diff --git a/contrib/60.repl/repl.scm b/contrib/60.repl/repl.scm
index 5bbbacd2..9fd1ebcd 100644
--- a/contrib/60.repl/repl.scm
+++ b/contrib/60.repl/repl.scm
@@ -35,6 +35,7 @@
               (scheme time)
               (scheme eval)
               (scheme r5rs)
+              (picrin pretty-print)
               (picrin macro))
      '(picrin user)))
 
diff --git a/lib/ext/boot.c b/lib/ext/boot.c
index 2b052e60..2803bd59 100644
--- a/lib/ext/boot.c
+++ b/lib/ext/boot.c
@@ -3,422 +3,612 @@
 
 #if PIC_USE_EVAL
 static const char boot_compile_rom[][80] = {
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-"e#begin (core#define compile #undefined) (core#begin (core#define eval #undefine",
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-"core#lambda (.obj.2181) (core#if (.%identifier?.2150 .obj.2181) (vector-ref (rec",
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+"nt-binding.2157 .env.2194) .id.2193))) (core#begin (core#define .find-identifier",
+".2161 (core#lambda (.id.2195 .env.2196) ((core#lambda (.it.2197) (core#if .it.21",
+"97 .it.2197 ((core#lambda (.it.2198) (core#if .it.2198 .it.2198 #f)) ((core#lamb",
+"da (.parent.2199) (core#if .parent.2199 (.find-identifier.2161 .id.2195 .parent.",
+"2199) (core#if (symbol? .id.2195) (.add-identifier!.2162 .id.2195 .env.2196) (.f",
+"ind-identifier.2161 (.identifier-name.2152 .id.2195) (.identifier-environment.21",
+"51 .id.2195))))) (.environment-parent.2159 .env.2196))))) (.search-scope.2160 .i",
+"d.2195 .env.2196)))) (core#begin (core#define .add-identifier!.2162 ((core#lambd",
+"a (.uniq.2200) (core#lambda (.id.2201 .env.2202) ((core#lambda (.it.2203) (core#",
+"if .it.2203 .it.2203 ((core#lambda (.it.2204) (core#if .it.2204 .it.2204 #f)) (c",
+"ore#if (core#if (not (.environment-parent.2159 .env.2202)) (symbol? .id.2201) #f",
+") (string->symbol (string-append (.environment-prefix.2158 .env.2202) (symbol->s",
+"tring .id.2201))) ((core#lambda (.uid.2205) (core#begin (.set-identifier!.2163 .",
+"id.2201 .uid.2205 .env.2202) .uid.2205)) (.uniq.2200 .id.2201)))))) (.search-sco",
+"pe.2160 .id.2201 .env.2202)))) ((core#lambda (.n.2206) (core#lambda (.id.2207) (",
+"(core#lambda (.m.2208) (core#begin (core#set! .n.2206 (+ .n.2206 1)) (string->sy",
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+"e .loop.2209 (core#lambda (.id.2210) (core#if (symbol? .id.2210) .id.2210 (.loop",
+".2209 (.identifier-name.2152 .id.2210))))) (.loop.2209 .id.2207))))) \".\" (number",
+"->string .m.2208))))) .n.2206))) 0))) (core#begin (core#define .set-identifier!.",
+"2163 (core#lambda (.id.2211 .uid.2212 .env.2213) ((.environment-binding.2157 .en",
+"v.2213) .id.2211 .uid.2212))) (core#begin (core#define .make-environment.2164 (c",
+"ore#lambda (.prefix.2214) (.%make-environment.2155 #f (symbol->string .prefix.22",
+"14) (make-ephemeron-table)))) (core#begin (core#define .default-environment.2165",
+" ((core#lambda (.env.2215) (core#begin (for-each (core#lambda (.x.2216) (.set-id",
+"entifier!.2163 .x.2216 .x.2216 .env.2215)) (core#quote (core#define core#set! co",
+"re#quote core#lambda core#if core#begin core#define-macro))) .env.2215)) (.make-",
+"environment.2164 (string->symbol \"\")))) (core#begin (core#define .extend-environ",
+"ment.2166 (core#lambda (.parent.2217) (.%make-environment.2155 .parent.2217 #f (",
