// information is stamped into a binary if the main package, the main module
// containing it, and the current directory are all in the same repository.
// Use -buildvcs=false to always omit version control information, or
// -buildvcs=true to error out if version control information is available but
// cannot be included due to a missing tool or ambiguous directory structure.
// -compiler name
// name of compiler to use, as in runtime.Compiler (gccgo or gc).
// -gccgoflags '[pattern=]arg list'
// arguments to pass on each gccgo compiler/linker invocation.
// -gcflags '[pattern=]arg list'
// arguments to pass on each go tool compile invocation.
// -installsuffix suffix
// a suffix to use in the name of the package installation directory,
// in order to keep output separate from default builds.
// If using the -race flag, the install suffix is automatically set to race
// or, if set explicitly, has _race appended to it. Likewise for the -msan
// and -asan flags. Using a -buildmode option that requires non-default compile
// flags has a similar effect.
// -json
// Emit build output in JSON suitable for automated processing.
// See 'go help buildjson' for the encoding details.
// -ldflags '[pattern=]arg list'
// arguments to pass on each go tool link invocation.
// -linkshared
// build code that will be linked against shared libraries previously
// created with -buildmode=shared.
// -mod mode
// module download mode to use: readonly, vendor, or mod.
// By default, if a vendor directory is present and the go version in go.mod
// is 1.14 or higher, the go command acts as if -mod=vendor were set.
// Otherwise, the go command acts as if -mod=readonly were set.
// See https://golang.org/ref/mod#build-commands for details.
// -modcacherw
// leave newly-created directories in the module cache read-write
// instead of making them read-only.
// -modfile file
// in module aware mode, read (and possibly write) an alternate go.mod
// file instead of the one in the module root directory. A file named
// "go.mod" must still be present in order to determine the module root
// directory, but it is not accessed. When -modfile is specified, an
// alternate go.sum file is also used: its path is derived from the
// -modfile flag by trimming the ".mod" extension and appending ".sum".
// -overlay file
// read a JSON config file that provides an overlay for build operations.
// The file is a JSON object with a single field, named 'Replace', that
// maps each disk file path (a string) to its backing file path, so that
// a build will run as if the disk file path exists with the contents
// given by the backing file paths, or as if the disk file path does not
// exist if its backing file path is empty. Support for the -overlay flag
// has some limitations: importantly, cgo files included from outside the
// include path must be in the same directory as the Go package they are
// included from, overlays will not appear when binaries and tests are
// run through go run and go test respectively, and files beneath
// GOMODCACHE may not be replaced.
// -pgo file
// specify the file path of a profile for profile-guided optimization (PGO).
// When the special name "auto" is specified, for each main package in the
// build, the go command selects a file named "default.pgo" in the package's
// directory if that file exists, and applies it to the (transitive)
// dependencies of the main package (other packages are not affected).
// Special name "off" turns off PGO. The default is "auto".
// -pkgdir dir
// install and load all packages from dir instead of the usual locations.
// For example, when building with a non-standard configuration,
// use -pkgdir to keep generated packages in a separate location.
// -tags tag,list
// a comma-separated list of additional build tags to consider satisfied
// during the build. For more information about build tags, see
// 'go help buildconstraint'. (Earlier versions of Go used a
// space-separated list, and that form is deprecated but still recognized.)
// -trimpath
// remove all file system paths from the resulting executable.
// Instead of absolute file system paths, the recorded file names
// will begin either a module path@version (when using modules),
// or a plain import path (when using the standard library, or GOPATH).
// -toolexec 'cmd args'
// a program to use to invoke toolchain programs like vet and asm.
// For example, instead of running asm, the go command will run
// 'cmd args /path/to/asm <arguments for asm>'.
// The TOOLEXEC_IMPORTPATH environment variable will be set,
// matching 'go list -f {{.ImportPath}}' for the package being built.
//
// The -asmflags, -gccgoflags, -gcflags, and -ldflags flags accept a
// space-separated list of arguments to pass to an underlying tool
// during the build. To embed spaces in an element in the list, surround
// it with either single or double quotes. The argument list may be
// preceded by a package pattern and an equal sign, which restricts
// the use of that argument list to the building of packages matching
// that pattern (see 'go help packages' for a description of package
// patterns). Without a pattern, the argument list applies only to the
// packages named on the command line. The flags may be repeated
// with different patterns in order to specify different arguments for
// different sets of packages. If a package matches patterns given in
// multiple flags, the latest match on the command line wins.
