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An(other) algorithm for generating optimal keyboard layouts.

Rust 100.00%

keygen's Introduction

keygen

An(other) algorithm for generating optimal keyboard layouts.

This code follows the simulated annealing method used in Carpalx, but with a different model. Here, we try to maximise comfort by minimising the actions that cause discomfort---stretching or compressing the hand in uncomfortable ways. In addition to the base cost of the key due to its position, we also include:

A penalty for using the same finger twice on different keys. Example (QWERTY): ED/DE, LO. Using the same finger twice is the second slowest thing you can do on a keyboard. An extra penalty is awarded if one of the keys in the combination is in a centre column, since lateral movements are slower.
A penalty for jumping from the top row to the bottom row or from the bottom row to the top row on the same finger. Example: CE, UN. Jumping across the home row is the slowest thing you can do on a keyboard.
A penalty for jumping from top to bottom row or from bottom to top row on consecutive fingers, excluding middle--index. Example: EX. This isn't as bad as jumping the home row on the same finger, but causes your fingers to awkwardly stretch to reach the second key.
A penalty for jumping from top to bottom row or from bottom to top row on the same hand. Such a jump, even if not on the same or consecutive fingers, causes your hands to bend awkwardly.
A penalty for an awkward pinky/ring combination where the pinky reaches above the ring finger. Example: QA/AQ, PL/LP, ZX/XZ. Since the pinky is longer than the ring finger, this causes your hand to awkwardly compress.
A penalty for reversing a roll at the end of the hand, i.e. using the ring, pinky, then middle finger of the same hand. Examples: WAD. Since the movement of the ring finger is partially dependent on that of the middle finger, this motion is particularly tricky and therefore inaccurate. In Dvorak, typing "install" may sometimes result in "instnall" or "insntall" as a result of this dependency.
A penalty for using the same hand four times in a row. Examples: EVER, WERE, LOOK. Using the same hand for too many letters in a row fatigues the hand creates the opportunity for error.
A penalty for alternating hands three times in a row. Examples: WITH, IGHT, WHEN. Alternating too often may cause the timing of the alternation to fall apart, for example resulting in "teh" or "hte" for "the".
A slight penalty for rolling outwards, accompanied by a slight award (negative penalty) for rolling inwards, since a rolling in motion feels more natural than a rolling out motion.

Installing and running

You'll need a recent-ish version of Rust.

Then: cargo run -- run corpus/books.short.txt.

Installing the (upcoming) optimal keyboard layout

If you're crazy enough to want to try this, you're probably smart enough to figure out how to install custom keyboards on your system of choice.

Credits

The simulated annealing algorithm and corpus are taken from Carpalx by Martin Krzywinski.

Other alternate keyboard layouts

mdickens has a good list of them here.

Licence

MIT

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keygen's Issues

Is there a way to specify a mask to fix some keys?

I’m looking for a way to let keygen optimize my layout, but without touching a few keys (e.g. ZXCV, quote, minus…). I think CarpalX allows that kind of masks. Is there such a feature in keygen ?

Giving a quick look at the code, I’ve seen a promising (though unused) LAYOUT_MASK: LayoutShuffleMask and a LAYOUT_MASK_SWAP_OFFSETS, but none of them seems to be what I’m looking for.

I’ve set LAYOUT_MASK_NUM_SWAPPABLE to 28 instead of 33 to keep the thumb keys and punctuation cluster untouched, but I’d like to preserve a specific set of keys, too.

Is there any option I’ve missed ? Otherwise, where should I look if I wanted to implement that ?

possible to use this to test layouts?

I've made a new modified workman layout and i'd like to test it with this analyzer and compare it to the original workman layout and RSTHD. Unfortunately rust completely goes over my head for the time being and i'm not sure where to go with that. Do you have a tip on what to do to get that to work? If I can just cut out the code that iterates through layouts and make it just use my layout that would be good enough.

Since the pinky is longer than the ring finger

Since the pinky is longer than the ring finger ?

Picture please :-)

[QUESTION] How can use multiple CPU to speed up optimization?

Hi. I want to speed up optimization, my PCs are insanely low end and each has only 2 cores.

What do I need to use multiple computers similar to the distcc, icecream compilers?

Thanks!

Carpalx - link in README.md is outdated

The link http://mkweb.bcgsc.ca/carpalx/?simulated_annealing in the README.md doesn't go anywhere. Actually, the whole Website (https://mkweb.bcgsc.ca/) seems to be gone.