+"make-ephemeron-table)))) (core#begin (core#define .global-macro-table.2167 (make",
+"-dictionary)) (core#begin (core#define .find-macro.2168 (core#lambda (.uid.2218)",
+" (core#if (dictionary-has? .global-macro-table.2167 .uid.2218) (dictionary-ref .",
+"global-macro-table.2167 .uid.2218) #f))) (core#begin (core#define .add-macro!.21",
+"69 (core#lambda (.uid.2219 .expander.2220) (dictionary-set! .global-macro-table.",
+"2167 .uid.2219 .expander.2220))) (core#begin (core#define .shadow-macro!.2170 (c",
+"ore#lambda (.uid.2221) (core#if (dictionary-has? .global-macro-table.2167 .uid.2",
+"221) (dictionary-delete! .global-macro-table.2167 .uid.2221) #undefined))) (core",
+"#begin (core#define .macro-objects.2171 (core#lambda () .global-macro-table.2167",
+")) (core#begin (core#define .expand.2172 ((core#lambda (.task-queue.2222) (core#",
+"begin (core#define .queue.2223 (core#lambda (.task.2236) ((core#lambda (.tmp.223",
+"7) (core#begin (.task-queue.2222 (cons (cons .tmp.2237 .task.2236) (.task-queue.",
+"2222))) .tmp.2237)) (cons #f #f)))) (core#begin (core#define .run-all.2224 (core",
+"#lambda () (for-each (core#lambda (.x.2238) ((core#lambda (.task.2239 .skelton.2",
+"240) ((core#lambda (.x.2241) (core#begin (set-car! .skelton.2240 (car .x.2241)) ",
+"(set-cdr! .skelton.2240 (cdr .x.2241)))) (.task.2239))) (cdr .x.2238) (car .x.22",
+"38))) (reverse (.task-queue.2222))))) (core#begin (core#define .caddr.2225 (core",
+"#lambda (.x.2242) (car (cddr .x.2242)))) (core#begin (core#define .map*.2226 (co",
+"re#lambda (.proc.2243 .list*.2244) (core#if (null? .list*.2244) .list*.2244 (cor",
+"e#if (pair? .list*.2244) (cons (.proc.2243 (car .list*.2244)) (.map*.2226 .proc.",
+"2243 (cdr .list*.2244))) (.proc.2243 .list*.2244))))) (core#begin (core#define .",
+"literal?.2227 (core#lambda (.x.2245) (not ((core#lambda (.it.2246) (core#if .it.",
+"2246 .it.2246 ((core#lambda (.it.2247) (core#if .it.2247 .it.2247 #f)) (pair? .x",
+".2245)))) (.identifier?.2153 .x.2245))))) (core#begin (core#define .call?.2228 (",
+"core#lambda (.x.2248) (core#if (list? .x.2248) (core#if (not (null? .x.2248)) (.",
+"identifier?.2153 (car .x.2248)) #f) #f))) (core#begin (core#define .expand-varia",
+"ble.2229 (core#lambda (.var.2249 .env.2250) ((core#lambda (.x.2251) ((core#lambd",
+"a (.m.2252) (core#if .m.2252 (.expand-node.2234 (.m.2252 .var.2249 .env.2250) .e",
+"nv.2250) .x.2251)) (.find-macro.2168 .x.2251))) (.find-identifier.2161 .var.2249",
+" .env.2250)))) (core#begin (core#define .expand-quote.2230 (core#lambda (.obj.22",
+"53) (cons (core#quote core#quote) (cons .obj.2253 (core#quote ()))))) (core#begi",
+"n (core#define .expand-define.2231 (core#lambda (.var.2254 .form.2255 .env.2256)",
+" ((core#lambda (.uid.2257) (core#begin (.shadow-macro!.2170 .uid.2257) (cons (co",
+"re#quote core#define) (cons .uid.2257 (cons (.expand-node.2234 .form.2255 .env.2",
+"256) (core#quote ())))))) (.add-identifier!.2162 .var.2254 .env.2256)))) (core#b",
+"egin (core#define .expand-lambda.2232 (core#lambda (.args.2258 .body.2259 .env.2",
+"260) ((core#lambda (.env.2261) ((core#lambda (.args.2262) (with-dynamic-environm",
+"ent (list (cons .task-queue.2222 (core#quote ()))) (core#lambda () ((core#lambda",
+" (.body.2263) (core#begin (.run-all.2224) (cons (core#quote core#lambda) (cons .",
+"args.2262 (cons .body.2263 (core#quote ())))))) (.expand-node.2234 .body.2259 .e",