// For example, 'go build -gcflags=-S fmt' prints the disassembly
// only for package fmt, while 'go build -gcflags=all=-S fmt'
// prints the disassembly for fmt and all its dependencies.
//
// For more about specifying packages, see 'go help packages'.
// For more about where packages and binaries are installed,
// run 'go help gopath'.
// For more about calling between Go and C/C++, run 'go help c'.
//
// Note: Build adheres to certain conventions such as those described
// by 'go help gopath'. Not all projects can follow these conventions,
// however. Installations that have their own conventions or that use
// a separate software build system may choose to use lower-level
// invocations such as 'go tool compile' and 'go tool link' to avoid
// some of the overheads and design decisions of the build tool.
//
// See also: go install, go get, go clean.
//
// # Remove object files and cached files
//
// Usage:
//
// go clean [-i] [-r] [-cache] [-testcache] [-modcache] [-fuzzcache] [build flags] [packages]
//
// Clean removes object files from package source directories.
// The go command builds most objects in a temporary directory,
// so go clean is mainly concerned with object files left by other
// tools or by manual invocations of go build.
//
// If a package argument is given or the -i or -r flag is set,
// clean removes the following files from each of the
// source directories corresponding to the import paths:
//
// _obj/ old object directory, left from Makefiles
// _test/ old test directory, left from Makefiles
// _testmain.go old gotest file, left from Makefiles
// test.out old test log, left from Makefiles
// build.out old test log, left from Makefiles
// *.[568ao] object files, left from Makefiles
//
// DIR(.exe) from go build
// DIR.test(.exe) from go test -c
// MAINFILE(.exe) from go build MAINFILE.go
// *.so from SWIG
//
// In the list, DIR represents the final path element of the
// directory, and MAINFILE is the base name of any Go source
// file in the directory that is not included when building
// the package.
//
// The -i flag causes clean to remove the corresponding installed
// archive or binary (what 'go install' would create).
//
// The -n flag causes clean to print the remove commands it would execute,
// but not run them.
//
// The -r flag causes clean to be applied recursively to all the
// dependencies of the packages named by the import paths.
//
// The -x flag causes clean to print remove commands as it executes them.
//
// The -cache flag causes clean to remove the entire go build cache.
//
// The -testcache flag causes clean to expire all test results in the
// go build cache.
//
// The -modcache flag causes clean to remove the entire module
// download cache, including unpacked source code of versioned
// dependencies.
//
// The -fuzzcache flag causes clean to remove files stored in the Go build
// cache for fuzz testing. The fuzzing engine caches files that expand
// code coverage, so removing them may make fuzzing less effective until
// new inputs are found that provide the same coverage. These files are
// distinct from those stored in testdata directory; clean does not remove
// those files.
//
// For more about build flags, see 'go help build'.
//
// For more about specifying packages, see 'go help packages'.
//
// # Show documentation for package or symbol
//
// Usage:
//
// go doc [doc flags] [package|[package.]symbol[.methodOrField]]
//
// Doc prints the documentation comments associated with the item identified by its
// arguments (a package, const, func, type, var, method, or struct field)
// followed by a one-line summary of each of the first-level items "under"
// that item (package-level declarations for a package, methods for a type,
// etc.).
//
// Doc accepts zero, one, or two arguments.
//
// Given no arguments, that is, when run as
//
// go doc
//
// it prints the package documentation for the package in the current directory.
// If the package is a command (package main), the exported symbols of the package
// are elided from the presentation unless the -cmd flag is provided.
//
// When run with one argument, the argument is treated as a Go-syntax-like
// representation of the item to be documented. What the argument selects depends
// on what is installed in GOROOT and GOPATH, as well as the form of the argument,
// which is schematically one of these:
//
// go doc <pkg>
// go doc <sym>[.<methodOrField>]
// go doc [<pkg>.]<sym>[.<methodOrField>]
// go doc [<pkg>.][<sym>.]<methodOrField>
//
// The first item in this list matched by the argument is the one whose documentation
// is printed. (See the examples below.) However, if the argument starts with a capital
// letter it is assumed to identify a symbol or method in the current directory.
//
// For packages, the order of scanning is determined lexically in breadth-first order.
