This is Scribe!
Manuel Serrano Erick Gallesio Inria Sophia-Antipolis Universite´ de Nice - Sophia Antipolis 2004 route des Lucioles - BP 93 930 route des Colles, BP 145 F-06902 Sophia Antipolis, Cedex F-06903 Sophia Antipolis, Cedex
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ABSTRACT 8N%PU5<8d7YA,8=$>B@79A%Tf79Aª<]\¢Q¨P"N%VW="A¨BcB@5%=X\%<B@=iQ¤Ln7bB@8dR<¤8 BMN%:S\,<¤B@=
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B@Qe="Vih#=m\]7YA,87Y\,=j 465,798;:3<:#=?>;:,>@="8=$AB@8DC#E%F#GIH%J#K¢ 8N%PU5<86B@5%=dAN%Vuh#=?>6QLk6Q¤>U\,8"K,:3<¤>U<¤T>U<¤:%5%8;Q¤>D8="P$B@79QA,8;7bBDP"QA¢Z TN3<¤T=MLOQ¤>[<¤N,B@5%Q¤>@79A%T]\,Q¨P$N%VW="A¨B@8"^)_ `="Aa7bL.7bBc7Y8d BU<79A,8"^iC3E3F#GIH,Ja798[5%79T5,Rbl8N%7bBU<h,R9=iLOQ¤>[B@5%=$8=iP"QVW:%N¢BU<¤B@79QA,8"^Mo :#Q8=fB@Q¨QRgK.79Bih#="8 Bi8N%7bB@8jB@5%=ek;>@7bB@79A%TlQLDB@="PU5%A,79Pm<Rn\,Q¨P"N,VW="A¨B@8 :,>@QT>U<¤V¬798]V]<\¢=}QLW@ g£gg}®OB@5%<¤Bf798"KX@¤%@ ¤,gW79A«B@5%= 8N,P?5X<¤8 k6="hj:3<¤T="8-Q¤> B@="PU5%A,7YP"<R¦>@=":#Q¤>B@8"K¦odp qr\,Q¨P$N%VW="A¨BU<¤B@79QA%8"K :,>@QT>U<¤VWVW7YA,Ta¯<>@TQA#°<¤A3\±`<¤>@79QN,8fLIN%A,P$B@79QA%8]B@53<B\¢¢A3<¤VW79Z =?B@P^)_.s¢="P"N¢B@79A%TeC#E%F#GIH%JW:¢>@QT>U<¤VW86Pm<¤Aa:,>@Q\¢N%P"=t\,Q¨P"N,VW="A¨B@8nQ¤L Pm<¤RYRblP$QVW:%N¢B@=]®OkD5%="A}B@5,=WC3E3F#GH%Ja:¢>@QT>U<¤V²>@N,A%8U°DA%=$k³B@=$sB@8"^ `<¤>@79QN%8iLIQ>@V]<B@8u8N%PU5v<8up Q8 B?wP$>@79:,BmK)p x[ynK-z[4D{}|.K.40=$s¢79A,LIQ 465%=$8=nLON,A%P$B@79QA,8-<¤>@=6\,=$¡%A%=m\M79AXB@5,=;wP?5,="VW=.:,>@QT¤>U<VWVW79A%TcRY<A¢Z Q¤>W~tA,7bsV]<Av:%<T=$8"^v4653<BW798"K)B@5,=`¦=?>8@<VW=f:,>@QT>U<¤VPm<A TN%<T=^.465%=6C3E3F#GIH,Jt8 ¢A¨BU<¤s[=$A3<h,R9="8 <;8 k6=$=$B 5%<¤>@VWQA¨th#=$B+kn="="A h#=tN%8=m\]B@Qe:,>@Q\¢N%P"=M\¢Q¨P"N%VW=$AB@8n7YAa\,7bS=$>@="A¨B;LIQ>@V]<¤B@8"^nC3E3F#GH%J B@5%=t8 BU<¤B@79PX<A3\\¢¢A3<¤VW79P[P"QVW:#QA%="A¨B@86Q¤L 798j<]LON%R9R.LO=m<B@N,>@=m\ :,>@QT>U<¤VWVW7YA,TRY<¤A%TN%<T=Wh%N,B[79B]9mm¤dR979¦=u< V]<>@N%:fR<¤A%TN3<T= zt4D{}| ^ odN¢B@5%Q¤>@7YA,T\¢Q¨P"N%VW="A¨B@8ukD7bB@5«<´:,>@QT>U<VWVW79A,TªRY<A,TN%<T= 798]QL P"QN,>@8=MA%Q¤Bc <:,:,>@Q<PU5K8N%PU5j<8rB@5%= 4 µ¤¦B¢:#="8=$BB@79A%T;8 ¢8 B@="V}^p Q8 B?wP$>@79:,B 1. INTRODUCTION _ b¶$)Pm<A<R98Q}h#=WP"RY<887b¡%=m\´79AªB@5,7Y8jPm<B@="TQ¤>¨^f_ `="Aª7bL;7bBX798jA%QB C3E3F#GH%Jl798j<]LIN%A,P$B@79QA3<¤R.:,>@QT¤>U<VWVW79A%TfRY<A,TN3<¤T=W\¢="879TA,=m\LIQ> T=$A%=$>U<¤RYRb´\,7b>@="P$B@RbN%8="\ LIQ>i<N¢B@5%Q>@79A,T,K79BM>@=$:,>@="8="A¨B@8j<\,Q¨P"N¢Z <¤N,B@5,Q>@79A%T \¢Q¨P"N%VW="A¨BU<B@7YQA%8"K-8N,P?5<8jk6="h:%<T=$8iQ¤>iB@="PU5%A,79Pm<R VW="A¨BM<¤8M<:¢>@QT¤>U<V©kD5,Q8=e=$s¢="P$N,B@79QA ¢7Y=$R\¢8M<]8=$BjQL):,>@79A¨B@=m\ >@=$:#Q>B@8"^DqBd798dh,N%79RbBtQA}B@Q:lQ¤L B@5,=Xw¢PU5%="VW=M:¢>@QT¤>U<VWVW79A%TeRY<¤A,Z :3<¤T="8"^ TN3<¤T=t m^0qB@8P"QA,P$>@=$B@=.8 ¢ABU<s[7980879VW:,RY= <¤A3\[7bB08QN%A%\,8LO<VW79R97Y<¤> B@Qd<A¨¨QA%=.N%8="\MB@QcV]<¤>@N,:[RY<A%TN3<¤T="8"^ ocN,B@5%Q¤>@79A%Tc · AuB@5,=cQ¤B@5%=$>)87Y\,=K¦8QR9N,B@79QA,8nh%<8=m\eQAeB@5%=cw%¸M{}| ¹%Q> {}| kD7bB@5C3E3F#GH%Ju798)<8n879VW:,RY=D<¤8)kD7bB@5Wz[4D{}|}Q¤>6|b?4 ^-qB)798 ="`¦="A _, º¤¢LOQ¤>@V]<¤B@8.:,>@Q:#Q8=D :#Q8879h%R9=[B@QuN,8=t7bB6kD7bB@5%QN,BDA%Q¤B@79P"79A%TiB@5%<¤B;7bBD798D \,Q¨P$N%VW="A¨BD<>@=M=$s¢:,>@="88=m\fQN¢B@87\¢=MQL-B@5,=M\,Q¨P"N,VW="A¨B;7bB@8="RbL+^)y%Q¤> RY<¤A%TN%<T=ah#="Pm<¤N%8=QLDB@5%=fP"QA,P"798="A%=$88eQLd7bB@8uQ>@79T7YA%<R;8 ¢A¨BU<¤sS · 79A%8 BU<¤A%P"=K#B@5,=jx {¬ ¹» <:,:,>@Q¦<¤P?5 =$sB@QRY8t B@5,=n>U<¤B@79Qe ¤¨,3798.8V]<R9R9=$>.B@53<AjkD7bB@5uB@5%=nQB@5%=?>)V]<>@N%: h#=$Bk6="="A´\,Q¨P"N,VW="A¨B@8[<¤A3\ª:¢>@QT¤>U<VW8"^u465%798X\,79P?5,QB@QVil798M:,>@=?Z 8 ¢8 B@="VW86kn=M53 B@53<B;7bBDV]<¦=$8n879VW:%R9=M\¢Q¨P"N%VW="A¨B@8)53<¤>U\¢=$>6B@QiP"Q\,=tB@5%<A]kD7bB@5a< _-s¢="P"N¢B@7YA,T]<C#E%F#GIH%J:,>@QT¤>U<V kD7bB@5 T=$A%=$>U<¤R)R979A%TN%798 B@79PuB@Q¨QR h#="Pm<¤N%8=e7bB[>@=m¢¨N,79>@=$8[B@5%=uN,8@<T=eQLn8="`¨Z \¢N%P"=$8 <;BU<¤>@T=?B.