+"nv.2261))))) (.map*.2226 (core#lambda (.var.2264) (.add-identifier!.2162 .var.22",
+"64 .env.2261)) .args.2258))) (.extend-environment.2166 .env.2260)))) (core#begin",
+" (core#define .expand-define-macro.2233 (core#lambda (.var.2265 .transformer.226",
+"6 .env.2267) ((core#lambda (.uid.2268) ((core#lambda (.expander.2269) (core#begi",
+"n (.add-macro!.2169 .uid.2268 .expander.2269) #undefined)) (load (.expand.2235 .",
+"transformer.2266 .env.2267)))) (.add-identifier!.2162 .var.2265 .env.2267)))) (c",
+"ore#begin (core#define .expand-node.2234 (core#lambda (.expr.2270 .env.2271) (co",
+"re#if (.literal?.2227 .expr.2270) .expr.2270 (core#if (.identifier?.2153 .expr.2",
+"270) (.expand-variable.2229 .expr.2270 .env.2271) (core#if (.call?.2228 .expr.22",
+"70) ((core#lambda (.functor.2272) ((core#lambda (.key.2273) (core#if ((core#lamb",
+"da (.it.2274) (core#if .it.2274 .it.2274 #f)) (eqv? .key.2273 (core#quote core#q",
+"uote))) (.expand-quote.2230 (cadr .expr.2270)) (core#if ((core#lambda (.it.2275)",
+" (core#if .it.2275 .it.2275 #f)) (eqv? .key.2273 (core#quote core#define))) (.ex",
+"pand-define.2231 (cadr .expr.2270) (.caddr.2225 .expr.2270) .env.2271) (core#if ",
+"((core#lambda (.it.2276) (core#if .it.2276 .it.2276 #f)) (eqv? .key.2273 (core#q",
+"uote core#lambda))) (.queue.2223 (core#lambda () (.expand-lambda.2232 (cadr .exp",
+"r.2270) (.caddr.2225 .expr.2270) .env.2271))) (core#if ((core#lambda (.it.2277) ",
+"(core#if .it.2277 .it.2277 #f)) (eqv? .key.2273 (core#quote core#define-macro)))",
+" (.expand-define-macro.2233 (cadr .expr.2270) (.caddr.2225 .expr.2270) .env.2271",
+") (core#if #t ((core#lambda (.m.2278) (core#if .m.2278 (.expand-node.2234 (.m.22",
+"78 .expr.2270 .env.2271) .env.2271) (map (core#lambda (.x.2279) (.expand-node.22",
+"34 .x.2279 .env.2271)) .expr.2270))) (.find-macro.2168 .functor.2272)) #undefine",
+"d)))))) .functor.2272)) (.find-identifier.2161 (car .expr.2270) .env.2271)) (cor",
+"e#if (list? .expr.2270) (map (core#lambda (.x.2280) (.expand-node.2234 .x.2280 .",
+"env.2271)) .expr.2270) (error \"invalid expression\" .expr.2270))))))) (core#begin",
+" (core#define .expand.2235 (core#lambda (.expr.2281 .env.2282) ((core#lambda (.x",
+".2283) (core#begin (.run-all.2224) .x.2283)) (.expand-node.2234 .expr.2281 .env.",
+"2282)))) .expand.2235)))))))))))))) (make-parameter (core#quote ())))) (values .",
+"make-identifier.2149 .identifier?.2153 .identifier=?.2154 .identifier-name.2152 ",
+".identifier-environment.2151 .make-environment.2164 .default-environment.2165 .e",
+"nvironment?.2156 .find-identifier.2161 .add-identifier!.2162 .set-identifier!.21",
+"63 .macro-objects.2171 .expand.2172)))))))))))))))))))))) (core#lambda (.make-id",
+"entifier.2284 .identifier?.2285 .identifier=?.2286 .identifier-name.2287 .identi",
+"fier-environment.2288 .make-environment.2289 .default-environment.2290 .environm",
+"ent?.2291 .find-identifier.2292 .add-identifier!.2293 .set-identifier!.2294 .mac",
+"ro-objects.2295 .expand.2296) (core#begin (core#set! make-identifier .make-ident",
+"ifier.2284) (core#begin (core#set! identifier? .identifier?.2285) (core#begin (c",
+"ore#set! identifier=? .identifier=?.2286) (core#begin (core#set! identifier-name",
+" .identifier-name.2287) (core#begin (core#set! identifier-environment .identifie",