// That is, the package presented is the one that matches the search and is nearest
// the root and lexically first at its level of the hierarchy. The GOROOT tree is
// always scanned in its entirety before GOPATH.
//
// If there is no package specified or matched, the package in the current
// directory is selected, so "go doc Foo" shows the documentation for symbol Foo in
// the current package.
//
// The package path must be either a qualified path or a proper suffix of a
// path. The go tool's usual package mechanism does not apply: package path
// elements like . and ... are not implemented by go doc.
//
// When run with two arguments, the first is a package path (full path or suffix),
// and the second is a symbol, or symbol with method or struct field:
//
// go doc <pkg> <sym>[.<methodOrField>]
//
// In all forms, when matching symbols, lower-case letters in the argument match
// either case but upper-case letters match exactly. This means that there may be
// multiple matches of a lower-case argument in a package if different symbols have
// different cases. If this occurs, documentation for all matches is printed.
//
// Examples:
//
// go doc
// Show documentation for current package.
// go doc Foo
// Show documentation for Foo in the current package.
// (Foo starts with a capital letter so it cannot match
// a package path.)
// go doc encoding/json
// Show documentation for the encoding/json package.
// go doc json
// Shorthand for encoding/json.
// go doc json.Number (or go doc json.number)
// Show documentation and method summary for json.Number.
// go doc json.Number.Int64 (or go doc json.number.int64)
// Show documentation for json.Number's Int64 method.
// go doc cmd/doc
// Show package docs for the doc command.
// go doc -cmd cmd/doc
// Show package docs and exported symbols within the doc command.
// go doc template.new
// Show documentation for html/template's New function.
// (html/template is lexically before text/template)
// go doc text/template.new # One argument
// Show documentation for text/template's New function.
// go doc text/template new # Two arguments
// Show documentation for text/template's New function.
//
// At least in the current tree, these invocations all print the
// documentation for json.Decoder's Decode method:
//
// go doc json.Decoder.Decode
// go doc json.decoder.decode
// go doc json.decode
// cd go/src/encoding/json; go doc decode
//
// Flags:
//
// -all
// Show all the documentation for the package.
// -c
// Respect case when matching symbols.
// -cmd
// Treat a command (package main) like a regular package.
// Otherwise package main's exported symbols are hidden
// when showing the package's top-level documentation.
// -short
// One-line representation for each symbol.
// -src
// Show the full source code for the symbol. This will
// display the full Go source of its declaration and
// definition, such as a function definition (including
// the body), type declaration or enclosing const
// block. The output may therefore include unexported
// details.
// -u
// Show documentation for unexported as well as exported
// symbols, methods, and fields.
//
// # Print Go environment information
//
// Usage:
//
// go env [-json] [-changed] [-u] [-w] [var ...]
//
// Env prints Go environment information.
//
// By default env prints information as a shell script
// (on Windows, a batch file). If one or more variable
// names is given as arguments, env prints the value of
// each named variable on its own line.
//
// The -json flag prints the environment in JSON format
// instead of as a shell script.
//
// The -u flag requires one or more arguments and unsets
// the default setting for the named environment variables,
// if one has been set with 'go env -w'.
//
// The -w flag requires one or more arguments of the
// form NAME=VALUE and changes the default settings
// of the named environment variables to the given values.
//
// The -changed flag prints only those settings whose effective
// value differs from the default value that would be obtained in
// an empty environment with no prior uses of the -w flag.
//
// For more about environment variables, see 'go help environment'.
//
// # Update packages to use new APIs
//
// Usage:
//
// go fix [-fix list] [packages]
//
// Fix runs the Go fix command on the packages named by the import paths.
//
// The -fix flag sets a comma-separated list of fixes to run.
// The default is all known fixes.
// (Its value is passed to 'go tool fix -r'.)
//
// For more about fix, see 'go doc cmd/fix'.
// For more about specifying packages, see 'go help packages'.
//
// To run fix with other options, run 'go tool fix'.
//
// See also: go fmt, go vet.
//
// # Gofmt (reformat) package sources
//
// Usage:
//
// go fmt [-n] [-x] [packages]
//
// Fmt runs the command 'gofmt -l -w' on the packages named
// by the import paths. It prints the names of the files that are modified.
//
// For more about gofmt, see 'go doc cmd/gofmt'.
// For more about specifying packages, see 'go help packages'.