\,Q¨P"N,VW="A¨Bm^rqB P"<Ajh#=)zt4D{}|]¡%R9="8B@5%<¤B 8N,7bB k6="h =$>U<¤R.\,7bS=$>@="A¨BdR<¤A%TN3<T="8tkD7bB@5ª\,7bS=$>@="A¨Bd8="V]<A¨B@79P"8[<¤A3\l\¢79S=?>Z h¢>@QmkD8=$>@8"K#| 4 ¡3R9="86LIQ>D5,7YT5,Z¢¨N3<¤RY7bB]:,>@79A¨B@=m\]\,Q¨P"N,VW="A¨B@8"KQ> ="A¨BD8 ¢A¨BU<¤sS^ _¢ ¼½7bB@5uB@5,=D\,="`¦=$RYQ:%VW="A¨B.Q¤Lr\¢¢A3<¤VW7YPnP"QA¨B@="A¨B.k6="hW87bB@="8"K¨<[T>@=m<B ¦)N%79RY\,79A%Te:,N,>@="Rb]8 BU<B@7YP[B@=?s¢B@8"KB@5%<¤B;798;B@=$sB@8; AN%Vih#=$>lQLe7YA¨B@=$>@VW="\,7Y<¤B@=8QR9N,B@79QA,8ªh%<8=m\¾QA¾:¢>@QT>U<¤VWVW79A%T Q¤LWP"QVW:%N,BU<B@79QAK[7Y8 T="A%=$>U<¤R9R9§A,QB 8N,¨eP"79="A¨BlLOQ>="RY<¤h#Q>U<¤B@="\ RY<A,TN3<¤T="853 \¢Q¨P"N%VW=$AB@8"^ y¢>@=m¢¨N%="A¨B@Rb]QA,=[A%="="\,8;B@QW<N¢B@QV]<B@7YP"<R9Rba:¢>@Q\,N%P$= P"QA%8798 B]79A«T79`79A%T´<k;<"B@Qª="Vuh#=m\Pm<¤R9RY8WB@Q´<:¢>@QT>U<¤VWVW79A%T :%<¤>B@8[Q¤LnB@5,=XB@=$sBm^j465,798t>U<A,T="8[L>@QV©`=$>l879VW:%R9=uQ:#=$>U<¤B@79QA%8 RY<A,TN3<¤T=i7YA,87Y\,=X<]\,Q¨P"N,VW="A¨Bm^Dp ztp¾ À¤-798d:,>@Qh%<h,R9B@5%=jVWQ8 B >@=":¢>@="8="A¨BU<¤B@79`¦=DQL#B@5,798)79A3\S^-o±\¢Q¨P"N%VW="A¨B.798)<[VW79siQL#B@=?s¢B)<¤A3\ P"Q\¢=}=$s¢:,>@="88="\vkD7bB@5Á\,7bS=$>@="A¨BW8 ¢A¨BU<¤s¢="8"^Â465,7Y8W79VW:,RY79="8iB@53<¤B Permission to make digital or hard copies, to republish, to post on B@5%=}<N,B@5,Q>?Ã:,>@QT¤>U<VWVW=$>eVuN%8 BW\,=m<¤Rd<B]B@5%=a`=$>v8@<VW=aB@79VW= servers or to redistribute to lists all or part of this work is granted with- kD7bB@5B@5,=[N%A%\,=$>@Rb¢79A%TjB@=$sB;V]<¤>@N%:]8 ¢8 B@="VÄ<¤86k6="R9R<8;B@5%=d:,>@Q¤Z out fee provided that copies are not made or distributed for profit or T>U<¤VWVW79A%TcR<¤A%TN3<T=^ y%N¢>B@5%=$>@VWQ¤>@=KB@5%="8= B@Q¨QR98 \,QtA,QB-:#=?>@VW79B commercial advantage and that copies bear this notice and the full cita- B@Qa>@="7bL<}\¢Q¨P"N%VW=$AB[8 B>@N%P$B@N¢>@=W<A%\´<¤>@=WT="A%=?