+"r-environment.2288) (core#begin (core#set! make-environment .make-environment.22",
+"89) (core#begin (core#set! default-environment .default-environment.2290) (core#",
+"begin (core#set! environment? .environment?.2291) (core#begin (core#set! find-id",
+"entifier .find-identifier.2292) (core#begin (core#set! add-identifier! .add-iden",
+"tifier!.2293) (core#begin (core#set! set-identifier! .set-identifier!.2294) (cor",
+"e#begin (core#set! macro-objects .macro-objects.2295) (core#set! expand .expand.",
+"2296)))))))))))))))))))))))))))) (core#begin ((core#lambda () (core#begin (core#",
+"define .define-transformer.2297 (core#lambda (.name.2299 .transformer.2300) (dic",
+"tionary-set! (macro-objects) .name.2299 .transformer.2300))) (core#begin (core#d",
+"efine .the.2298 (core#lambda (.var.2301) (make-identifier .var.2301 default-envi",
+"ronment))) ((core#lambda (.the-core-define.2302 .the-core-lambda.2303 .the-core-",
+"begin.2304 .the-core-quote.2305 .the-core-set!.2306 .the-core-if.2307 .the-core-",
+"define-macro.2308 .the-define.2309 .the-lambda.2310 .the-begin.2311 .the-quote.2",
+"312 .the-set!.2313 .the-if.2314 .the-define-macro.2315) (core#begin (.define-tra",
+"nsformer.2297 (core#quote quote) (core#lambda (.form.2320 .env.2321) (core#if (=",
+" (length .form.2320) 2) (cons .the-core-quote.2305 (cons (cadr .form.2320) (core",
+"#quote ()))) (error \"malformed quote\" .form.2320)))) (core#begin (.define-transf",
+"ormer.2297 (core#quote if) (core#lambda (.form.2322 .env.2323) ((core#lambda (.l",
+"en.2324) (core#if (= .len.2324 3) (append .form.2322 (cons (core#quote #undefine",
+"d) (core#quote ()))) (core#if (= .len.2324 4) (cons .the-core-if.2307 (cdr .form",
+".2322)) (error \"malformed if\" .form.2322)))) (length .form.2322)))) (core#begin ",
+"(.define-transformer.2297 (core#quote begin) (core#lambda (.form.2325 .env.2326)",
+" ((core#lambda (.len.2327) (core#if (= .len.2327 1) #undefined (core#if (= .len.",
+"2327 2) (cadr .form.2325) (core#if (= .len.2327 3) (cons .the-core-begin.2304 (c",
+"dr .form.2325)) (cons .the-core-begin.2304 (cons (cadr .form.2325) (cons (cons .",
+"the-begin.2311 (cddr .form.2325)) (core#quote ())))))))) (length .form.2325)))) ",
+"(core#begin (.define-transformer.2297 (core#quote set!) (core#lambda (.form.2328",
+" .env.2329) (core#if (core#if (= (length .form.2328) 3) (identifier? (cadr .form",
+".2328)) #f) (cons .the-core-set!.2306 (cdr .form.2328)) (error \"malformed set!\" ",
+".form.2328)))) (core#begin (core#define .check-formal.2316 (core#lambda (.formal",
+".2330) ((core#lambda (.it.2331) (core#if .it.2331 .it.2331 ((core#lambda (.it.23",
+"32) (core#if .it.2332 .it.2332 ((core#lambda (.it.2333) (core#if .it.2333 .it.23",
+"33 #f)) (core#if (pair? .formal.2330) (core#if (identifier? (car .formal.2330)) ",
+"(.check-formal.2316 (cdr .formal.2330)) #f) #f)))) (identifier? .formal.2330))))",
+" (null? .formal.2330)))) (core#begin (.define-transformer.2297 (core#quote lambd",
+"a) (core#lambda (.form.2334 .env.2335) (core#if (= (length .form.2334) 1) (error",
+" \"malformed lambda\" .form.2334) (core#if (.check-formal.2316 (cadr .form.2334)) ",
+"(cons .the-core-lambda.2303 (cons (cadr .form.2334) (cons (cons .the-begin.2311 ",
+"(cddr .form.2334)) (core#quote ())))) (error \"malformed lambda\" .form.2334))))) ",
+"(core#begin (.define-transformer.2297 (core#quote define) (core#lambda (.form.23",