Which corpus was used for the results in the blog post?

I'm looking at https://xsznix.wordpress.com/2016/05/16/introducing-the-rsthd-layout/ especially the image: https://xsznix.files.wordpress.com/2016/05/screen-shot-2016-05-17-at-11-21-09.png

And whenever I run the evaluation myself, I get quite different results:

$ cargo run -- run-ref corpus/books.short.txt                                                                                     366ms  Sat 20:53
    Finished dev [optimized + debuginfo] target(s) in 0.01s
     Running `target/debug/keygen run-ref corpus/books.short.txt`
Reference: QWERTY
q w e r t | y u i o p -
a s d f g | h j k l ; '
z x c v b | n m , . /
         |
total: 5262350.875; scaled: 1.7690982722017619
base: 3255646  /  t: 609156; n: 389672.5; e: 272982; h: 211929; r: 180207;
same finger: 776140  /  ed: 107595; un: 66790; de: 49385; rt: 48070; tr: 46840;
long jump hand: 197021  /  in: 40205; on: 21898; ve: 15038; be: 11513; no: 10805;
long jump: 348040  /  ce: 76180; un: 66790; my: 44290; ec: 41740; mu: 22880;
long jump consecutive: 49490  /  ct: 13990; ex: 9790; cr: 9760; o,: 5555; xt: 3165;
pinky/ring twist: 45140  /  pl: 29570; p.: 3810; lp: 3710; -l: 2070; .-: 2020;
roll reversal: 58740  /  eas: 25100; cas: 9920; I'l: 4980; opi: 3280; sad: 2260;
same hand: 130883  /   you: 3627.5;  in : 3549.5; you : 2207.5;  him: 1829.5;  my : 1625;
alternating hand: 269495.5  /   the: 15117; the : 11312.5; and : 10199.5;  and: 9787.5;  tha: 4055;
roll out: 40460.875  /  re: 3399.375; hi: 2489.625; te: 1935.625; ve: 1879.75; wa: 1785.5;
roll in: -70664.5  /  in: -5025.625; , : -5002.5; er: -4440; n : -3959.875; ou: -3636.25;
long jump sandwich: 161259  /  ver: 17826; e c: 11967; but: 8421; , I: 6462; t b: 5577;
twist: 700  /  -kn: 300; nk-: 180; il?: 90; ul?: 90; nko: 20;

Reference: DVORAK
' , . p y | f g c r l /
a o e u i | d h t n s -
; q j k x | b m w v z
         |
total: 2886102.875; scaled: 0.9702506979941807
base: 2155109  /  l: 265701; i: 204018; d: 160494; y: 142581; f: 137799;
same finger: 332725  /  gh: 34610; ki: 27690; e.: 25295; pi: 20610; up: 17845;
long jump hand: 16912  /  bl: 3784; br: 2028; rm: 1415; Mr: 1188; k,: 1090;
long jump: 17570  /  xp: 6150; rv: 5740; ky: 2010; mf: 1690; zl: 560;
long jump consecutive: 7690  /  wr: 3485; lv: 2010; rw: 1165; wf: 660; "Q: 150;
pinky/ring twist: 28680  /  nl: 13120; lv: 4020; "O: 3360; o': 3130; n?: 2740;
roll reversal: 47060  /  rst: 17780; nst: 13480; nsw: 7740; nsc: 3640; ea,: 1160;
same hand: 67944  /  d th: 3103.5; n th: 2843.5; t th: 2483; nd t: 2171; f th: 1864;
alternating hand: 210690  /  , an: 5230.5; ere : 2275; here: 2119; ave : 1634; have: 1477;
roll out: 20407.625  /  ea: 1699.75; yo: 986.25; e,: 981.125; ke: 958.875; pe: 739.875;
roll in: -71652.75  /  th: -7546.875; d : -7299.625; t : -6665.75; s : -5074.75; nd: -4083.75;
long jump sandwich: 49278  /  ver: 17826; f m: 2511; bef: 2499; beg: 2103; mig: 1902;
twist: 3690  /  ke,: 1880; btl: 470; mnl: 330; rtm: 230; wn?: 160;

