ÿØÿà JFIF    ÿÛ „  ( %"1!%)+...383,7(-.+  -+++--++++---+-+-----+---------------+---+-++7-----ÿÀ  ß â" ÿÄ     ÿÄ H    !1AQaq"‘¡2B±ÁÑð#R“Ò Tbr‚²á3csƒ’ÂñDS¢³$CÿÄ   ÿÄ %  !1AQa"23‘ÿÚ   ? ôÿ ¨pŸªáÿ —åYõõ\?àÒü©ŠÄï¨pŸªáÿ —åYõõ\?àÓü©ŠÄá 0Ÿªáÿ Ÿå[úƒ ú®ði~TÁbqÐ8OÕpÿ ƒOò¤Oè`–RÂáœá™êi€ßÉ< FtŸI“öÌ8úDf´°å}“¾œ6  öFá°y¥jñÇh†ˆ¢ã/ÃÐ:ªcÈ "Y¡ðÑl>ÿ ”ÏËte:qž\oäŠe÷󲍷˜HT4&ÿ ÓÐü6ö®¿øþßèô Ÿ•7Ñi’•j|“ñì>b…þS?*Óôÿ ÓÐü*h¥£ír¶ü UãSç‚Ÿ[AÐaè[ûª•õ&õj?†Éö+EzP—WeÒírJFt ‘BŒ†Ï‡%#tE Øz ¥OÛ«!1›üä±Í™%ºÍãö]°î(–:@<‹ŒÊö×òÆt¦ãº+‡¦%ÌÁ²h´OƒJŒtMÜ>ÀÜÊw3Y´•牋4ǍýʏTì>œú=Íwhyë,¾Ôò×õ¿ßÊa»«þˆѪQ|%6ž™A õ%:øj<>É—ÿ Å_ˆCbõ¥š±ý¯Ýƒï…¶|RëócÍf溪“t.СøTÿ *Ä¿-{†çàczůŽ_–^XþŒ±miB[X±d 1,é”zEù»& î9gœf™9Ð'.;—™i}!ôšåîqêÛ٤ёý£½ÆA–àôe"A$˝Úsäÿ ÷Û #°xŸëí(l »ý3—¥5m! rt`†0~'j2(]S¦¦kv,ÚÇ l¦øJA£Šƒ J3E8ÙiŽ:cÉžúeZ°€¯\®kÖ(79«Ž:¯X”¾³Š&¡* ….‰Ž(ÜíŸ2¥ª‡×Hi²TF¤ò[¨íÈRëÉ䢍mgÑ.Ÿ<öäS0í„ǹÁU´f#Vß;Õ–…P@3ío<ä-±»Ž.L|kªÀê›fÂ6@»eu‚|ÓaÞÆŸ…¨ááå>åŠ?cKü6ùTÍÆ”†sĤÚ;H2RÚ†õ\Ö·Ÿn'¾ ñ#ºI¤Å´%çÁ­‚â7›‹qT3Iï¨ÖÚ5I7Ë!ÅOóŸ¶øÝñØôת¦$Tcö‘[«Ö³šÒ';Aþ ¸èíg A2Z"i¸vdÄ÷.iõ®§)¿]¤À†–‡É&ä{V¶iŽ”.Ó×Õÿ û?h¬Mt–íª[ÿ Ñÿ ÌV(í}=ibÔ¡›¥¢±b Lô¥‡piη_Z<‡z§èŒ)iÖwiÇ 2hÙ3·=’d÷8éŽ1¦¸c¤µ€7›7Ø ð\á)} ¹fËí›pAÃL%âc2 í§æQz¿;T8sæ°qø)QFMð‰XŒÂ±N¢aF¨…8¯!U  Z©RÊ ÖPVÄÀÍin™Ì-GˆªÅËŠ›•zË}º±ŽÍFò¹}Uw×#ä5B¤{î}Ð<ÙD é©¤&‡ïDbàÁôMÁ." ¤‡ú*õ'VŽ|¼´Úgllº¼klz[Æüï÷Aób‡Eÿ dÑ»Xx9ÃÜ£ÁT/`¼¸vI±Ýµ·Ë‚“G³þ*Ÿû´r|*}<¨îºœ @¦mÄ’M¹”.œ«Y–|6ÏU¤jç¥ÕÞqO ˜kDÆÁ¨5ÿ š;Њ¦¦€GÙk \ –Þ=â¼=SͧµªS°ÚÍpÜãQűÀõ¬?ÃÁ1Ñ•õZà?hóœ€ L¦l{Y*K˜Ù›zc˜–ˆâ ø+¾ ­-Ök¥%ùEÜA'}ˆ><ÊIè“bpÍ/qÞâvoX€w,\úªò6Z[XdÒæ­@Ö—€$òJí#é>'°Ú ôª˜<)4ryÙ£|óAÅn5žêŸyÒäMÝ2{"}‰–¤l÷ûWX\l¾Á¸góÉOÔ /óñB¤f¸çñ[.P˜ZsÊË*ßT܈§QN¢’¡¨§V¼(Üù*eÕ“”5T¨‹Âê¥FŒã½Dü[8'Ò¥a…Ú¶k7a *•›¼'Ò·\8¨ª\@\õ¢¦íq+DÙrmÎ…_ªæ»ŠÓœ¡¯’Ré9MÅ×D™lælffc+ŒÑ,ý™ÿ ¯þǤ=Å’Á7µ÷ÚÛ/“Ü€ñýã¼àí¾ÕÑ+ƒ,uµMâÀÄbm:ÒÎPæ{˜Gz[ƒ¯«® KHà`ßØŠéí¯P8Aq.C‰ à€kòpj´kN¶qô€…Õ,ÜNŠª-­{Zö’æû44‰sŽè‰îVíRœÕm" 6?³D9¡ÇTíÅꋇ`4«¸ÝÁô ï’ýorqКÇZ«x4Žâéþuïf¹µö[P ,Q£éaX±`PÉÍZ ¸äYúg üAx ’6Lê‚xÝÓ*äQ  Ï’¨hÍ =²,6ï#rÃ<¯–£»ƒ‹,–ê•€ aÛsñ'%Æ"®ÛüìBᝠHÚ3ß°©$“XnœÖ’î2ËTeûìxîß ¦å¿çÉ ðK§þ{‘t‚Ϋ¬jéîZ[ ”š7L¥4VÚCE×]m¤Øy”ä4-dz£œ§¸x.