+"36 .env.2337) ((core#lambda (.len.2338) (core#if (= .len.2338 1) (error \"malform",
+"ed define\" .form.2336) ((core#lambda (.formal.2339) (core#if (identifier? .forma",
+"l.2339) (core#if (= .len.2338 3) (cons .the-core-define.2302 (cdr .form.2336)) (",
+"error \"malformed define\" .form.2336)) (core#if (pair? .formal.2339) (cons .the-d",
+"efine.2309 (cons (car .formal.2339) (cons (cons .the-lambda.2310 (cons (cdr .for",
+"mal.2339) (cddr .form.2336))) (core#quote ())))) (error \"define: binding to non-",
+"varaible object\" .form.2336)))) (cadr .form.2336)))) (length .form.2336)))) (cor",
+"e#begin (.define-transformer.2297 (core#quote define-macro) (core#lambda (.form.",
+"2340 .env.2341) (core#if (= (length .form.2340) 3) (core#if (identifier? (cadr .",
+"form.2340)) (cons .the-core-define-macro.2308 (cdr .form.2340)) (error \"define-m",
+"acro: binding to non-variable object\" .form.2340)) (error \"malformed define-macr",
+"o\" .form.2340)))) (core#begin #undefined (core#begin (.define-transformer.2297 (",
+"core#quote else) (core#lambda ._.2342 (error \"invalid use of auxiliary syntax\" (",
+"core#quote else)))) (core#begin (.define-transformer.2297 (core#quote =>) (core#",
+"lambda ._.2343 (error \"invalid use of auxiliary syntax\" (core#quote =>)))) (core",
+"#begin (.define-transformer.2297 (core#quote unquote) (core#lambda ._.2344 (erro",
+"r \"invalid use of auxiliary syntax\" (core#quote unquote)))) (core#begin (.define",
+"-transformer.2297 (core#quote unquote-splicing) (core#lambda ._.2345 (error \"inv",
+"alid use of auxiliary syntax\" (core#quote unquote-splicing)))) (core#begin (.def",
+"ine-transformer.2297 (core#quote let) (core#lambda (.form.2346 .env.2347) (core#",
+"if (identifier? (cadr .form.2346)) ((core#lambda (.name.2348 .formal.2349 .body.",
+"2350) (cons (cons .the-lambda.2310 (cons (core#quote ()) (cons (cons .the-define",
+".2309 (cons (cons .name.2348 (map car .formal.2349)) .body.2350)) (cons (cons .n",
+"ame.2348 (map cadr .formal.2349)) (core#quote ()))))) (core#quote ()))) (car (cd",
+"r .form.2346)) (car (cdr (cdr .form.2346))) (cdr (cdr (cdr .form.2346)))) ((core",
+"#lambda (.formal.2351 .body.2352) (cons (cons .the-lambda.2310 (cons (map car .f",
+"ormal.2351) .body.2352)) (map cadr .formal.2351))) (car (cdr .form.2346)) (cdr (",
+"cdr .form.2346)))))) (core#begin (.define-transformer.2297 (core#quote and) (cor",
+"e#lambda (.form.2353 .env.2354) (core#if (null? (cdr .form.2353)) #t (core#if (n",
+"ull? (cddr .form.2353)) (cadr .form.2353) (cons .the-if.2314 (cons (cadr .form.2",
+"353) (cons (cons (.the.2298 (core#quote and)) (cddr .form.2353)) (cons (core#quo",
+"te #f) (core#quote ()))))))))) (core#begin (.define-transformer.2297 (core#quote",
+" or) (core#lambda (.form.2355 .env.2356) (core#if (null? (cdr .form.2355)) #f ((",
+"core#lambda (.tmp.2357) (cons (.the.2298 (core#quote let)) (cons (cons (cons .tm",
+"p.2357 (cons (cadr .form.2355) (core#quote ()))) (core#quote ())) (cons (cons .t",
+"he-if.2314 (cons .tmp.2357 (cons .tmp.2357 (cons (cons (.the.2298 (core#quote or",
+")) (cddr .form.2355)) (core#quote ()))))) (core#quote ()))))) (make-identifier (",
+"core#quote it) .env.2356))))) (core#begin (.define-transformer.2297 (core#quote ",
+"cond) (core#lambda (.form.2358 .env.2359) ((core#lambda (.clauses.2360) (core#if",
