From Modern Compiler Implementation in ML, let function g(x: int) : - PDF document

� ✎ ✑ ✣ ✣ ❆ ✣ ✏ ✌ ✡ ✟ ☛ ✡ ☎ ❞ ✝ ✆ ☎ � 1998 Andrew W. Appel From Modern Compiler Implementation in ML, let function g(x: int) : int = f(f(x)) var addTwentyFour := twice(twice(add(6))) let function h(m: int) : int = n+m var addTen : intfun := twice(addFive) function twice(f: intfun) : intfun = ☞✍✌ var seventeen := twice(add(5))(7) Cambridge University Press, c function add(n: int) : intfun = var addSeven : intfun := add(7) var addFive : intfun := add(5) var twentyTwo := addSeven(15) PROGRAM 15.1. A Fun-Tiger program. var twenty := addFive(15) in addTwentyFour(seventeen) type intfun = int -> int ✞✠✟ ✁✄✂ in h in g end end let end ✒✔✓✖✕✘✗✚✙✜✛✢✕ ✤✦✥✚✧✄★✩✥✫✪✭✬✫★✩✪✯✮✱✰✳✲✵✴✷✶✹✸✻✺✭✬✼✶✽✥✫✮✱✰✾✶✿✮❁❀✚❂❃✬✫✥✻❄✔✶✿✴❅✺✭✥✫✰❇❆❈✰❉✬✫❄❊✸❋★✩✰✢●■❍❑❏▲✶✹✸✻✮◆▼✿✬✻✥▲❖P✶✿✴❅◗❘✮ ▼✿✮✱❙✻▼❉✮❁✰❉✮❁✥❚✶❊★❯✶✿✴❅✺✭✥❱✺✭❂✘★❘❂❃✬✫✥✻❄✔✶✿✴❅✺✭✥❳❲✩★✩✧❅✬✫✮❨❄❩★✩✥❱❬❭✮❪✶✹✸✻✮❫★✭❀✻❀✼▼✿✮❁✰❉✰■✺✭❂❴✶✿✸✻✮ ◗❵★✩❄❊✸✫✴❅✥✻✮❫❄❁✺❛❀✻✮❨❂❜✺✩▼■✶✿✸❝★❯✶✽❂❃✬✫✥✻❄✔✶✿✴❅✺✯✥❡❞ ❢❣✸✻✮❁✥✐❤❦❥❊❧❑♠♥❥✿♦✢♣❊qr❤❭s❁♠❈tP✉✈❤✻❧✇❄❁✺✭◗①✮❫✴②✥③✶✿✺④✶✹✸✻✮❨❙✫✴❅❄❑✶✹✬✼▼✿✮✭❏✻❂❜✬✫✥✻❄✔✶✿✴❅✺✭✥✫✰■★✩▼❉✮ ▼✿✮✱❙✻▼❉✮❁✰❉✮❁✥❚✶✹✮✱❀✚★✭✰ s✱⑤❅✉⑥❧❊qr⑦✹❥⑧❧ ⑨✜▼✿✮✱❄❁✺✩▼✿❀✻✰✳✶✿✸✫★✈✶✽❄❁✺✭✥❚✶❊★✩✴❅✥⑩✶✹✸✻✮ ◗❵★✩❄❊✸✫✴❅✥✻✮❑❖♥❄❁✺❛❀✻✮ ❙❭✺✭✴❅✥❚✶✹✮✔▼ ★✩✥✫❀❱★✖✲✳★❁❶❷✶✹✺①★✩❄❁❄✱✮❁✰❉✰❸✶✹✸✻✮❫✥✻✮❁❄❁✮✱✰✿✰✿★✈▼✾❶❷✥✫✺✭✥r❖♥✧❅✺r❄❁★✭✧❭❲✩★✩▼❉✴✄★✩❬✫✧②✮❁✰ ❥⑧❤✫❹❺t❜⑦❉✉✈❤❝❻❼❥❑❤❽♠ ❍⑧❞ ❾❿✥✫✮❪✲❸★❁❶❳✺✯❂❴▼✿✮❁❙✼▼❉✮❁✰❉✮❁✥❚✶✹✴❅✥✻✪❘✮✱✥③❲▲✴②▼❉✺✯✥✻◗❘✮❁✥❚✶✹✰✵✴❅✰✵✬✫✰❉✴❅✥✻✪④✶✹✸✻✮ ❧❑♠♥➀✩♠❈tPs✖⑤➁t❜❤✻➂ ➃❘➄❅➅⑧➆③➇➉➈❚➆r➊r➋❑➆❚➌▲➍✈➅❺➎❴➏➑➐✜➐➓➒❩➔⑥→❊➣↔➒❨↕✾➙❚➒❺➏✷➛➝➜❺➞❭➟r➜⑥➏②➛⑥➐✦→❊➠↔➡✯→❊➠➢→❊➞✍→✹➠✦→❊➛❚↕✹→⑧➣✜➐➓➜❨➒❺↕❊↕✹→❊➣➓➣➤➐➓➙✯→ ➜⑥➥✭➐➓→✹➠➓➦◆➜⑥➣♥➐✜➧❁➒❺➠✦➏✷➒❩➨③➩➑→⑧➣➫➒⑥➛✯➡➝➐➓➙✯→✵➭⑥➒❩➠➢➨③➒❩➭⑥→✳↕✹➜⑥➩✷➩✷→❊↕✿➐➓➜❺➠➤➨r→⑧↕✹➜⑥➦◆→⑧➣➫➩➑→⑧➣✦➣✜→✹➯✼→⑧↕✿➐➓➏➲➧⑥→❺➳