//
// The -n flag prints commands that would be executed.
// The -x flag prints commands as they are executed.
//
// The -mod flag's value sets which module download mode
// to use: readonly or vendor. See 'go help modules' for more.
//
// To run gofmt with specific options, run gofmt itself.
//
// See also: go fix, go vet.
//
// # Generate Go files by processing source
//
// Usage:
//
// go generate [-run regexp] [-n] [-v] [-x] [build flags] [file.go... | packages]
//
// Generate runs commands described by directives within existing
// files. Those commands can run any process but the intent is to
// create or update Go source files.
//
// Go generate is never run automatically by go build, go test,
// and so on. It must be run explicitly.
//
// Go generate scans the file for directives, which are lines of
// the form,
//
// //go:generate command argument...
//
// (note: no leading spaces and no space in "//go") where command
// is the generator to be run, corresponding to an executable file
// that can be run locally. It must either be in the shell path
// (gofmt), a fully qualified path (/usr/you/bin/mytool), or a
// command alias, described below.
//
// Note that go generate does not parse the file, so lines that look
// like directives in comments or multiline strings will be treated
// as directives.
//
// The arguments to the directive are space-separated tokens or
// double-quoted strings passed to the generator as individual
// arguments when it is run.
//
// Quoted strings use Go syntax and are evaluated before execution; a
// quoted string appears as a single argument to the generator.
//
// To convey to humans and machine tools that code is generated,
// generated source should have a line that matches the following
// regular expression (in Go syntax):
//
// ^// Code generated .* DO NOT EDIT\.$
//
// This line must appear before the first non-comment, non-blank
// text in the file.
//
// Go generate sets several variables when it runs the generator:
//
// $GOARCH
// The execution architecture (arm, amd64, etc.)
// $GOOS
// The execution operating system (linux, windows, etc.)
// $GOFILE
// The base name of the file.
// $GOLINE
// The line number of the directive in the source file.
// $GOPACKAGE
// The name of the package of the file containing the directive.
// $GOROOT
// The GOROOT directory for the 'go' command that invoked the
// generator, containing the Go toolchain and standard library.
// $DOLLAR
// A dollar sign.
// $PATH
// The $PATH of the parent process, with $GOROOT/bin
// placed at the beginning. This causes generators
// that execute 'go' commands to use the same 'go'
// as the parent 'go generate' command.
//
// Other than variable substitution and quoted-string evaluation, no
// special processing such as "globbing" is performed on the command
// line.
//
// As a last step before running the command, any invocations of any
// environment variables with alphanumeric names, such as $GOFILE or
// $HOME, are expanded throughout the command line. The syntax for
// variable expansion is $NAME on all operating systems. Due to the
// order of evaluation, variables are expanded even inside quoted
// strings. If the variable NAME is not set, $NAME expands to the
// empty string.
//
// A directive of the form,
//
// //go:generate -command xxx args...
//
// specifies, for the remainder of this source file only, that the
// string xxx represents the command identified by the arguments. This
// can be used to create aliases or to handle multiword generators.
// For example,
//
// //go:generate -command foo go tool foo
//
// specifies that the command "foo" represents the generator
// "go tool foo".
//
// Generate processes packages in the order given on the command line,
// one at a time. If the command line lists .go files from a single directory,
// they are treated as a single package. Within a package, generate processes the
// source files in a package in file name order, one at a time. Within
// a source file, generate runs generators in the order they appear
// in the file, one at a time. The go generate tool also sets the build
// tag "generate" so that files may be examined by go generate but ignored
// during build.
//
// For packages with invalid code, generate processes only source files with a
// valid package clause.
//
// If any generator returns an error exit status, "go generate" skips
// all further processing for that package.
//
// The generator is run in the package's source directory.
//
// Go generate accepts two specific flags:
//
// -run=""
// if non-empty, specifies a regular expression to select
// directives whose full original source text (excluding
// any trailing spaces and final newline) matches the
// expression.
//
// -skip=""
// if non-empty, specifies a regular expression to suppress
// directives whose full original source text (excluding
// any trailing spaces and final newline) matches the
// expression. If a directive matches both the -run and
// the -skip arguments, it is skipped.
//
// It also accepts the standard build flags including -v, -n, and -x.
// The -v flag prints the names of packages and files as they are
// processed.
// The -n flag prints commands that would be executed.
