option. Packages named main are ignored.

	-buildmode=exe
		Build the listed main packages and everything they import into
		executables. Packages not named main are ignored.

	-buildmode=pie
		Build the listed main packages and everything they import into
		position independent executables (PIE). Packages not named
		main are ignored.

	-buildmode=plugin

// A "soft" error is an error that still permits a valid interpretation of a
// package (such as "unused variable"); "hard" errors may lead to unpredictable
// behavior if ignored.
type Error struct {
	Pos  syntax.Pos // error position
	Msg  string     // default error message, user-friendly
	Full string     // full error message, for debugging (may contain internal details)

}

func (w *typeWriter) tuple(tup *Tuple, variadic bool) {
	w.byte('(')
	if tup != nil {
		for i, v := range tup.vars {
			if i > 0 {
				w.byte(',')
			}
			// parameter names are ignored for type identity and thus type hashes
			if w.ctxt == nil && v.name != "" && w.paramNames {
				w.string(v.name)
				w.byte(' ')
			}
			typ := v.typ
			if variadic && i == len(tup.vars)-1 {

	Tp, _ := T.(*TypeParam)

	// "V and T have identical underlying types if tags are ignored
	// and V and T are not type parameters"
	if IdenticalIgnoreTags(Vu, Tu) && Vp == nil && Tp == nil {
		return true
	}

	// "V and T are unnamed pointer types and their pointer base types
	// have identical underlying types if tags are ignored
	// and their pointer base types are not type parameters"
	if V, ok := V.(*Pointer); ok {

//		option. Packages named main are ignored.
//
//	-buildmode=exe
//		Build the listed main packages and everything they import into
//		executables. Packages not named main are ignored.
//
//	-buildmode=pie
//		Build the listed main packages and everything they import into
//		position independent executables (PIE). Packages not named
//		main are ignored.
//
//	-buildmode=plugin

	// arguments we have, and continue with that parameter list.

	// Substitute type arguments for their respective type parameters in params,
	// if any. Note that nil targs entries are ignored by check.subst.
	// We do this for better error messages; it's not needed for correctness.
	// For instance, given:
	//
	//   func f[P, Q any](P, Q) {}
	//
	//   func _(s string) {
	//           f[int](s, s) // ERROR

	"fmt"
	. "internal/types/errors"
)

// ----------------------------------------------------------------------------
// API

// A Signature represents a (non-builtin) function or method type.
// The receiver is ignored when comparing signatures for identity.
type Signature struct {
	// We need to keep the scope in Signature (rather than passing it around
	// and store it in the Func Object) because when type-checking a function

	}

	if cleanTestcache && !cleanCache {
		// Instead of walking through the entire cache looking for test results,
		// we write a file to the cache indicating that all test results from before
		// right now are to be ignored.
		dir, _ := cache.DefaultDir()
		if dir != "off" {
			f, err := lockedfile.Edit(filepath.Join(dir, "testexpire.txt"))
			if err == nil {
				now := time.Now().UnixNano()
				buf, _ := io.ReadAll(f)

// If a call fails (returns false), unification fails.
//
// In the unification context, structural equivalence of two types
// ignores the difference between a defined type and its underlying
// type if one type is a defined type and the other one is not.
// It also ignores the difference between an (external, unbound)
// type parameter and its core type.
// If two types are not structurally equivalent, they cannot be Go

			testHeader{Header{
				Typeflag: TypeReg,
				Name:     "file",
				Uname:    strings.Repeat("long", 10),
				PAXRecords: map[string]string{
					"path":           "FILE", // Should be ignored
					"GNU.sparse.map": "0,0",  // Should be ignored
					"comment":        "Hello, 世界",
					"GOLANG.pkg":     "tar",
				},
			}, nil},
			testClose{nil},
		},
	}, {