# 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 '\(cached\)'

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........|

 * Cost: 4M + 4S + 1*half + 5add + 2*2 + 1*3.
 * Source: 2004 Hankerson–Menezes–Vanstone, page 91.
 * 	A  = 3(X₁-Z₁²)×(X₁+Z₁²)
 * 	B  = 2Y₁
 * 	Z₃ = B×Z₁
 * 	C  = B²
 * 	D  = C×X₁
 * 	X₃ = A²-2D
 * 	Y₃ = (D-X₃)×A-C²/2
 *
 * Three-operand formula:
 *       T1 = Z1²
 *       T2 = X1-T1
 *       T1 = X1+T1

 * Cost: 4M + 4S + 1*half + 5add + 2*2 + 1*3.
 * Source: 2004 Hankerson–Menezes–Vanstone, page 91.
 * 	A  = 3(X₁-Z₁²)×(X₁+Z₁²)
 * 	B  = 2Y₁
 * 	Z₃ = B×Z₁
 * 	C  = B²
 * 	D  = C×X₁
 * 	X₃ = A²-2D
 * 	Y₃ = (D-X₃)×A-C²/2
 *
 * Three-operand formula:
 *       T1 = Z1²
 *       T2 = X1-T1
 *       T1 = X1+T1