Reference: COLEMAK
q w f p g | j l u y ; -
a r s t d | h n e i o '
z x c v b | k m , . /
         |
total: 2999968.25; scaled: 1.008529984754227
base: 1868380  /  h: 211929; d: 160494; g: 142815; l: 132850.5; a: 91774;
same finger: 192140  /  e,: 39245; kn: 25540; nk: 18110; y.: 10305; ?": 9080;
long jump hand: 22018  /  my: 4429; y,: 3536; mu: 2288; y.: 2061; l,: 1647;
long jump: 42910  /  y.: 20610; lk: 8080; u,: 5070; lm: 3820; kl: 2490;
long jump consecutive: 25055  /  y,: 17680; xp: 3075; u.: 1590; y?: 1340; .-: 1010;
pinky/ring twist: 5250  /  .-: 2020; -I: 1410; -i: 810; xq: 330; I-: 220;
roll reversal: 421300  /  was: 165360; you: 155240; You: 24380; iou: 14120; car: 13720;
same hand: 155317.5  /   you: 3627.5;  in : 3549.5;  he : 2734.5; you : 2207.5;  him: 1829.5;
alternating hand: 249243.5  /  and : 10199.5;  and: 9787.5;  tha: 4055; d th: 3103.5; t th: 2483;
roll out: 46046.875  /  he: 7694.625; hi: 2489.625; me: 2163.625; wa: 1785.5; le: 1709.375;
roll in: -78894.625  /  e : -10680.125; in: -5025.625; , : -5002.5; n : -3959.875; ou: -3636.25;
long jump sandwich: 42162  /  lik: 4092; fac: 2373; beg: 2103; giv: 1821; mil: 1776;
twist: 9040  /  le.: 4580; key: 1460; me;: 1450; me-: 560; le?: 370;

Reference: QGMLWY
q g m l w | y f u b ; -
d s t n r | i a e o h '
z x c v j | k p , . /
         |
total: 3098157; scaled: 1.0415391002808785
base: 1927780.5  /  i: 204018; r: 180207; w: 173013; y: 142581; l: 132850.5;
same finger: 709525  /  ai: 92120; ay: 72690; ki: 41535; e,: 39245; if: 35740;
long jump hand: 17757  /  up: 3569; y,: 3536; y.: 2061; cl: 1804; pu: 1412;
long jump: 17770  /  u,: 5070; lv: 4020; py: 2460; ky: 2010; yp: 1690;
long jump consecutive: 12735  /  cl: 9020; u.: 1590; .-: 1010; Cl: 420; b,: 285;
pinky/ring twist: 8920  /  o-: 2540; .-: 2020; -o: 1400; o;: 1070; sq: 1040;
roll reversal: 8920  /  Oh,: 4420; eho: 2040; e-b: 860; oh,: 720; ohe: 220;
same hand: 116146  /   of : 5403;  you: 3627.5;  he : 2734.5; you : 2207.5; e of: 1335.5;
alternating hand: 279209.5  /   was: 3919.5; was : 3584; d th: 3103.5; n th: 2843.5; t th: 2483;
roll out: 25358.5  /  nd: 4083.75; ng: 2612.75; nt: 1389.875; fo: 1015.25; ld: 993.875;
roll in: -70529.5  /  e : -10680.125; he: -7694.625; , : -5002.5; ou: -3636.25; ha: -3357.75;
long jump sandwich: 41775  /  com: 8121; . B: 2802; cam: 2580; muc: 2310; y p: 1866;
twist: 2790  /  fe.: 1500; ye.: 280; ke-: 240; pe;: 110; pe-: 110;

Reference: WORKMAN
q d r w b | j f u p ; -
a s h t g | y n e o i '
z x m c v | k l , . /
         |
total: 2824789.125; scaled: 0.949638228061299
base: 1748068  /  l: 132850.5; r: 120138; d: 106996; b: 96960; a: 91774;
same finger: 357685  /  ly: 65280; e,: 39245; kn: 25540; ny: 20810; po: 18325;
long jump hand: 27848  /  ul: 7587; pl: 2957; cr: 1952; lf: 1885; rm: 1415;
long jump: 67590  /  lf: 18850; rm: 14150; Mr: 11880; fl: 10610; u,: 5070;
long jump consecutive: 13890  /  mb: 6145; p,: 3575; u.: 1590; .-: 1010; dm: 775;
pinky/ring twist: 8920  /  o-: 2540; .-: 2020; -o: 1400; o;: 1070; sq: 1040;
roll reversal: 178620  /  had: 95300; mad: 19360; has: 16440; dar: 8560; sam: 6960;
same hand: 142023.5  /   of : 5403; that: 4015.5;  you: 3627.5;  in : 3549.5; you : 2207.5;
alternating hand: 250793  /  and : 10199.5;  and: 9787.5; his : 2986.5;  his: 2260.5;  wit: 2257.5;
roll out: 46211.25  /  th: 7546.875; ha: 3357.75; wa: 1785.5; le: 1709.375; ne: 1508.125;
roll in: -80169.625  /  e : -10680.125; in: -5025.625; , : -5002.5; n : -3959.875; ou: -3636.25;
long jump sandwich: 55920  /  rom: 5496; mor: 5229; ful: 4242; r m: 3504; bac: 2883;
twist: 7390  /  kep: 2100; fe.: 1500; pel: 1070; lep: 720; le-: 680;

Reference: MALTRON
q p y c b | v m u z l =
a n i s f | d t h o r '
, . j g / | ; w k - x
        e |
total: 2438346.625; scaled: 0.8197239035902366
base: 1774648.5  /  l: 265701; d: 160494; b: 96960; a: 91774; ,: 91668;
same finger: 98010  /  n.: 9960; hu: 7265; sc: 7015; tw: 6100; rl: 6000;
long jump hand: 11064  /  y,: 3536; y.: 2061; lk: 808; p,: 715; lw: 591;
long jump: 7790  /  p.: 3810; uk: 1760; m;: 1260; P.: 250; m:: 130;
long jump consecutive: 17270  /  y.: 10305; p,: 3575; -l: 1035; -m: 845; l-: 715;
pinky/ring twist: 137570  /  lo: 79060; ol: 45620; Lo: 7100; -l: 2070; l-: 1430;
roll reversal: 61080  /  hro: 15880; ian: 14060; ork: 11140; pai: 8160; olu: 3220;
same hand: 133608.5  /   to : 6649.5; d th: 3103.5; t th: 2483; ould: 2370; uld : 1793;
alternating hand: 197120.5  /  ere : 2275; here: 2119; he s: 1903.5; ave : 1634; have: 1477;
roll out: 39093  /  th: 7546.875; in: 5025.625; to: 2750.375; or: 2301.125; ho: 1239.875;
roll in: -75151.875  /  d : -7299.625; t : -6665.75; an: -4981.125; ou: -3636.25; r : -2958.125;
long jump sandwich: 20934  /  beg: 2103; m w: 1677; g b: 1449; uck: 1443; . P: 1254;
twist: 15310  /  low: 13530; wol: 900; pig: 470; Pig: 130; gip: 80;

Reference: MTGAP
y p o u - | b d l c k j
i n e a , | m h t s r v
( " ' . _ | ) f w g x
        z |
total: 2399011.375; scaled: 0.8065001706114614
base: 1846372.5  /  o: 179775; d: 160494; y: 142581; u: 99888; b: 96960;
same finger: 144135  /  mb: 18435; tl: 13750; au: 8525; rk: 7165; sc: 7015;
long jump hand: 13885  /  y.: 2061; lf: 1885; gl: 1109; fl: 1061; "Y: 715;
long jump: 23090  /  lw: 5910; wl: 3930; u.: 3180; o': 3130; .-: 2020;
long jump consecutive: 18080  /  gl: 5545; "Y: 3575; xc: 1750; "O: 1680; y?: 1340;
pinky/ring twist: 52630  /  ny: 20810; sk: 11450; ks: 7980; "Y: 7150; y?: 2680;
roll reversal: 71700  /  oin: 23040; ein: 13180; "Yo: 9220; pie: 5600; "Ye: 4840;
same hand: 53389  /  d th: 3103.5; t th: 2483; f th: 1864; s th: 1432; ght : 1360.5;
alternating hand: 183797  /  ere : 2275; here: 2119; ave : 1634; have: 1477; ever: 1370.5;
roll out: 25492.375  /  an: 4981.125; on: 2737.25; en: 2640.75; ai: 1151.5; ay: 908.625;
roll in: -74854.5  /  th: -7546.875; d : -7299.625; t : -6665.75; s : -5074.75; in: -5025.625;
long jump sandwich: 40215  /  d f: 5325; low: 4059; on': 3747; wil: 3372; bef: 2499;
twist: 1080  /  pe.: 500; ye.: 280; ctf: 110; yn': 90; ue?: 50;