>U<R9Rb´R979VW7bB@=m\B@Q tion on the first page. To otherwise copy or redistribute requires prior B@5%=t:,>@Q\,N,P$B@79QA}Q¤L k6=$h}:3<¤T="8cQA,R9¨^ specific permission. Third Workshop on Scheme and Functional Pro- gramming. October 3, 2002, Pittsburgh, Pennsylvania, USA. Copyright 465%=i<:,:,>@Q<PU5 kn=u:¢>@Q:#Q8=X798[79A%8:,79>@="\ h¨B@5%=i|0o[{}|8 ¢8 B@="V 2002 Manuel Serrano, Erick Gallesio. b¶m¹;kD5%79PU5vN%8="8ew¢PU5%="VW=f<8u <¤8i79AC#E%F#GIH%J#K- (3!/4 &56 &5 "!+57#+('*)8-, ,/.10 2 2 2 ¢79="RY\,8079B@8¡3A3<¤R¦LOQ¤>@V}^-¦nQ¤B@5iRY<A,TN%<T=$8-:#=$>@VW7bB0B@5%= N%8=?> B@QcB¢:#=$Z 8=?Bj\,Q¨P"N,VW="A¨B@8dN,879A%T<A¤%£ %d8 ¢A¨BU<¤sS^[zdQmk6="`¦=?>mKr|0o[{}|798 ¡ R979VW7bB@=m\iB@QtB@5,=;:,>@Q\¢N%P$B@79QAuQL#zt4D{}| KkD5,=$>@=m<¤8"K<8 8@<7Y\uh#=$LIQ>@=K B@5,=n="`<R9N%<¤B@79QAiQL# kD5%79PU5}="`<R9N3<B@="8;B@Q, :,N,B;LIQ>@V]<¤B@8"^ qAew="P$B@79QAu¹6k6=n:¢>@="8="A¨B.<¤AiQ`¦=$>@`79=$kQ¤L%B@5,=DC3E3F#GIH,J[8 ¢8 B@="V³LIQ> <¤N,B@5,Q>@79A%TX879VW:%R9=d8 BU<B@79PM\,Q¨P"N,VW="A¨B@8"^0¼´=d85,Qk«B@53<¤B; 9"!$# :<;-0=)§0?> @ A B > : > C @ CD2 :¢>@QT¤>U<V RYQ¨Q8uR979¦=] TN3<¤T=^eo VWQ¤>@=uP"QVW:%R9=$s N%8@<¤T=eQ¤LnB@5,=uRY<A,TN3<¤T=W798M85%QmkDAª7YA w="P$B@79QAºK3kD5%=$>@=X8QVW=X879VW:%R9=MB@=$sBcT="A,=$>U<¤B@79QA,8M<¤>@=i\,QA%=K#<8 kn="R9R-<8d8QVW=MB@=$sBc79A%P"R9N%879QA%8[h,N%79RbBdh¨79AB>@Q8:#="P$B@79A%TWB@5,=i\¢Q¨P$Z 465%=tC3E3F#GH%Jih¢>U<PU¦=$B LOQ¤>@V P$QR9R9="P$B@8;<¤RYR¢B@5%=DPU53<¤>U<¤P$B@=$>@8)h#=$B+kn="="A N,VW="A¨BX79B@8=$R9L^w="P$B@79QA£¢ 85%QmkD8i`<>@7YQN%8iP"N%8 B@QVW7¥¤"<¤B@79QA,8iB@53<B B@5%=fh,>U<¤P?=$B@8i79A P"<A´BU<¤¦=W:%RY<P$=\¢N,>@79A%TfB@5%=W=$s¢="P$N,B@79QAªQLc< C3E3F#GH%Jª:¢>@QT¤>U<V}^ 79A%87Y\,=;h¢>U<PU¦=$B@8-<>@=;53<¤A3\,R9=m\Xh¨MB@5%=nPU53<>U<P$B@=?>@8 8="¢N,="A%P$=GF§H§I6J,^ y 79A%<R9Rb¨K3k6=MP"QVW:3<>@=X79A w="P$B@79QAl]C#E%F#GIH%J]kD7bB@5l`<>@7YQN%8;B@Q¨QR98 y%Q¤>d79A,8 BU<A%P$=K,B@5,=[B@=$sBm Q¤>c:,>@QT¤>U<VWVW79A%TiRY<A%TN3<¤T="8dN%8=m\]LOQ>d<¤N,B@5%Q¤>@79A%TW\¢Q¨P"N%VW="A¨B@8"^ T(R 3/O"T2U,/. 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