switch call.Fun.(type) {
			case *ast.IndexExpr, *ast.IndexListExpr:
				ix := typeparams.UnpackIndexExpr(call.Fun)
				check.versionErrorf(inNode(call.Fun, ix.Lbrack), go1_18, "function instantiation")
			default:
				check.versionErrorf(inNode(call, call.Lparen), go1_18, "implicit function instantiation")
			}
		}
		// rename type parameters to avoid problems with recursive calls
		var tmp Type

func argErrPos(call *ast.CallExpr) positioner { return inNode(call, call.Rparen) }

// startPos returns the start position of node n.
func startPos(n ast.Node) token.Pos { return n.Pos() }

// endPos returns the position of the first character immediately after node n.
func endPos(n ast.Node) token.Pos { return n.End() }

	{50, "ENOCSI", "no CSI structure available"},
	{51, "EL2HLT", "level 2 halted"},
	{52, "EBADE", "invalid exchange"},
	{53, "EBADR", "invalid request descriptor"},
	{54, "EXFULL", "exchange full"},
	{55, "ENOANO", "no anode"},
	{56, "EBADRQC", "invalid request code"},
	{57, "EBADSLT", "invalid slot"},
	{59, "EBFONT", "bad font file format"},
	{60, "ENOSTR", "device not a stream"},
	{61, "ENODATA", "no data available"},

)

const (
	LO_FLAGS_READ_ONLY = 0x1
	LO_FLAGS_AUTOCLEAR = 0x4
	LO_FLAGS_PARTSCAN  = 0x8
	LO_FLAGS_DIRECT_IO = 0x10
)

type LoopInfo64 struct {
	Device           uint64
	Inode            uint64
	Rdevice          uint64
	Offset           uint64
	Sizelimit        uint64
	Number           uint32
	Encrypt_type     uint32
	Encrypt_key_size uint32
	Flags            uint32

	{50, "ENOCSI", "no CSI structure available"},
	{51, "EL2HLT", "level 2 halted"},
	{52, "EBADE", "invalid exchange"},
	{53, "EBADR", "invalid request descriptor"},
	{54, "EXFULL", "exchange full"},
	{55, "ENOANO", "no anode"},
	{56, "EBADRQC", "invalid request code"},
	{57, "EBADSLT", "invalid slot"},
	{59, "EBFONT", "bad font file format"},
	{60, "ENOSTR", "device not a stream"},
	{61, "ENODATA", "no data available"},

	47:  "operation canceled",
	48:  "operation not supported",
	49:  "disc quota exceeded",
	50:  "bad exchange descriptor",
	51:  "bad request descriptor",
	52:  "message tables full",
	53:  "anode table overflow",
	54:  "bad request code",
	55:  "invalid slot",
	56:  "file locking deadlock",
	57:  "bad font file format",
	58:  "owner of the lock died",
	59:  "lock is not recoverable",

			// that the lhs expression type is determined in the
			// first round and thus deleted from the map, and then
			// not found in the second round (double insertion of
			// the same expr node still just leads to one entry for
			// that node, and it can only be deleted once).
			// Be cautious and check for presence of entry.
			// Example: var e, f = int(1<<""[f]) // go.dev/issue/11347
			if info, found := check.untyped[x.expr]; found {

		default:
			check.errorf(&x, NotAType, "%s is not a type", &x)
		}

	case *ast.IndexExpr, *ast.IndexListExpr:
		ix := typeparams.UnpackIndexExpr(e)
		check.verifyVersionf(inNode(e, ix.Lbrack), go1_18, "type instantiation")
		return check.instantiatedType(ix, def)

	case *ast.ParenExpr:
		// Generic types must be instantiated before they can be used in any form.

	{50, "ENOCSI", "no CSI structure available"},
	{51, "EL2HLT", "level 2 halted"},
	{52, "EBADE", "invalid exchange"},
	{53, "EBADR", "invalid request descriptor"},
	{54, "EXFULL", "exchange full"},
	{55, "ENOANO", "no anode"},
	{56, "EBADRQC", "invalid request code"},
	{57, "EBADSLT", "invalid slot"},
	{59, "EBFONT", "bad font file format"},
	{60, "ENOSTR", "device not a stream"},
	{61, "ENODATA", "no data available"},

		panic(walkContinue)
	case *parse.IfNode:
		s.walkIfOrWith(parse.NodeIf, dot, node.Pipe, node.List, node.ElseList)
	case *parse.ListNode:
		for _, node := range node.Nodes {
			s.walk(dot, node)
		}
	case *parse.RangeNode:
		s.walkRange(dot, node)
	case *parse.TemplateNode:
		s.walkTemplate(dot, node)
	case *parse.TextNode:
		if _, err := s.wr.Write(node.Text); err != nil {
			s.writeError(err)
		}