// if those packages are not found in existing dependencies of the main module.

import (
	"context"
	"errors"
	"fmt"
	"go/build"
	"internal/diff"
	"io/fs"
	"maps"
	"os"
	"path"
	pathpkg "path"
	"path/filepath"
	"runtime"
	"slices"
	"sort"
	"strings"
	"sync"
	"sync/atomic"

	"cmd/go/internal/base"
	"cmd/go/internal/cfg"
	"cmd/go/internal/fsys"
	"cmd/go/internal/gover"

	"go/ast"
	"go/build/constraint"
	"go/doc"
	"go/token"
	"internal/buildcfg"
	"internal/godebug"
	"internal/goroot"
	"internal/goversion"
	"internal/platform"
	"io"
	"io/fs"
	"os"
	"os/exec"
	pathpkg "path"
	"path/filepath"
	"runtime"
	"slices"
	"strconv"
	"strings"
	"unicode"
	"unicode/utf8"
	_ "unsafe" // for linkname
)

// A Context specifies the supporting context for a build.