*ãÊÊ b÷•h:©‡¦s`BTÁRû¾g⻩‹jø sF¢àJøFl‘È•Xᓁà~*j¯ +(ÚÕ6-£¯÷GŠØy‚<Ç’.F‹Hœw(+)ÜÜâÈzÄäT§FߘãÏ;DmVœ3Àu@mÚüXÝü•3B¨òÌÁÛ<·ÃÜ z,Ì@õÅ·d2]ü8s÷IôÞ¯^Ç9¢u„~ëAŸï4«M? K]­ÅàPl@s_ p:°¬ZR”´›JC[CS.h‹ƒïËœ«Æ]–÷ó‚wR×k7X‰k›‘´ù¦=¡«‰¨¨Â')—71ó’c‡Ðúµ `é.{§p¹ój\Ž{1h{o±Ý=áUÊïGÖŒõ–-BÄm+AZX¶¡ ïHðæ¥JmÙ;…ä¡Ÿˆ¦ ° äšiÉg«$üMk5¤L“’çÊvïâï ,=f“"íἊ5ô¬x6{ɏžID0e¸vçmi'︧ºð9$ò¹÷*£’9ÿ ²TÔ…×>JV¥}Œ}$p[bÔ®*[jzS*8 ”·T›Í–ñUîƒwo$áè=LT™ç—~ô·¤ÈÚ$榍q‰„+´kFm)ž‹©i–ËqÞŠ‰à¶ü( ‚•§ •°ò·‡#5ª•µÊ﯅¡X¨šÁ*F#TXJÊ ušJVÍ&=iÄs1‚3•'fý§5Ñ<=[íÞ­ PÚ;ѱÌ_~Ä££8rÞ ²w;’hDT°>ÈG¬8Á²ÚzŽ®ò®qZcqJêäÞ-ö[ܘbň±çb“Š¶31²n×iƒðÕ;1¶þÉ ªX‰,ßqÏ$>•î íZ¥Z 1{ç൵+ƒÕµ¥°T$§K]á»Ûï*·¤tMI’ÂZbŽÕiÒ˜}bÓ0£ª5›¨ [5Ž^ÝœWøÂÝh° ¢OWun£¤5 a2Z.G2³YL]jåtì”ä ÁÓ‘%"©<ÔúÊ°sº UZvä‡ÄiÆÒM .÷V·™ø#kèýiíÌ–ª)µT[)BˆõÑ xB¾B€ÖT¨.¥~ð@VĶr#¸ü*åZNDŽH;âi ],©£öØpù(šºãö¼T.uCê•4@ÿ GÕÛ)Cx›®0ø#:ÏðFÒbR\(€€Ä®fã4Þ‰Fä¯HXƒÅ,†öEÑÔÜ]Öv²?tLÃvBY£ú6Êu5ÅAQ³1‘’¬x–HŒÐ‡ ^ ¸KwJôÖŽ5×CÚ¨vÜ«/B0$×k°=ðbÇ(Ï)w±A†Á† 11Í=èQšµ626ŒÜ/`G«µ<}—-Ö7KEHÈÉðóȤmݱû±·ø«Snmá=“ä«šmݱŸ¡¶~ó·“äUóJæúòB|E LêŽy´jDÔ$G¢þÐñ7óR8ýÒ…Ç› WVe#·Ÿ p·Fx~•ݤF÷0Èÿ K¯æS<6’¡WШ; ´ÿ ¥Êø\Òuî†åÝ–VNœkÒ7oòX¨Á­Ø÷FÎÑä±g÷ÿ M~Çî=p,X´ ÝÌÚÅ‹’ÃjÖ.ØöÏñ qïQ¤ÓZE†° =6·]܈ s¸>v•Ž^Ý\wq9r‰Î\¸¡kURÒ$­*‹Nq?Þª*!sŠÆ:TU_u±T+øX¡ ®¹¡,ÄâÃBTsÜ$Ø›4m椴zÜK]’’›Pƒ @€#â˜`é¹=I‡fiV•Ôî“nRm+µFPOhÍ0B£ €+¬5c v•:P'ÒyÎ ‰V~‚Ó†ÖuókDoh$å\*ö%Ю=£«…aȼ½÷Û.-½VŒŠ¼'lyî±1¬3ó#ÞE¿ÔS¤gV£m›=§\û"—WU¤ÚǼÿ ÂnÁGŒÃ ‚õN D³õNÚíŒÕ;HôyÄÈ©P¹Ä{:?R‘Ô¨âF÷ø£bÅó® JS|‚R÷ivýáâ€Æé¡è³´IئÑT!§˜•Øª‚¬â@q€wnïCWÄ@JU€ê¯m6]Ï:£âx'+ÒðXvÓ¦Úm=–´7œ $ì“B£~p%ÕŸUþ« N@¼üï~w˜ñø5®—'Ôe»¤5ã//€ž~‰Tþ›Å7•#¤× Íö pÄ$ùeåì*«ÓŠEØWEÈsßg ¦ûvžSsLpºÊW–âµEWöˬH; ™!CYõZ ÃÄf æ#1W. \uWâ\,\Çf j’<qTbên›Î[vxx£ë 'ö¨1›˜ÀM¼Pÿ H)ƒêêŒA7s,|F“ 꺸k³9Ìö*ç®;Ö!Ö$Eiž•¹ÒÚ†ýóéÝû¾ÕS®ó$’NÝäŸz¤5r¦ãÄÃD÷Üø!°ø‡Ô&@m™Ì^Ãä­d q5Lnÿ N;.6½·N|#ä"1Nƒx“ã<3('&ñßt  ~ªu”1Tb㫨9ê–›–bìd$ߣ=#ÕãÒmU¯eí$EFù5ýYô櫨æ왍Ǘ±ssM]·á¿0ÕåJRÓªîiƒ+O58ÖñªŠÒx" \µâá¨i’¤i —Ö ” M+M¤ë9‚‰A¦°Qõ¾ßøK~¼Ã‘g…Ö´~÷Ï[3GUœÒ½#…kàÔ®Ò”‰³·dWV‰IP‰Ú8u¹”E ÖqLj¾êÕCBš{A^Âß;–¨`¯¬ìö ˼ ×tìø.tƐm*n¨y4o&Àx¥n¦×î‡aupáÛj8¿m›è¶ã!o½;ß0y^ý×^EÑ¿ÒjzŒ­)vÚÑnÄL …^ªô× ‡—‚3k Îý­hï]içå–îÏ*÷ñþ»Ô CÒjøjÍznˆ´ ¹#b'Fô‹ ‰v¥'’à'T´ƒHýÍ%M‰ ƒ&ÆÇŒï1 ‘ –Þ ‰i¬s žR-Ÿ kŠ¬á¬7:þ 0ŒÅÒÕ/aÙ¬ÃÝ#Úøœ ©aiVc‰. ¹¦ãµ” ›Yg¦›ÆÎýº°f³7ƒhá·¸­}&D9¡ÂsÉÙÞèŠõØàC™¨ñbFC|´Ü(ŸƒÚÒ-%»'a Ì¿)ËÇn¿úÿ ÞŽX…4ÊÅH^ôΑí@ù¹Eh¶“L8Çjù ¼ÎåVªóR©Ï5uà V4lZß®=€xÖŸ–ÑÈ ÷”¨°¾__yM1tÉ?uÆþIkÄgæ@þ[¢†°XÃJ£j·:nkÅ¢u ‘}âGzö­/IµèŠ¬¼48q¦F°ŽR¼=ûì{´¯RýicS ÕÛ íNtÍÙï£,w4rêì®»~x(©Uñ§#Ñ&œÕ¤>ÎåÍÓ9’Ö{9eV­[Öjâ²ãu]˜å2›qÑšÕJç0€sÄ|Êëè0튔bÁ>“{×_F`Ø©ºê:µä,v¤ðfc1±"«ÔÍän1#=· Âøv~H½ÐßA¾¿Ü€Óš]Õ; I¾÷ç‚Qi†î¹9ywÔKG˜áñ zQY—§ÃÕZ07§X‚ Áh;ÁM)iÌCH-¯T‘ë|A0{Ò½LÚ–TâÖkÜ’dÀ“rmm»”جPF³ÖcbE§T€ÒxKºû’Ó®7±²(\4ŽÃ¸Uu@j™yĵ;³µ!Á¢b.W¤=mõ´êµK k ¸K^ÜÛ#p*Ü14qkZç5ïë †°5Ï%ÍÛ<Õ¤×Ô¥ê†C Õ´¼ú$ƒÖ“”]Ù¬qÞÚ[4©ý!ûÏ—Áb쳐XµA¬â~`›Çr¸8ìùÝ䫦<>ä÷«?xs´ÇÑ /á;¹øüÊÈÙà{"@Žïzâ¬[âß‚ U_<ÇŸ½4èN˜ú61®qŠu ¦þF£»äJ_ˆÙÎ~ ÞAã–Ý„Ï—rŠD;xTž‘ô`É«…suãO`?³à™ô Lý#Íc5öoæØ‚y´´÷«ZR§<&JÇ+éâô´€i!Àˆ0æAoàðLèÖ-2ŸõW.’t^–(KÁmHµV@xÜÇy®Ñø­â^:Ú3w· 7½¹°ñ¸â¹®:',«Mœ—n­Á+Ãbš LÈ‘ÄnRÓÅœ%¦²‰¨ùQ:¤f‚ "PÕtô¸…cæl…&˜Ú˜Ôkv‹ž+vŠ,=¢v­6—Xy*¥t£«<™:“aîϲ=¦6rO]XI¿Œ÷¤zÚ­›¶ 6÷”w\d ü~v®ˆÌk«^m<ÿ ¢‰Õ\)ùºŽ;… lîÙÅEŠ®cѾ@vnMÏ,¼“ñ•ŽBxðÃzãÇç%3ˆ"}Ù•Åî> BÉú;Ò]V+P˜F_´ßé> Øše|ï‡ÄOmFæÇ ãqÞ$/xÐx­z`ï9"œÜij‚!7.\Td…9M‡•iŽ‹¾‘50ÞŽn¥ß4ÉôO ¹*í^QêËÜÇÌ8=Ž§s‰'ÂëÙ«á%Pú[O †ÅP¯VsŽ°.‰,kc¶ ¬A9n˜XÎ-ÞšN["¹QÕ‰ƒMýÁߺXJæÍaLj¾×Ãmã¾ãÚ uñÒþåQô¦¥ /ÄUx:‚ÍÜ’ Đ©ØÝ3V¨‰ÕnÐ6ó*óúK­«…c ¯U òhsý­jóÔj#,ímŒRµ«lbïUTŒÑ8†Ä0œÏr`ð¡¬É Ї ë"À² ™ 6¥ f¶ ¢ÚoܱԷ-<Àî)†a¶ž'Ú»¨TXqØæ¶÷YÄHy˜9ÈIW­YÀuMFë ºÏ’AqÌ4·/Ú †ô'i$øä­=Ä Ý|öK×40è|È6p‘0§)o¥ctî§H+CA-“ xØ|ÐXŠç l8íºð3Ø:³¤¬KX¯UÿÙ // run // Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package main // Concrete types implementing M method. // Smaller than a word, word-sized, larger than a word. // Value and pointer receivers. type Tinter interface { M(int, byte) (byte, int) } type Tsmallv byte func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x+int(v) } type Tsmallp byte func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x+int(*p) } type Twordv uintptr func (v Twordv) M(x int, b byte) (byte, int) { return b, x+int(v) } type Twordp uintptr func (p *Twordp) M(x int, b byte) (byte, int) { return b, x+int(*p) } type Tbigv [2]uintptr func (v Tbigv) M(x int, b byte) (byte, int) { return