for g := 0; g < 256; g += 5 {
			for b := 0; b < 256; b += 3 {
				r0, g0, b0 := uint8(r), uint8(g), uint8(b)
				y, cb, cr := RGBToYCbCr(r0, g0, b0)
				r1, g1, b1 := YCbCrToRGB(y, cb, cr)
				if delta(r0, r1) > 2 || delta(g0, g1) > 2 || delta(b0, b1) > 2 {
					t.Fatalf("\nr0, g0, b0 = %d, %d, %d\ny,  cb, cr = %d, %d, %d\nr1, g1, b1 = %d, %d, %d",
						r0, g0, b0, y, cb, cr, r1, g1, b1)
				}
			}
		}
	}
}

		panic(fmt.Sprintf("f2() == %d, %d, want %d, %d", got1, got2, want, want))
	}
}

var x interface {
	g0()
	g1() int
	g2() (int, int)
} = s[int]{a: 7}
var y interface{} = s[int]{a: 7}

func interfaceMethods() {
	x.g0()
	is7(x.g1())
	is77(x.g2())
	y.(interface{ g0() }).g0()
	is7(y.(interface{ g1() int }).g1())
	is77(y.(interface{ g2() (int, int) }).g2())
}

}

var x interface {
	g0()
	g1() int
	g2() (int, int)
} = s[int]{a: 7}
var y interface{} = s[int]{a: 7}

func interfaceMethods() {
	x.g0()
	is7(x.g1())
	is77(x.g2())
	y.(interface{ g0() }).g0()
	is7(y.(interface{ g1() int }).g1())
	is77(y.(interface{ g2() (int, int) }).g2())
}

// Also check for instantiations outside functions.
var gg0 = g0[int]
var gg1 = g1[int]
var gg2 = g2[int]

	gp := getg()
	if gp != gp.m.g0 {
		throw("notetsleep not on g0")
	}
	semacreate(gp.m)
	return notetsleep_internal(n, ns, nil, 0)
}

// same as runtime·notetsleep, but called on user g (not g0)
// calls only nosplit functions between entersyscallblock/exitsyscall.
func notetsleepg(n *note, ns int64) bool {
	gp := getg()
	if gp == gp.m.g0 {
		throw("notetsleepg on g0")
	}
	semacreate(gp.m)

	MOVD	fakePC+24(FP), R8
	// Save the original return address in a local variable
	MOVD	R30, savedRetAddr-8(SP)

	MOVD	g_m(g), R10

	// Switch to g0 stack.
	MOVD	RSP, R19	// callee-saved, preserved across the CALL
	MOVD	m_g0(R10), R11
	CMP	R11, g
	BEQ	call	// already on g0
	MOVD	(g_sched+gobuf_sp)(R11), R12
	MOVD	R12, RSP
call:
	// Load address of the ret sled into the default register for the return
	// address.

        when:
        def g2 = subject.group(2)
        def g0 = subject.group(0)
        def g1 = subject.group(1)

        then:
        subject.allGroups == [g0, g1, g2]
    }

    def 'returns the same group for the same ordinal'() {
        given:
        def subject = new OrdinalGroupFactory()

        when:
        def g0 = subject.group(0)
        def g1 = subject.group(1)

        then:

PACKAGE issue13742

IMPORTPATH
	testdata/issue13742

IMPORTS
	go/ast

FILENAMES
	testdata/issue13742.go

FUNCTIONS
	// Both F0 and G0 should appear as functions. 
	func F0(Node)

	// Both F1 and G1 should appear as functions. 
	func F1(ast.Node)

	// 
	func G0() Node

	// 

PACKAGE issue13742

IMPORTPATH
	testdata/issue13742

IMPORTS
	go/ast

FILENAMES
	testdata/issue13742.go

FUNCTIONS
	// Both F0 and G0 should appear as functions. 
	func F0(Node)

	// Both F1 and G1 should appear as functions. 
	func F1(ast.Node)

	// 
	func G0() Node

	// 

PACKAGE issue13742

IMPORTPATH
	testdata/issue13742

IMPORTS
	go/ast

FILENAMES
	testdata/issue13742.go

FUNCTIONS
	// Both F0 and G0 should appear as functions. 
	func F0(Node)

	// Both F1 and G1 should appear as functions. 
	func F1(ast.Node)

	// 
	func G0() Node

	// 

	JMP	asancall<>(SB)

// Switches SP to g0 stack and calls (AX). Arguments already set.
TEXT	asancall<>(SB), NOSPLIT, $0-0
	get_tls(R12)
	MOVQ	g(R12), R14
	MOVQ	SP, R12		// callee-saved, preserved across the CALL
	CMPQ	R14, $0
	JE	call	// no g; still on a system stack

	MOVQ	g_m(R14), R13
	// Switch to g0 stack.
	MOVQ	m_g0(R13), R10
	CMPQ	R10, R14
	JE	call	// already on g0

	MOVQ	(g_sched+gobuf_sp)(R10), SP
call: