_	= 0x_1234P-10

	_	= 0X_dead_cafe.p-10
	_	= 0x12_34.P1_2_3
	_	= 0X1_2_3_4.P-1_2_3

	// imaginaries
	_	= 0i
	_	= 00i
	_	= 08i
	_	= 0000000000i
	_	= 0123i
	_	= 0000000123i
	_	= 0000056789i
	_	= 1234i
	_	= 1234567i

	_	= 0i
	_	= 0_0i
	_	= 0_8i
	_	= 0_000_000_000i
	_	= 0_123i
	_	= 0_000_000_123i
	_	= 0_000_056_789i
	_	= 1_234i
	_	= 1_234_567i

00000000  14 03 03 00 01 01 16 03  03 00 20 03 84 99 6b f7  |.......... ...k.|
00000010  3e 44 b1 96 6a 09 75 bf  26 4b 67 30 c4 e9 86 74  |>D..j.u.&Kg0...t|
00000020  4d e1 e3 9b fa 15 8e 1e  72 f9 5a                 |M.......r.Z|
>>> Flow 5 (client to server)
00000000  17 03 03 00 16 68 29 2f  1b 1c 9d 28 6e b6 e5 09  |.....h)/...(n...|
00000010  4a 77 96 23 20 da 67 9e  14 ec 6b                 |Jw.# .g...k|
>>> Flow 6 (server to client)

00000130  40                                                |@|
>>> Flow 3 (client to server)
00000000  14 03 03 00 01 01 16 03  03 00 40 46 34 b3 97 54  |..........@F4..T|
00000010  20 5b 95 f3 22 f8 a1 89  c8 95 93 ba 7b a4 a8 8f  | [..".......{...|
00000020  46 a8 d6 c1 b3 ac f0 e0  49 3d 8d e4 1c ac b8 a4  |F.......I=......|
00000030  01 21 5e d8 f0 f5 10 10  f7 de 8b 33 9d 94 cf f6  |.!^........3....|

	diff(t, buf.Bytes(), src)
}

// Node is documented to not modify the AST.
// Test that it is so even when numbers are normalized.
func TestNodeNoModify(t *testing.T) {
	const (
		src    = "package p\n\nconst _ = 0000000123i\n"
		golden = "package p\n\nconst _ = 123i\n"
	)

	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "", src, parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}

	// SHA-3 and SHAKE functions by appending bitstrings to the message.
	// Using a little-endian bit-ordering convention, these are "01" for SHA-3
	// and "1111" for SHAKE, or 00000010b and 00001111b, respectively. Then the
	// padding rule from section 5.1 is applied to pad the message to a multiple
	// of the rate, which involves adding a "1" bit, zero or more "0" bits, and

00000350  03 03 00 04 0e 00 00 00                           |........|
>>> Flow 3 (client to server)
00000000  16 03 03 00 25 10 00 00  21 20 35 e6 c9 e2 76 cf  |....%...! 5...v.|
00000010  36 af dc 27 30 6b eb f4  ae 62 f1 f4 40 81 04 d2  |6..'0k...b..@...|
00000020  f1 c7 d5 af 7d 64 ef 64  d0 58 14 03 03 00 01 01  |....}d.d.X......|
00000030  16 03 03 00 20 5b 64 ec  49 29 26 ba 8c ed 85 fb  |.... [d.I)&.....|

>>> Flow 3 (client to server)
00000000  16 03 03 00 25 10 00 00  21 20 2f e5 7d a3 47 cd  |....%...! /.}.G.|
00000010  62 43 15 28 da ac 5f bb  29 07 30 ff f6 84 af c4  |bC.(.._.).0.....|
00000020  cf c2 ed 90 99 5f 58 cb  3b 74 14 03 03 00 01 01  |....._X.;t......|
00000030  16 03 03 00 20 cf f9 90  26 e8 2c 00 99 ae 0e e6  |.... ...&.,.....|
00000040  a8 d9 66 6b 23 e7 c9 73  1c f7 e9 af e1 71 1d f3  |..fk#..s.....q..|

>>> Flow 1 (client to server)
00000000  16 03 01 00 7d 01 00 00  79 03 03 26 b5 ad b7 ec  |....}...y..&....|
00000010  e9 2f d5 cc 9e c2 f6 6f  dd ab c5 4b 2c 74 48 a5  |./.....o...K,tH.|
00000020  9c c5 21 41 fd 32 91 04  8f 1b 6c 00 00 04 cc a8  |..!A.2....l.....|
00000030  00 ff 01 00 00 4c 00 0b  00 04 03 00 01 02 00 0a  |.....L..........|
00000040  00 04 00 02 00 17 00 16  00 00 00 17 00 00 00 0d  |................|

00000010  75 a0 bb b4 fd 86 8d 74  40 7e 0d e9 a5 95 d0 2d  |u......t@~.....-|
00000020  ca eb 12 2f 7b 09 22 7c  8e bf da 97 18 d9 bd 74  |.../{."|.......t|
00000030  cd 08 6b                                          |..k|
>>> Flow 5 (client to server)
00000000  17 03 03 00 1e 00 00 00  00 00 00 00 01 44 26 54  |.............D&T|
00000010  a3 37 94 7a 3d 93 6a 06  35 fe 9a d4 7b 54 ab d4  |.7.z=.j.5...{T..|

00000010  0b 2f 67 8a 97 fa 17 24  81 e5 6f 5b 09 90 72 8d  |./g....$..o[..r.|
00000020  48 59 14 00 34 e8 3c 82  b8 2f 87                 |HY..4.<../.|
>>> Flow 5 (client to server)
00000000  17 03 03 00 16 f6 cf b1  93 64 54 56 f3 35 3d 8f  |.........dTV.5=.|
00000010  31 5e 66 62 56 aa e9 81  47 4c 8b 15 03 03 00 12  |1^fbV...GL......|