b, x+int(v[0])+int(v[1]) } type Tbigp [2]uintptr func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x+int(p[0])+int(p[1]) } // Again, with an unexported method. type tsmallv byte func (v tsmallv) m(x int, b byte) (byte, int) { return b, x+int(v) } type tsmallp byte func (p *tsmallp) m(x int, b byte) (byte, int) { return b, x+int(*p) } type twordv uintptr func (v twordv) m(x int, b byte) (byte, int) { return b, x+int(v) } type twordp uintptr func (p *twordp) m(x int, b byte) (byte, int) { return b, x+int(*p) } type tbigv [2]uintptr func (v tbigv) m(x int, b byte) (byte, int) { return b, x+int(v[0])+int(v[1]) } type tbigp [2]uintptr func (p *tbigp) m(x int, b byte) (byte, int) { return b, x+int(p[0])+int(p[1]) } type tinter interface { m(int, byte) (byte, int) } // Embedding via pointer. type T1 struct { T2 } type T2 struct { *T3 } type T3 struct { *T4 } type T4 struct { } func (t4 T4) M(x int, b byte) (byte, int) { return b, x+40 } var failed = false func CheckI(name string, i Tinter, inc int) { b, x := i.M(1000, 99) if b != 99 || x != 1000+inc { failed = true print(name, ".M(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") } CheckF("(i="+name+")", i.M, inc) } func CheckF(name string, f func(int, byte) (byte, int), inc int) { b, x := f(1000, 99) if b != 99 || x != 1000+inc { failed = true print(name, "(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") } } func checkI(name string, i tinter, inc int) { b, x := i.m(1000, 99) if b != 99 || x != 1000+inc { failed = true print(name, ".m(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") } checkF("(i="+name+")", i.m, inc) } func checkF(name string, f func(int, byte) (byte, int), inc int) { b, x := f(1000, 99) if b != 99 || x != 1000+inc { failed = true print(name, "(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") } } func shouldPanic(f func()) { defer func() { if recover() == nil { panic("not panicking") } }() f() } func shouldNotPanic(f