How to use Panic method of got Package

1package main2// Tests of composite literals.3import "fmt"4// Map literals.5func init() {6	type M map[int]int7	m1 := []*M{{1: 1}, &M{2: 2}}8	want := "map[1:1] map[2:2]"9	if got := fmt.Sprint(*m1[0], *m1[1]); got != want {10		panic(got)11	}12	m2 := []M{{1: 1}, M{2: 2}}13	if got := fmt.Sprint(m2[0], m2[1]); got != want {14		panic(got)15	}16}17// Nonliteral keys in composite literal.18func init() {19	const zero int = 120	var v = []int{1 + zero: 42}21	if x := fmt.Sprint(v); x != "[0 0 42]" {22		panic(x)23	}24}25// Test for in-place initialization.26func init() {27	// struct28	type S struct {29		a, b int30	}31	s := S{1, 2}32	s = S{b: 3}33	if s.a != 0 {34		panic("s.a != 0")35	}36	if s.b != 3 {37		panic("s.b != 3")38	}39	s = S{}40	if s.a != 0 {41		panic("s.a != 0")42	}43	if s.b != 0 {44		panic("s.b != 0")45	}46	// array47	type A [4]int48	a := A{2, 4, 6, 8}49	a = A{1: 6, 2: 4}50	if a[0] != 0 {51		panic("a[0] != 0")52	}53	if a[1] != 6 {54		panic("a[1] != 6")55	}56	if a[2] != 4 {57		panic("a[2] != 4")58	}59	if a[3] != 0 {60		panic("a[3] != 0")61	}62	a = A{}63	if a[0] != 0 {64		panic("a[0] != 0")65	}66	if a[1] != 0 {67		panic("a[1] != 0")68	}69	if a[2] != 0 {70		panic("a[2] != 0")71	}72	if a[3] != 0 {73		panic("a[3] != 0")74	}75}76// Regression test for https://github.com/golang/go/issues/10127:77// composite literal clobbers destination before reading from it.78func init() {79	// map80	{81		type M map[string]int82		m := M{"x": 1, "y": 2}83		m = M{"x": m["y"], "y": m["x"]}84		if m["x"] != 2 || m["y"] != 1 {85			panic(fmt.Sprint(m))86		}87		n := M{"x": 3}88		m, n = M{"x": n["x"]}, M{"x": m["x"]} // parallel assignment89		if got := fmt.Sprint(m["x"], n["x"]); got != "3 2" {90			panic(got)91		}92	}93	// struct94	{95		type T struct{ x, y, z int }96		t := T{x: 1, y: 2, z: 3}97		t = T{x: t.y, y: t.z, z: t.x} // all fields98		if got := fmt.Sprint(t); got != "{2 3 1}" {99			panic(got)100		}101		t = T{x: t.y, y: t.z + 3} // not all fields102		if got := fmt.Sprint(t); got != "{3 4 0}" {103			panic(got)104		}105		u := T{x: 5, y: 6, z: 7}106		t, u = T{x: u.x}, T{x: t.x} // parallel assignment107		if got := fmt.Sprint(t, u); got != "{5 0 0} {3 0 0}" {108			panic(got)109		}110	}111	// array112	{113		a := [3]int{0: 1, 1: 2, 2: 3}114		a = [3]int{0: a[1], 1: a[2], 2: a[0]} //  all elements115		if got := fmt.Sprint(a); got != "[2 3 1]" {116			panic(got)117		}118		a = [3]int{0: a[1], 1: a[2] + 3} //  not all elements119		if got := fmt.Sprint(a); got != "[3 4 0]" {120			panic(got)121		}122		b := [3]int{0: 5, 1: 6, 2: 7}123		a, b = [3]int{0: b[0]}, [3]int{0: a[0]} // parallel assignment124		if got := fmt.Sprint(a, b); got != "[5 0 0] [3 0 0]" {125			panic(got)126		}127	}128	// slice129	{130		s := []int{0: 1, 1: 2, 2: 3}131		s = []int{0: s[1], 1: s[2], 2: s[0]} //  all elements132		if got := fmt.Sprint(s); got != "[2 3 1]" {133			panic(got)134		}135		s = []int{0: s[1], 1: s[2] + 3} //  not all elements136		if got := fmt.Sprint(s); got != "[3 4]" {137			panic(got)138		}139		t := []int{0: 5, 1: 6, 2: 7}140		s, t = []int{0: t[0]}, []int{0: s[0]} // parallel assignment141		if got := fmt.Sprint(s, t); got != "[5] [3]" {142			panic(got)143		}144	}145}146// Regression test for https://github.com/golang/go/issues/13341:147// within a map literal, if a key expression is a composite literal,148// Go 1.5 allows its type to be omitted.  An & operation may be implied.149func init() {150	type S struct{ x int }151	// same as map[*S]bool{&S{x: 1}: true}152	m := map[*S]bool{{x: 1}: true}153	for s := range m {154		if s.x != 1 {155			panic(s) // wrong key156		}157		return158	}159	panic("map is empty")160}161func main() {162}...

1import "fmt"2func main() {3	defer func() {4		str := recover()5		fmt.Println(str)6	}()7	panic("PANIC")8}

1import (2func main() {3	_, err := os.Create("/tmp/file")4	if err != nil {5		panic(err)6	}7	fmt.Println("file created")8}

1import "fmt"2func main() {3	fmt.Println("Starting the application...")4	panic("A severe error occurred: stopping the application!")5	fmt.Println("Ending the application...")6}

1import (2func main() {3	fmt.Println("Starting the application...")4	_, err := sqrt(-10)5	if err != nil {6		log.Fatalln(err)7	}8	fmt.Println("Ending the application...")9}10func sqrt(f float64) (float64, error) {11	if f < 0 {12		return 0, fmt.Errorf("norgate math: square root of negative number: %v", f)13	}14}

1import "fmt"2func main() {3	fmt.Println("Hello World")4	panic("Panic")5	fmt.Println("Hello World")6}7import "fmt"8func main() {9	fmt.Println("Hello World")10	defer func() {11		str := recover()12		fmt.Println(str)13	}()14	panic("Panic")15	fmt.Println("Hello World")16}

1import "fmt"2func main() {3	fmt.Println("Hello, playground")4	panic("A server error occurred: stopping the program!")5	fmt.Println("This will not get printed")6}

1import (2func main() {3	fmt.Println("This is a test")4	log.Panic("This is a Panic message")5	fmt.Println("This is a test")6}

1import (2func main() {3	fmt.Println("Hello, playground")4	panic("Panic")5	fmt.Println("Panic is over")6}