Reference: CAPEWELL
. y w d f | j p l u q /
a e r s g | b t n i o -
x z c v ; | k w h , '
         |
total: 2811236.75; scaled: 0.9450821876591603
base: 1867806  /  h: 211929; d: 160494; f: 137799; e: 136491; a: 91774;
same finger: 159825  /  ey: 19440; gs: 11890; ds: 10505; ye: 10235; cr: 9760;
long jump hand: 13172  /  ?": 1816; l,: 1647; hu: 1453; lk: 808; p,: 715;
long jump: 33710  /  ?": 18160; u,: 5070; d;: 2970; ?': 1790; dv: 1560;
long jump consecutive: 21560  /  l,: 8235; hu: 7265; cy: 2510; u': 1730; Hu: 795;
pinky/ring twist: 51550  /  e.: 50590; iq: 270; E.: 220; I?: 200; z.: 130;
roll reversal: 286180  /  ear: 76560; hou: 70140; ion: 69940; eac: 8760; nou: 8460;
same hand: 203304.5  /   to : 6649.5;  in : 3549.5; n th: 2843.5; t th: 2483; with: 2424;
alternating hand: 154783.5  /  and : 10199.5;  and: 9787.5;  for: 2416.5; for : 1939.5; he s: 1903.5;
roll out: 54107.625  /  th: 7546.875; re: 3399.375; to: 2750.375; hi: 2489.625; ve: 1879.75;
roll in: -75915.875  /  t : -6665.75; in: -5025.625; , : -5002.5; er: -4440; n : -3959.875;
long jump sandwich: 30234  /  hal: 3204; hil: 2730; ved: 2277; hol: 2061; hel: 1947;
twist: 10920  /  ce.: 6380; ve.: 1330; unk: 1290; xed: 1250; unw: 250;

Reference: ARENSITO
q l , p  |  f u d k
a r e n b | g s i t o
z w . h j | v c y m x
         |
total: 2431063.75; scaled: 0.8172755450742034
base: 1714782  /  h: 211929; m: 115986; w: 115342; d: 106996; t: 101526;
same finger: 151645  /  e,: 39245; e.: 25295; ok: 19650; gs: 11890; ui: 8225;
long jump hand: 20648  /  ck: 4524; uc: 2912; mu: 2288; dy: 1655; cu: 1423;
long jump: 17480  /  lw: 5910; ph: 4820; wl: 3930; dm: 1550; uy: 400;
long jump consecutive: 37960  /  mu: 11440; dy: 8275; um: 7105; w,: 4960; l.: 4125;
pinky/ring twist: 260  /  km: 120; rq: 100; kt: 30; tk: 10;
roll reversal: 121000  /  ear: 76560; eal: 15440; mou: 8360; dou: 5100; tou: 4480;
same hand: 165880.5  /   to : 6649.5;  of : 5403;  you: 3627.5;  it : 2414.5; you : 2207.5;
alternating hand: 128428.5  /  thin: 1950; ave : 1634; hing: 1629; know: 890.5; ed, : 874;
roll out: 54585.125  /  he: 7694.625; er: 4440; ha: 3357.75; to: 2750.375; it: 2501.375;
roll in: -78214.375  /  d : -7299.625; t : -6665.75; s : -5074.75; an: -4981.125; ou: -3636.25;
long jump sandwich: 77769  /  you: 23286; d m: 7284; low: 4059; You: 3657; wil: 3372;
twist: 18840  /  hel: 6490; Hel: 3200; vid: 2320; fix: 1510; cid: 1450;

Reference: BLAKE
q h o u x | g c r f z
y i e a ; | m s t n b
j , . k / | w d l p v
         |
total: 2594267.375; scaled: 0.872141375548604
base: 1885361.5  /  o: 179775; d: 160494; w: 144177.5; g: 142815; h: 141286;
same finger: 338415  /  hi: 99585; e.: 25295; rt: 24035; tr: 23420; ak: 15035;
long jump hand: 32270  /  ok: 3930; rd: 3835; pr: 3094; lf: 1885; dr: 1845;
long jump: 41220  /  h,: 12200; rl: 12000; o.: 5510; dg: 4920; uk: 1760;
long jump consecutive: 44990  /  pr: 15470; lf: 9425; o,: 5555; fl: 5305; h.: 2790;
pinky/ring twist: 410  /  iq: 270; nz: 130; zn: 10;
roll reversal: 6420  /  ey,: 2640; oy,: 2220; oyi: 480; hy.: 360; eyi: 260;
same hand: 35582.5  /  nd t: 2171; ng t: 1351; nd s: 1255.5; nd w: 1021.5; ll t: 641.5;
alternating hand: 210543.5  /  , an: 5230.5; with: 2424; ere : 2275; ith : 2057.5; ight: 1780;
roll out: 13721.375  /  st: 1985.875; ai: 1151.5; e,: 981.125; ke: 958.875; ay: 908.625;
roll in: -73457.5  /  he: -7694.625; d : -7299.625; t : -6665.75; s : -5074.75; nd: -4083.75;
long jump sandwich: 57501  /  , h: 4446; d c: 4041; d g: 3342; g w: 2223; on.: 2127;
twist: 1290  /  ue,: 800; he?: 330; ftw: 110; xe,: 20; hek: 10;

