"one": 10,
	}

	maps.Copy(m2, m1)
	fmt.Println("m2 is:", m2)

	m2["one"] = 100
	fmt.Println("m1 is:", m1)
	fmt.Println("m2 is:", m2)

	m3 := map[string][]int{
		"one": {1, 2, 3},
		"two": {4, 5, 6},
	}
	m4 := map[string][]int{
		"one": {7, 8, 9},
	}

	maps.Copy(m4, m3)
	fmt.Println("m4 is:", m4)

	m4["one"][0] = 100
	fmt.Println("m3 is:", m3)
	fmt.Println("m4 is:", m4)

	// Output:

// package comment
package main

import (
	"fmt"
	"math"
	"log"
	"errors"
	"io"
)

import (
	"fmt"

	"math"

	"log"

	"errors"

	"io"
)

// We reset the line numbering to test that
// the formatting works independent of line directives
//line :19

import (
	"fmt"
	"math"
	"log"
	"errors"
	"io"

	"fmt"

	"math"

	"log"

	"errors"

package main

import "fmt"

// We are going to define 256 types T(n),
// such that T(n) embeds T(2n) and *T(2n+1).

func main() {
	fmt.Printf("// errorcheck\n\n")
	fmt.Printf("package p\n\n")
	fmt.Println(`import "unsafe"`)

	// Dump types.
	for n := 1; n < 256; n++ {
		writeStruct(n)
	}
	// Dump leaves
	for n := 256; n < 512; n++ {
		fmt.Printf("type T%d int\n", n)
	}

	fmt.Printf("var t T1\n")

	// The package also accepts the incorrect but common prefix u for micro.
	micro2, _ := time.ParseDuration("1us")

	fmt.Println(hours)
	fmt.Println(complex)
	fmt.Printf("There are %.0f seconds in %v.\n", complex.Seconds(), complex)
	fmt.Printf("There are %d nanoseconds in %v.\n", micro.Nanoseconds(), micro)
	fmt.Printf("There are %6.2e seconds in %v.\n", micro2.Seconds(), micro2)
	// Output:
	// 10h0m0s
	// 1h10m10s

	writeHeader(&buf)
	fmt.Fprintf(&buf, "package buildcfg\n")
	fmt.Fprintln(&buf)
	fmt.Fprintf(&buf, "import \"runtime\"\n")
	fmt.Fprintln(&buf)
	fmt.Fprintf(&buf, "const defaultGO386 = `%s`\n", go386)
	fmt.Fprintf(&buf, "const defaultGOAMD64 = `%s`\n", goamd64)
	fmt.Fprintf(&buf, "const defaultGOARM = `%s`\n", goarm)
	fmt.Fprintf(&buf, "const defaultGOARM64 = `%s`\n", goarm64)

			for _, x := range inputs {
				code := fmt.Sprintf("%s_to_%s(%s)", t1, t2, x)
				fmt.Fprintf(&prog, "\tv%d = %s\n", len(outputs), code)
				exprs = append(exprs, code)
				outputs = append(outputs, convert(x, t1, t2))
			}
		}
	}
	fmt.Fprintf(&prog, ")\n\n")
	fmt.Fprintf(&prog, "func main() {\n\tok := true\n")
	for i, out := range outputs {

		if err != nil {
			log.Fatal(err)
		}

		fmt.Printf("%v: %v\n", m.Name, m.Text)
	}

	// read closing bracket
	t, err = dec.Token()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%T: %v\n", t, t)

	// Output:
	// json.Delim: [
	// Ed: Knock knock.
	// Sam: Who's there?
	// Ed: Go fmt.
	// Sam: Go fmt who?
	// Ed: Go fmt yourself!
	// json.Delim: ]
}

	// the fmt package recognizes it as an implementation of fmt.Scanner.
	i := new(big.Int)
	_, err := fmt.Sscan("18446744073709551617", i)
	if err != nil {
		log.Println("error scanning value:", err)
	} else {
		fmt.Println(i)
	}
	// Output: 18446744073709551617
}

func ExampleFloat_Scan() {
	// The Scan function is rarely used directly;
	// the fmt package recognizes it as an implementation of fmt.Scanner.

		fmt.Fprintf(os.Stderr, "  \tmerges data from input directories dir1+dir2\n")
		fmt.Fprintf(os.Stderr, "  \tand emits percentage of statements covered\n\n")
	case funcMode:
		fmt.Fprintf(os.Stderr, "  go tool covdata func -i=dir1,dir2\n\n")
		fmt.Fprintf(os.Stderr, "  \treads coverage data files from dir1+dirs2\n")
		fmt.Fprintf(os.Stderr, "  \tand writes out coverage profile data for\n")
		fmt.Fprintf(os.Stderr, "  \teach function.\n")

package sort_test

import (
	"fmt"
	"math"
	"sort"
)

func ExampleInts() {
	s := []int{5, 2, 6, 3, 1, 4} // unsorted
	sort.Ints(s)
	fmt.Println(s)
	// Output: [1 2 3 4 5 6]
}

func ExampleIntsAreSorted() {
	s := []int{1, 2, 3, 4, 5, 6} // sorted ascending
	fmt.Println(sort.IntsAreSorted(s))

	s = []int{6, 5, 4, 3, 2, 1} // sorted descending
	fmt.Println(sort.IntsAreSorted(s))