The benefit of raising an exception over returning a value will be more evident in the section about Dependencies and Security.

In this example, when the client requests an item by an ID that doesn't exist, raise an exception with a status code of `404`:

pkg go/types, type Config struct, Context *Context
pkg go/types, type Config struct, GoVersion string
pkg go/types, type Context struct
pkg go/types, type Info struct, Instances map[*ast.Ident]Instance
pkg go/types, type Instance struct
pkg go/types, type Instance struct, Type Type
pkg go/types, type Instance struct, TypeArgs *TypeList
pkg go/types, type Term struct
pkg go/types, type TypeList struct

pkg go/types, method (*Func) Pos() token.Pos
pkg go/types, method (*Func) Scope() *Scope
pkg go/types, method (*Func) String() string
pkg go/types, method (*Func) Type() Type
pkg go/types, method (*Info) ObjectOf(*ast.Ident) Object
pkg go/types, method (*Info) TypeOf(ast.Expr) Type
pkg go/types, method (*Initializer) String() string
pkg go/types, method (*Interface) Complete() *Interface
pkg go/types, method (*Interface) Embedded(int) *Named

}

func ExampleLastIndex() {
	fmt.Println(bytes.Index([]byte("go gopher"), []byte("go")))
	fmt.Println(bytes.LastIndex([]byte("go gopher"), []byte("go")))
	fmt.Println(bytes.LastIndex([]byte("go gopher"), []byte("rodent")))
	// Output:
	// 0
	// 3
	// -1
}

func ExampleLastIndexAny() {
	fmt.Println(bytes.LastIndexAny([]byte("go gopher"), "MüQp"))
	fmt.Println(bytes.LastIndexAny([]byte("go 地鼠"), "地大"))

115C1..115C9  ; valid                  ;      ; NV8    # 7.0  SIDDHAM SIGN SIDDHAM..SIDDHAM END OF TEXT MARK
115CA..115D7  ; valid                  ;      ; NV8    # 8.0  SIDDHAM SECTION MARK WITH TRIDENT AND U-SHAPED ORNAMENTS..SIDDHAM SECTION MARK WITH CIRCLES AND FOUR ENCLOSURES
115D8..115DD  ; valid                                  # 8.0  SIDDHAM LETTER THREE-CIRCLE ALTERNATE I..SIDDHAM VOWEL SIGN ALTERNATE UU

				if strings.HasPrefix(c.Text, "// Deprecated:") {
					return true
				}
			}
		}
		return false
	}

	w.deprecated = make(map[token.Pos]bool)
	mark := func(id *ast.Ident) {
		if id != nil {
			w.deprecated[id.Pos()] = true
		}
	}
	for _, file := range w.current.Files {
		ast.Inspect(file, func(n ast.Node) bool {
			switch n := n.(type) {
			case *ast.File:

pkg syscall (openbsd-amd64), type FdSet struct, Bits [32]int32
pkg syscall (openbsd-amd64), type Kevent_t struct, Data int32
pkg syscall (openbsd-amd64), type Kevent_t struct, Ident uint32
pkg syscall (openbsd-amd64), type Mclpool struct, Grown uint32
pkg syscall (openbsd-amd64), type RtMetrics struct, Expire uint32
pkg syscall (openbsd-amd64), type Stat_t struct, Ino uint32

<code>$foo(SB)</code> (absolute address).
The assembler also supports some (not necessarily all) addressing modes
specific to each architecture.
The sections below list these.
</p>

<p>
One detail evident in the examples from the previous sections is that data in the instructions flows from left to right:
<code>MOVQ</code> <code>$0,</code> <code>CX</code> clears <code>CX</code>.

pkg go/ast, method (*GoStmt) End() token.Pos
pkg go/ast, method (*GoStmt) Pos() token.Pos
pkg go/ast, method (*Ident) End() token.Pos
pkg go/ast, method (*Ident) IsExported() bool
pkg go/ast, method (*Ident) Pos() token.Pos
pkg go/ast, method (*Ident) String() string
pkg go/ast, method (*IfStmt) End() token.Pos
pkg go/ast, method (*IfStmt) Pos() token.Pos

pkg syscall (openbsd-amd64), type FdSet struct, Bits [32]uint32
pkg syscall (openbsd-amd64), type Kevent_t struct, Data int64
pkg syscall (openbsd-amd64), type Kevent_t struct, Ident uint64
pkg syscall (openbsd-amd64), type Mclpool struct, Grown int32
pkg syscall (openbsd-amd64), type RtMetrics struct, Expire int64
pkg syscall (openbsd-amd64), type RtMetrics struct, Pad uint32