Update go version

vendor/honnef.co/go/tools/internal/xtools-internal/astutil/unpack.go

@@ -0,0 +1,61 @@
+// Copyright 2023 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.
+
+package astutil
+
+import (
+	"go/ast"
+
+	"honnef.co/go/tools/internal/xtools-internal/typeparams"
+)
+
+// UnpackRecv unpacks a receiver type expression, reporting whether it is a
+// pointer receiver, along with the type name identifier and any receiver type
+// parameter identifiers.
+//
+// Copied (with modifications) from go/types.
+func UnpackRecv(rtyp ast.Expr) (ptr bool, rname *ast.Ident, tparams []*ast.Ident) {
+L: // unpack receiver type
+	// This accepts invalid receivers such as ***T and does not
+	// work for other invalid receivers, but we don't care. The
+	// validity of receiver expressions is checked elsewhere.
+	for {
+		switch t := rtyp.(type) {
+		case *ast.ParenExpr:
+			rtyp = t.X
+		case *ast.StarExpr:
+			ptr = true
+			rtyp = t.X
+		default:
+			break L
+		}
+	}
+
+	// unpack type parameters, if any
+	switch rtyp.(type) {
+	case *ast.IndexExpr, *ast.IndexListExpr:
+		var indices []ast.Expr
+		rtyp, _, indices, _ = typeparams.UnpackIndexExpr(rtyp)
+		for _, arg := range indices {
+			var par *ast.Ident
+			switch arg := arg.(type) {
+			case *ast.Ident:
+				par = arg
+			default:
+				// ignore errors
+			}
+			if par == nil {
+				par = &ast.Ident{NamePos: arg.Pos(), Name: "_"}
+			}
+			tparams = append(tparams, par)
+		}
+	}
+
+	// unpack receiver name
+	if name, _ := rtyp.(*ast.Ident); name != nil {
+		rname = name
+	}
+
+	return
+}