func()) { f() } func main() { sv := Tsmallv(1) CheckI("sv", sv, 1) CheckF("sv.M", sv.M, 1) CheckF("(&sv).M", (&sv).M, 1) psv := &sv CheckI("psv", psv, 1) CheckF("psv.M", psv.M, 1) CheckF("(*psv).M", (*psv).M, 1) sp := Tsmallp(2) CheckI("&sp", &sp, 2) CheckF("sp.M", sp.M, 2) CheckF("(&sp).M", (&sp).M, 2) psp := &sp CheckI("psp", psp, 2) CheckF("psp.M", psp.M, 2) CheckF("(*psp).M", (*psp).M, 2) wv := Twordv(3) CheckI("wv", wv, 3) CheckF("wv.M", wv.M, 3) CheckF("(&wv).M", (&wv).M, 3) pwv := &wv CheckI("pwv", pwv, 3) CheckF("pwv.M", pwv.M, 3) CheckF("(*pwv).M", (*pwv).M, 3) wp := Twordp(4) CheckI("&wp", &wp, 4) CheckF("wp.M", wp.M, 4) CheckF("(&wp).M", (&wp).M, 4) pwp := &wp CheckI("pwp", pwp, 4) CheckF("pwp.M", pwp.M, 4) CheckF("(*pwp).M", (*pwp).M, 4) bv := Tbigv([2]uintptr{5, 6}) pbv := &bv CheckI("bv", bv, 11) CheckF("bv.M", bv.M, 11) CheckF("(&bv).M", (&bv).M, 11) CheckI("pbv", pbv, 11) CheckF("pbv.M", pbv.M, 11) CheckF("(*pbv).M", (*pbv).M, 11) bp := Tbigp([2]uintptr{7,8}) CheckI("&bp", &bp, 15) CheckF("bp.M", bp.M, 15) CheckF("(&bp).M", (&bp).M, 15) pbp := &bp CheckI("pbp", pbp, 15) CheckF("pbp.M", pbp.M, 15) CheckF("(*pbp).M", (*pbp).M, 15) _sv := tsmallv(1) checkI("_sv", _sv, 1) checkF("_sv.m", _sv.m, 1) checkF("(&_sv).m", (&_sv).m, 1) _psv := &_sv checkI("_psv", _psv, 1) checkF("_psv.m", _psv.m, 1) checkF("(*_psv).m", (*_psv).m, 1) _sp := tsmallp(2) checkI("&_sp", &_sp, 2) checkF("_sp.m", _sp.m, 2) checkF("(&_sp).m", (&_sp).m, 2) _psp := &_sp checkI("_psp", _psp, 2) checkF("_psp.m", _psp.m, 2) checkF("(*_psp).m", (*_psp).m, 2) _wv := twordv(3) checkI("_wv", _wv, 3) checkF("_wv.m", _wv.m, 3) checkF("(&_wv).m", (&_wv).m, 3) _pwv := &_wv checkI("_pwv", _pwv, 3) checkF("_pwv.m", _pwv.m, 3) checkF("(*_pwv).m", (*_pwv).m, 3) _wp := twordp(4) checkI("&_wp", &_wp, 4) checkF("_wp.m", _wp.m, 4) checkF("(&_wp).m", (&_wp).m, 4) _pwp := &_wp checkI("_pwp", _pwp, 4) checkF("_pwp.m", _pwp.m, 4) checkF("(*_pwp).m", (*_pwp).m, 4) _bv := tbigv([2]uintptr{5, 6}) _pbv := &_bv checkI("_bv", _bv, 11) checkF("_bv.m", _bv.m, 11) checkF("(&_bv).m", (&_bv).m, 11) checkI("_pbv", _pbv, 11) checkF("_pbv.m", _pbv.m, 11) checkF("(*_pbv).m", (*_pbv).m, 11) _bp := tbigp([2]uintptr{7,8}) checkI("&_bp", &_bp, 15) checkF("_bp.m", _bp.m, 15) checkF("(&_bp).m", (&_bp).m, 15) _pbp := &_bp checkI("_pbp", _pbp, 15) checkF("_pbp.m", _pbp.m, 15) checkF("(*_pbp).m", (*_pbp).m, 15) t4 := T4{} t3 := T3{&t4} t2 := T2{&t3} t1 := T1{t2} CheckI("t4", t4, 40) CheckI("&t4", &t4, 40) CheckI("t3", t3, 40) CheckI("&t3", &t3, 40) CheckI("t2", t2, 40) CheckI("&t2", &t2, 40) CheckI("t1", t1, 40) CheckI("&t1", &t1, 40) // x.M panics if x is an interface type and is nil, // or if x.M expands to (*x).M where x is nil, // or if x.M expands to x.y.z.w.M where something // along the evaluation of x.y.z.w is nil. var f func(int, byte) (byte, int) shouldPanic(func() { psv = nil; f = psv.M }) shouldPanic(func() { pwv = nil; f = pwv.M }) shouldPanic(func() { pbv = nil; f = pbv.M }) shouldPanic(func() { var i Tinter; f = i.M }) shouldPanic(func() { _psv = nil; f = _psv.m }) shouldPanic(func() { _pwv = nil; f = _pwv.m }) shouldPanic(func() { _pbv = nil; f = _pbv.m }) shouldPanic(func() { var _i tinter; f = _i.m }) shouldPanic(func() { var t1 T1; f = t1.M }) shouldPanic(func() { var t2 T2; f = t2.M }) shouldPanic(func() { var t3 *T3; f = t3.M }) shouldPanic(func() { var t3 T3; f = t3.M }) if f != nil { panic("something set f") } // x.M does not panic if x is a nil pointer and // M is a method with a pointer receiver. shouldNotPanic(func() { psp = nil; f = psp.M }) shouldNotPanic(func() { pwp = nil; f = pwp.M }) shouldNotPanic(func() { pbp = nil; f = pbp.M }) shouldNotPanic(func() { _psp = nil; f = _psp.m }) shouldNotPanic(func() { _pwp = nil; f = _pwp.m }) shouldNotPanic(func() { _pbp = nil; f = _pbp.m }) shouldNotPanic(func() { var t4 T4; f = t4.M }) if f == nil { panic("nothing set f") } }