+" (null? .clauses.2360) #undefined ((core#lambda (.clause.2361) (core#if (core#if",
+" (identifier? (car .clause.2361)) (identifier=? (.the.2298 (core#quote else)) (m",
+"ake-identifier (car .clause.2361) .env.2359)) #f) (cons .the-begin.2311 (cdr .cl",
+"ause.2361)) (core#if (null? (cdr .clause.2361)) (cons (.the.2298 (core#quote or)",
+") (cons (car .clause.2361) (cons (cons (.the.2298 (core#quote cond)) (cdr .claus",
+"es.2360)) (core#quote ())))) (core#if (core#if (identifier? (cadr .clause.2361))",
+" (identifier=? (.the.2298 (core#quote =>)) (make-identifier (cadr .clause.2361) ",
+".env.2359)) #f) ((core#lambda (.tmp.2362) (cons (.the.2298 (core#quote let)) (co",
+"ns (cons (cons .tmp.2362 (cons (car .clause.2361) (core#quote ()))) (core#quote ",
+"())) (cons (cons .the-if.2314 (cons .tmp.2362 (cons (cons (cadr (cdr .clause.236",
+"1)) (cons .tmp.2362 (core#quote ()))) (cons (cons (.the.2298 (core#quote cond)) ",
+"(cddr .form.2358)) (core#quote ()))))) (core#quote ()))))) (make-identifier (cor",
+"e#quote tmp) .env.2359)) (cons .the-if.2314 (cons (car .clause.2361) (cons (cons",
+" .the-begin.2311 (cdr .clause.2361)) (cons (cons (.the.2298 (core#quote cond)) (",
+"cdr .clauses.2360)) (core#quote ()))))))))) (car .clauses.2360)))) (cdr .form.23",
+"58)))) (core#begin (.define-transformer.2297 (core#quote quasiquote) (core#lambd",
+"a (.form.2363 .env.2364) (core#begin (core#define .quasiquote?.2365 (core#lambda",
+" (.form.2369) (core#if (pair? .form.2369) (core#if (identifier? (car .form.2369)",
+") (identifier=? (.the.2298 (core#quote quasiquote)) (make-identifier (car .form.",
+"2369) .env.2364)) #f) #f))) (core#begin (core#define .unquote?.2366 (core#lambda",
+" (.form.2370) (core#if (pair? .form.2370) (core#if (identifier? (car .form.2370)",
+") (identifier=? (.the.2298 (core#quote unquote)) (make-identifier (car .form.237",
+"0) .env.2364)) #f) #f))) (core#begin (core#define .unquote-splicing?.2367 (core#",
+"lambda (.form.2371) (core#if (pair? .form.2371) (core#if (pair? (car .form.2371)",
+") (core#if (identifier? (caar .form.2371)) (identifier=? (.the.2298 (core#quote ",
+"unquote-splicing)) (make-identifier (caar .form.2371) .env.2364)) #f) #f) #f))) ",
+"(core#begin (core#define .qq.2368 (core#lambda (.depth.2372 .expr.2373) (core#if",
+" (.unquote?.2366 .expr.2373) (core#if (= .depth.2372 1) (cadr .expr.2373) (list ",
+"(.the.2298 (core#quote list)) (list (.the.2298 (core#quote quote)) (.the.2298 (c",
+"ore#quote unquote))) (.qq.2368 (- .depth.2372 1) (car (cdr .expr.2373))))) (core",
+"#if (.unquote-splicing?.2367 .expr.2373) (core#if (= .depth.2372 1) (list (.the.",
+"2298 (core#quote append)) (car (cdr (car .expr.2373))) (.qq.2368 .depth.2372 (cd",
+"r .expr.2373))) (list (.the.2298 (core#quote cons)) (list (.the.2298 (core#quote",
+" list)) (list (.the.2298 (core#quote quote)) (.the.2298 (core#quote unquote-spli",
+"cing))) (.qq.2368 (- .depth.2372 1) (car (cdr (car .expr.2373))))) (.qq.2368 .de",
+"pth.2372 (cdr .expr.2373)))) (core#if (.quasiquote?.2365 .expr.2373) (list (.the",
+".2298 (core#quote list)) (list (.the.2298 (core#quote quote)) (.the.2298 (core#q",
+"uote quasiquote))) (.qq.2368 (+ .depth.2372 1) (car (cdr .expr.2373)))) (core#if",
+" (pair? .expr.2373) (list (.the.2298 (core#quote cons)) (.qq.2368 .depth.2372 (c",