// The -x flag prints commands as they are executed.
//
// For more about build flags, see 'go help build'.
//
// For more about specifying packages, see 'go help packages'.
//
// # Add dependencies to current module and install them
//
// Usage:
//
// go get [-t] [-u] [-tool] [build flags] [packages]
//
// Get resolves its command-line arguments to packages at specific module versions,
// updates go.mod to require those versions, and downloads source code into the
// module cache.
//
// To add a dependency for a package or upgrade it to its latest version:
//
// go get example.com/pkg
//
// To upgrade or downgrade a package to a specific version:
//
// go get example.com/pkg@v1.2.3
//
// To remove a dependency on a module and downgrade modules that require it:
//
// go get example.com/mod@none
//
// To upgrade the minimum required Go version to the latest released Go version:
//
// go get go@latest
//
// To upgrade the Go toolchain to the latest patch release of the current Go toolchain:
//
// go get toolchain@patch
//
// See https://golang.org/ref/mod#go-get for details.
//
// In earlier versions of Go, 'go get' was used to build and install packages.
// Now, 'go get' is dedicated to adjusting dependencies in go.mod. 'go install'
// may be used to build and install commands instead. When a version is specified,
// 'go install' runs in module-aware mode and ignores the go.mod file in the
// current directory. For example:
//
// go install example.com/pkg@v1.2.3
// go install example.com/pkg@latest
//
// See 'go help install' or https://golang.org/ref/mod#go-install for details.
//
// 'go get' accepts the following flags.
//
// The -t flag instructs get to consider modules needed to build tests of
// packages specified on the command line.
//
// The -u flag instructs get to update modules providing dependencies
// of packages named on the command line to use newer minor or patch
// releases when available.
//
// The -u=patch flag (not -u patch) also instructs get to update dependencies,
// but changes the default to select patch releases.
//
// When the -t and -u flags are used together, get will update
// test dependencies as well.
//
// The -tool flag instructs go to add a matching tool line to go.mod for each
// listed package. If -tool is used with @none, the line will be removed.
//
// The -x flag prints commands as they are executed. This is useful for
// debugging version control commands when a module is downloaded directly
// from a repository.
//
// For more about build flags, see 'go help build'.
//
// For more about modules, see https://golang.org/ref/mod.
//
// For more about using 'go get' to update the minimum Go version and
// suggested Go toolchain, see https://go.dev/doc/toolchain.
//
// For more about specifying packages, see 'go help packages'.
//
// See also: go build, go install, go clean, go mod.
//
// # Compile and install packages and dependencies
//
// Usage:
//
// go install [build flags] [packages]
//
// Install compiles and installs the packages named by the import paths.
//
// Executables are installed in the directory named by the GOBIN environment
// variable, which defaults to $GOPATH/bin or $HOME/go/bin if the GOPATH
// environment variable is not set. Executables in $GOROOT
// are installed in $GOROOT/bin or $GOTOOLDIR instead of $GOBIN.
//
// If the arguments have version suffixes (like @latest or @v1.0.0), "go install"
// builds packages in module-aware mode, ignoring the go.mod file in the current
// directory or any parent directory, if there is one. This is useful for
// installing executables without affecting the dependencies of the main module.
// To eliminate ambiguity about which module versions are used in the build, the
// arguments must satisfy the following constraints:
//
// - Arguments must be package paths or package patterns (with "..." wildcards).
// They must not be standard packages (like fmt), meta-patterns (std, cmd,
// all), or relative or absolute file paths.
//
// - All arguments must have the same version suffix. Different queries are not
// allowed, even if they refer to the same version.
//
// - All arguments must refer to packages in the same module at the same version.
//
// - Package path arguments must refer to main packages. Pattern arguments
// will only match main packages.
//
// - No module is considered the "main" module. If the module containing
// packages named on the command line has a go.mod file, it must not contain
// directives (replace and exclude) that would cause it to be interpreted
// differently than if it were the main module. The module must not require
// a higher version of itself.
//
// - Vendor directories are not used in any module. (Vendor directories are not
// included in the module zip files downloaded by 'go install'.)
//
// If the arguments don't have version suffixes, "go install" may run in
// module-aware mode or GOPATH mode, depending on the GO111MODULE environment
// variable and the presence of a go.mod file. See 'go help modules' for details.
// If module-aware mode is enabled, "go install" runs in the context of the main
// module.