Reference: INITIAL
j c y f k | z l , u q =
r s t h d | m n a i o '
/ v g p b | x w . ; -
        e |
total: 1955272.25; scaled: 0.6573238541717444
base: 1548681.5  /  d: 160494; l: 132850.5; o: 89887.5; m: 86989.5; w: 86506.5;
same finger: 88285  /  wn: 13635; ty: 10575; ui: 8225; sc: 7015; nl: 6560;
long jump hand: 8019  /  by: 2226; w,: 992; l.: 825; lw: 591; wl: 393;
long jump: 11790  /  lw: 5910; wl: 3930; gy: 890; u;: 280; .,: 220;
long jump consecutive: 2785  /  u.: 1590; vy: 750; -u: 265; u-: 105; .u: 25;
pinky/ring twist: 300  /  iq: 270; sj: 20; Js: 10;
roll reversal: 4100  /  cry: 2540; .-I: 980; io,: 200; aqu: 80; io.: 80;
same hand: 130133.5  /  , an: 5230.5;  in : 3549.5; ther: 2398; here: 2119; all : 1756;
alternating hand: 200134.5  /  hat : 4540.5; his : 2986.5;  for: 2416.5;  his: 2260.5;  had: 2197.5;
roll out: 23517.5  /  wa: 1785.5; no: 1350.625; ai: 1151.5; li: 1139.625; wi: 1010.875;
roll in: -93285.75  /  he: -7694.625; th: -7546.875; in: -5025.625; , : -5002.5; an: -4981.125;
long jump sandwich: 30342  /  low: 4059; wil: 3372; bef: 2499; wel: 2142; y g: 1611;
twist: 470  /  -al: 120; ys?: 110; ks?: 60; la;: 60; ft?: 40;

Doesn't build anymore

error[E0503]: cannot use `state` because it was mutably borrowed
    --> /home/hasufell/.cargo/registry/src/github.com-1ecc6299db9ec823/getopts-0.2.14/src/lib.rs:1008:33
     |
955  |     let mut machine = |cont: &mut bool, (i, c): (usize, char)| {
     |                       ---------------------------------------- borrow of `state` occurs here
...
959  |         state = match (state, whitespace, limit) {
     |                        ----- borrow occurs due to use of `state` in closure
...
1008 |     while cont && match state { B | C => true, A => false } {
     |                                 ^ use of borrowed `state`
1009 |         machine(&mut cont, (fake_i, ' '));
     |         ------- borrow later used here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0503`.
error: could not compile `getopts`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

Removing Cargo.lock causes other errors:

error[E0599]: no method named `peek_next` found for struct `std::collections::linked_list::IterMut<'_, BestLayoutsEntry>` in the current scope
   --> src/simulator.rs:192:25
    |
192 |                 let opt_next = iter.peek_next();
    |                                     ^^^^^^^^^ method not found in `std::collections::linked_list::IterMut<'_, BestLayoutsEntry>`

error[E0599]: no method named `insert_next` found for struct `std::collections::linked_list::IterMut<'_, BestLayoutsEntry>` in the current scope
   --> src/simulator.rs:207:8
    |
207 |         iter.insert_next(entry);
    |              ^^^^^^^^^^^ method not found in `std::collections::linked_list::IterMut<'_, BestLayoutsEntry>`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: could not compile `keygen`

To learn more, run the command again with --verbose.

toolchain:

$ rustup show                                                                                                                    2280ms  Sat 19:33
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/hasufell/.rustup

installed toolchains
--------------------

stable-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu (default)
1.40.0-x86_64-unknown-linux-gnu

active toolchain
----------------

nightly-x86_64-unknown-linux-gnu (default)
rustc 1.52.0-nightly (9b471a3f5 2021-02-19)

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