func f(x *operand, e *syntax.Expr, ...)

where e is the expression to be checked, and x is the result of the check.
The check performed by f may fail in which case x.mode == invalid, and
related error messages will have been issued by f.

If a hint argument is present, it is the composite literal element type
of an outer composite literal; it is used to type-check composite literal

	p.errorAt(pos, "syntax error: unexpected "+tok+msg)
}

// tokstring returns the English word for selected punctuation tokens
// for more readable error messages. Use tokstring (not tok.String())
// for user-facing (error) messages; use tok.String() for debugging
// output.
func tokstring(tok token) string {
	switch tok {
	case _Comma:
		return "comma"
	case _Semi:
		return "semicolon or newline"

		return needType
	}

	// Coerce gcc into telling us whether each name is a type, a value, or undeclared.
	// For names, find out whether they are integer constants.
	// We used to look at specific warning or error messages here, but that tied the
	// behavior too closely to specific versions of the compilers.
	// Instead, arrange that we can infer what we need from only the presence or absence
	// of an error on a specific line.
	//

	    of GOMAXPROCS. -cpu does not apply to fuzz tests matched by -fuzz.

	-failfast
	    Do not start new tests after the first test failure.

	-fullpath
	    Show full file names in the error messages.

	-fuzz regexp
	    Run the fuzz test matching the regular expression. When specified,
	    the command line argument must match exactly one package within the

		// Other errors may affect package loading, but not resolution.
		if _, err := fsys.Stat(absDir); err != nil {
			if os.IsNotExist(err) {
				// Canonicalize OS-specific errors to errDirectoryNotFound so that error
				// messages will be easier for users to search for.
				return "", &fs.PathError{Op: "stat", Path: absDir, Err: errDirectoryNotFound}
			}
			return "", err
		}
		if _, noGo := err.(*build.NoGoError); noGo {

	runSkips       = flag.Bool("run_skips", false, "run skipped tests (ignore skip and build tags)")
	linkshared     = flag.Bool("linkshared", false, "")
	updateErrors   = flag.Bool("update_errors", false, "update error messages in test file based on compiler output")
	runoutputLimit = flag.Int("l", defaultRunOutputLimit(), "number of parallel runoutput tests to run")
	force          = flag.Bool("f", false, "ignore expected-failure test lists")

	if ctxt.HeadType == objabi.Haix {
		// Initial map used to store package size for each DWARF section.
		dwsectCUSize = make(map[string]uint64)
	}

	// For ctxt.Diagnostic messages.
	newattr(&dwtypes, dwarf.DW_AT_name, dwarf.DW_CLS_STRING, int64(len("dwtypes")), "dwtypes")

	// Unspecified type. There are no references to this in the symbol table.

//   - Types[TUNSAFEPTR] is package unsafe's Pointer type.
var Types [NTYPE]*Type

var (
	// Predeclared alias types. These are actually created as distinct
	// defined types for better error messages, but are then specially
	// treated as identical to their respective underlying types.
	AnyType  *Type
	ByteType *Type
	RuneType *Type

	// Predeclared error interface type.
	ErrorType *Type

	{117, "ECANCELED", "asynchronous I/O cancelled"},
	{118, "ENOSR", "out of STREAMS resources"},
	{119, "ETIME", "system call timed out"},
	{120, "EBADMSG", "next message has wrong type"},
	{121, "EPROTO", "error in protocol"},
	{122, "ENODATA", "no message on stream head read q"},
	{123, "ENOSTR", "fd not associated with a stream"},
	{124, "ENOTSUP", "unsupported attribute value"},
	{125, "EMULTIHOP", "multihop is not allowed"},

	{87, "EOVERFLOW", "value too large to be stored in data type"},
	{88, "ECANCELED", "operation canceled"},
	{89, "EIDRM", "identifier removed"},
	{90, "ENOMSG", "no message of desired type"},
	{91, "ENOTSUP", "not supported"},
	{92, "EBADMSG", "bad message"},
	{93, "ENOTRECOVERABLE", "state not recoverable"},
	{94, "EOWNERDEAD", "previous owner died"},
	{95, "ELAST", "protocol error"},
}

// Signal table