//
// When module-aware mode is disabled, non-main packages are installed in the
// directory $GOPATH/pkg/$GOOS_$GOARCH. When module-aware mode is enabled,
// non-main packages are built and cached but not installed.
//
// Before Go 1.20, the standard library was installed to
// $GOROOT/pkg/$GOOS_$GOARCH.
// Starting in Go 1.20, the standard library is built and cached but not installed.
// Setting GODEBUG=installgoroot=all restores the use of
// $GOROOT/pkg/$GOOS_$GOARCH.
//
// For more about build flags, see 'go help build'.
//
// For more about specifying packages, see 'go help packages'.
//
// See also: go build, go get, go clean.
//
// # List packages or modules
//
// Usage:
//
// go list [-f format] [-json] [-m] [list flags] [build flags] [packages]
//
// List lists the named packages, one per line.
// The most commonly-used flags are -f and -json, which control the form
// of the output printed for each package. Other list flags, documented below,
// control more specific details.
//
// The default output shows the package import path:
//
// bytes
// encoding/json
// github.com/gorilla/mux
// golang.org/x/net/html
//
// The -f flag specifies an alternate format for the list, using the
// syntax of package template. The default output is equivalent
// to -f '{{.ImportPath}}'. The struct being passed to the template is:
//
// type Package struct {
// Dir string // directory containing package sources
// ImportPath string // import path of package in dir
// ImportComment string // path in import comment on package statement
// Name string // package name
// Doc string // package documentation string
// Target string // install path
// Shlib string // the shared library that contains this package (only set when -linkshared)
// Goroot bool // is this package in the Go root?
// Standard bool // is this package part of the standard Go library?
// Stale bool // would 'go install' do anything for this package?
// StaleReason string // explanation for Stale==true
// Root string // Go root or Go path dir containing this package
// ConflictDir string // this directory shadows Dir in $GOPATH
// BinaryOnly bool // binary-only package (no longer supported)
// ForTest string // package is only for use in named test
// Export string // file containing export data (when using -export)
// BuildID string // build ID of the compiled package (when using -export)
// Module *Module // info about package's containing module, if any (can be nil)
// Match []string // command-line patterns matching this package
// DepOnly bool // package is only a dependency, not explicitly listed
// DefaultGODEBUG string // default GODEBUG setting, for main packages
//
// // Source files
// GoFiles []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
// CgoFiles []string // .go source files that import "C"
// CompiledGoFiles []string // .go files presented to compiler (when using -compiled)
// IgnoredGoFiles []string // .go source files ignored due to build constraints
// IgnoredOtherFiles []string // non-.go source files ignored due to build constraints
// CFiles []string // .c source files
// CXXFiles []string // .cc, .cxx and .cpp source files
// MFiles []string // .m source files
// HFiles []string // .h, .hh, .hpp and .hxx source files
// FFiles []string // .f, .F, .for and .f90 Fortran source files
// SFiles []string // .s source files
// SwigFiles []string // .swig files
// SwigCXXFiles []string // .swigcxx files
// SysoFiles []string // .syso object files to add to archive
// TestGoFiles []string // _test.go files in package
// XTestGoFiles []string // _test.go files outside package
//
// // Embedded files
// EmbedPatterns []string // //go:embed patterns
// EmbedFiles []string // files matched by EmbedPatterns
// TestEmbedPatterns []string // //go:embed patterns in TestGoFiles
// TestEmbedFiles []string // files matched by TestEmbedPatterns
// XTestEmbedPatterns []string // //go:embed patterns in XTestGoFiles
// XTestEmbedFiles []string // files matched by XTestEmbedPatterns
//
// // Cgo directives
// CgoCFLAGS []string // cgo: flags for C compiler
// CgoCPPFLAGS []string // cgo: flags for C preprocessor
// CgoCXXFLAGS []string // cgo: flags for C++ compiler
// CgoFFLAGS []string // cgo: flags for Fortran compiler
// CgoLDFLAGS []string // cgo: flags for linker
// CgoPkgConfig []string // cgo: pkg-config names
//
// // Dependency information
// Imports []string // import paths used by this package
// ImportMap map[string]string // map from source import to ImportPath (identity entries omitted)
// Deps []string // all (recursively) imported dependencies
// TestImports []string // imports from TestGoFiles
// XTestImports []string // imports from XTestGoFiles
//
// // Error information
// Incomplete bool // this package or a dependency has an error
// Error *PackageError // error loading package
// DepsErrors []*PackageError // errors loading dependencies
// }
//
// Packages stored in vendor directories report an ImportPath that includes the
// path to the vendor directory (for example, "d/vendor/p" instead of "p"),
// so that the ImportPath uniquely identifies a given copy of a package.
