//   ******@****.***

// Complex circular tangent
//
// DESCRIPTION:
//
// If
//     z = x + iy,
//
// then
//
//           sin 2x  +  i sinh 2y
//     w  =  --------------------.
//            cos 2x  +  cosh 2y
//
// On the real axis the denominator is zero at odd multiples
// of PI/2. The denominator is evaluated by its Taylor
// series near these points.
//
// ctan(z) = -i ctanh(iz).
//

		{d: 2*365*24*time.Hour - time.Millisecond, want: "729d"},
		{d: 2 * 365 * 24 * time.Hour, want: "2y"},
		{d: 2*365*24*time.Hour + 23*time.Hour, want: "2y"},
		{d: 2*365*24*time.Hour + 23*time.Hour + 59*time.Minute, want: "2y"},
		{d: 2*365*24*time.Hour + 24*time.Hour - time.Millisecond, want: "2y"},
		{d: 2*365*24*time.Hour + 24*time.Hour, want: "2y1d"},
		{d: 3 * 365 * 24 * time.Hour, want: "3y"},

package level2x

var Value = "1a/2y"
-- level1b/pkg.go --
package level1b

import (
	"test/main/level1b/level2x"
	"test/main/level1b/level2y"
)

func Print() { println(level2x.Value, level2y.Value) }
-- level1b/level2x/pkg.go --
package level2x

var Value = "1b/2x"
-- level1b/level2y/pkg.go --
package level2x

# The content of files should affect caching, provided that the mtime also changes.
exec ./mkold$GOEXE 1m testcache/file.txt
go test testcache -run=FileContent
go test testcache -run=FileContent
stdout '\(cached\)'
cp 2y.txt testcache/file.txt
exec ./mkold$GOEXE 50s testcache/file.txt
go test testcache -run=FileContent
! stdout '\(cached\)'
go test testcache -run=FileContent
stdout '\(cached\)'

	if x < 0 {
		x = -x
		sign = true
	}
	if y < 0 {
		y = -y
	}
	if x == y {
		if sign {
			zero := 0.0
			return -zero
		}
		return 0
	}
	if y <= HalfMax {
		x = Mod(x, y+y) // now x < 2y
	}
	if y < Tiny {
		if x+x > y {
			x -= y
			if x+x >= y {
				x -= y
			}
		}
	} else {
		yHalf := 0.5 * y
		if x > yHalf {
			x -= y
			if x >= yHalf {
				x -= y
			}
		}
	}

00000060  79 bf ad 63 e3 11 2b d0  41 0e 24 85 92 c4 9b b5  |y..c..+.A.$.....|
00000070  b2 d3 2e fc aa 46 84 85  a7 37 90 fc f0 2b 5a 7e  |.....F...7...+Z~|
00000080  28 9f 2e 57 1d 8f c3 ca  eb 40 32 79 af 4b b8 28  |(..W.....@2y.K.(|
00000090  15 03 03 00 30 00 00 00  00 00 00 00 00 00 00 00  |....0...........|
000000a0  00 00 00 00 00 8b 6c 27  b8 ff f9 ea ca 68 75 54  |......l'.....huT|

00000000  16 03 03 00 5d 02 00 00  59 03 03 8f cc 68 50 60  |....]...Y....hP`|
00000010  11 c8 c3 ce e7 e9 e1 3c  fb 29 d7 4f df 44 16 65  |.......<.).O.D.e|
00000020  1d 3b 25 5b 32 59 f1 8e  be d8 49 20 c2 89 a7 d5  |.;%[2Y....I ....|
00000030  cb 2c a2 05 19 6b 65 64  9b 71 2b d3 d2 19 cb 66  |.,...ked.q+....f|
00000040  61 c1 6f 19 b4 7a 15 41  76 14 85 fc c0 27 00 00  |a.o..z.Av....'..|

00000340  8e 7f 52 d3 b8 14 03 03  00 11 82 73 be a9 08 9d  |..R........s....|
00000350  5b 2f fe bd 1f 2c fb e2  f3 94 f3 16 03 03 00 20  |[/...,......... |
00000360  d0 47 0f 2d 7e ce 8f 01  e2 7d 01 3c 32 79 a0 26  |.G.-~....}.<2y.&|
00000370  fe 00 ce d3 37 46 20 b4  f8 af 21 81 0f 1e ba 2d  |....7F ...!....-|
>>> Flow 10 (server to client)
00000000  14 03 03 00 11 53 7f 72  ce 10 f4 0e a3 ed ed 8d  |.....S.r........|

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	{complex(zero, zero),
		complex(zero, zero)},
	{complex(1.0, inf),
		NaN()},
	{complex(1.0, nan),
		NaN()},
	{complex(inf, 1.0),
		complex(1.0, math.Copysign(0.0, math.Sin(2*1.0)))}, // 1 + i 0 sin(2y)
	{complex(inf, inf),
		complex(1.0, zero)}, // imaginary sign unspecified
	{complex(inf, nan),
		complex(1.0, zero)}, // imaginary sign unspecified
	{complex(nan, zero),
		complex(nan, zero)},