// The Imports, Deps, TestImports, and XTestImports lists also contain these
// expanded import paths. See golang.org/s/go15vendor for more about vendoring.
//
// The error information, if any, is
//
// type PackageError struct {
// ImportStack []string // shortest path from package named on command line to this one
// Pos string // position of error (if present, file:line:col)
// Err string // the error itself
// }
//
// The module information is a Module struct, defined in the discussion
// of list -m below.
//
// The template function "join" calls strings.Join.
//
// The template function "context" returns the build context, defined as:
//
// type Context struct {
// GOARCH string // target architecture
// GOOS string // target operating system
// GOROOT string // Go root
// GOPATH string // Go path
// CgoEnabled bool // whether cgo can be used
// UseAllFiles bool // use files regardless of //go:build lines, file names
// Compiler string // compiler to assume when computing target paths
// BuildTags []string // build constraints to match in //go:build lines
// ToolTags []string // toolchain-specific build constraints
// ReleaseTags []string // releases the current release is compatible with
// InstallSuffix string // suffix to use in the name of the install dir
// }
//
// For more information about the meaning of these fields see the documentation
// for the go/build package's Context type.
//
// The -json flag causes the package data to be printed in JSON format
// instead of using the template format. The JSON flag can optionally be
// provided with a set of comma-separated required field names to be output.
// If so, those required fields will always appear in JSON output, but
// others may be omitted to save work in computing the JSON struct.
//
// The -compiled flag causes list to set CompiledGoFiles to the Go source
// files presented to the compiler. Typically this means that it repeats
// the files listed in GoFiles and then also adds the Go code generated
// by processing CgoFiles and SwigFiles. The Imports list contains the
// union of all imports from both GoFiles and CompiledGoFiles.
//
// The -deps flag causes list to iterate over not just the named packages
// but also all their dependencies. It visits them in a depth-first post-order
// traversal, so that a package is listed only after all its dependencies.
// Packages not explicitly listed on the command line will have the DepOnly
// field set to true.
//
// The -e flag changes the handling of erroneous packages, those that
// cannot be found or are malformed. By default, the list command
// prints an error to standard error for each erroneous package and
// omits the packages from consideration during the usual printing.
// With the -e flag, the list command never prints errors to standard
// error and instead processes the erroneous packages with the usual
// printing. Erroneous packages will have a non-empty ImportPath and
// a non-nil Error field; other information may or may not be missing
// (zeroed).
//
// The -export flag causes list to set the Export field to the name of a
// file containing up-to-date export information for the given package,
// and the BuildID field to the build ID of the compiled package.
//
// The -find flag causes list to identify the named packages but not
// resolve their dependencies: the Imports and Deps lists will be empty.
// With the -find flag, the -deps, -test and -export commands cannot be
// used.
//
// The -test flag causes list to report not only the named packages
// but also their test binaries (for packages with tests), to convey to
// source code analysis tools exactly how test binaries are constructed.
// The reported import path for a test binary is the import path of
// the package followed by a ".test" suffix, as in "math/rand.test".
// When building a test, it is sometimes necessary to rebuild certain
// dependencies specially for that test (most commonly the tested
// package itself). The reported import path of a package recompiled
// for a particular test binary is followed by a space and the name of
// the test binary in brackets, as in "math/rand [math/rand.test]"
// or "regexp [sort.test]". The ForTest field is also set to the name
// of the package being tested ("math/rand" or "sort" in the previous
// examples).
//
// The Dir, Target, Shlib, Root, ConflictDir, and Export file paths
// are all absolute paths.
//
// By default, the lists GoFiles, CgoFiles, and so on hold names of files in Dir
// (that is, paths relative to Dir, not absolute paths).
// The generated files added when using the -compiled and -test flags
// are absolute paths referring to cached copies of generated Go source files.
// Although they are Go source files, the paths may not end in ".go".
//
// The -m flag causes list to list modules instead of packages.
//
// When listing modules, the -f flag still specifies a format template