+"ar .expr.2373)) (.qq.2368 .depth.2372 (cdr .expr.2373))) (core#if (vector? .expr",
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+"degen-e.2542 (.caddr.2452 .e.2574)) (list (reverse (.code.2534)) (reverse (.reps",
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+"bda () (core#begin (core#define .loop.2589 (core#lambda (.e.2590) ((core#lambda ",
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+"it.2594 .it.2594 ((core#lambda (.it.2595) (core#if .it.2595 .it.2595 #f)) (eqv? ",
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+" .c.2600)))))) (.loop.2598 (cadr .e.2574) 0))))) #undefined))))) (car .e.2574)))",
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+"-environment (car .env.2605)))))))))",
 };
 #endif
 
@@ -429,154 +619,154 @@ static const char boot_library_rom[][80] = {
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-".2531 .spec.2534) #undefined))) (car .spec.2534)))) (core#begin (core#set! .coll",
-"ect.2533 (core#lambda (.spec.2540) ((core#lambda (.key.2541) (core#if ((core#lam",
-"bda (.it.2542) (core#if .it.2542 .it.2542 #f)) (eqv? .key.2541 (core#quote only)",
-")) ((core#lambda (.alist.2543) (map (core#lambda (.var.2544) (assq .var.2544 .al",
-"ist.2543)) (cddr .spec.2540))) (.collect.2533 (cadr .spec.2540))) (core#if ((cor",
-"e#lambda (.it.2545) (core#if .it.2545 .it.2545 #f)) (eqv? .key.2541 (core#quote ",
-"rename))) ((core#lambda (.alist.2546 .renames.2547) (map (core#lambda (.s.2548) ",
-"((core#lambda (.it.2549) (core#if .it.2549 .it.2549 ((core#lambda (.it.2550) (co",
-"re#if .it.2550 .it.2550 #f)) .s.2548))) (assq (car .s.2548) .renames.2547))) .al",
-"ist.2546)) (.collect.2533 (cadr .spec.2540)) (map (core#lambda (.x.2551) (cons (",
-"car .x.2551) (cadr .x.2551))) (cddr .spec.2540))) (core#if ((core#lambda (.it.25",
-"52) (core#if .it.2552 .it.2552 #f)) (eqv? .key.2541 (core#quote prefix))) ((core",
-"#lambda (.alist.2553) (map (core#lambda (.s.2554) (cons (.prefix.2530 (.caddr.25",
-"29 .spec.2540) (car .s.2554)) (cdr .s.2554))) .alist.2553)) (.collect.2533 (cadr",
-" .spec.2540))) (core#if ((core#lambda (.it.2555) (core#if .it.2555 .it.2555 #f))",
-" (eqv? .key.2541 (core#quote except))) ((core#lambda (.alist.2556) ((core#lambda",
-" () (core#begin (core#define .loop.2557 (core#lambda (.alist.2558) (core#if (nul",
-"l? .alist.2558) (core#quote ()) (core#if (memq (caar .alist.2558) (cddr .spec.25",
-"40)) (.loop.2557 (cdr .alist.2558)) (cons (car .alist.2558) (.loop.2557 (cdr .al",
-"ist.2558))))))) (.loop.2557 .alist.2556))))) (.collect.2533 (cadr .spec.2540))) ",
-"(core#if #t (dictionary-map (core#lambda (.x.2559) (cons .x.2559 .x.2559)) (.lib",
-"rary-exports.2465 (.getlib.2531 .spec.2540))) #undefined)))))) (car .spec.2540))",
-")) ((core#lambda (.import.2560) (core#begin (core#set! .import.2560 (core#lambda",
-" (.spec.2561) ((core#lambda (.lib.2562 .alist.2563) (for-each (core#lambda (.slo",
-"t.2564) (.library-import.2466 .lib.2562 (cdr .slot.2564) (car .slot.2564))) .ali",
-"st.2563)) (.extract.2532 .spec.2561) (.collect.2533 .spec.2561)))) (for-each .im",
-"port.2560 (cdr .form.2527)))) #undefined)))) #undefined #undefined)) (core#lambd",
-"a (.x.2565) (car (cdr (cdr .x.2565)))) (core#lambda (.prefix.2566 .symbol.2567) ",
-"(string->symbol (string-append (symbol->string .prefix.2566) (symbol->string .sy",
-"mbol.2567)))) (core#lambda (.name.2568) (core#if (.find-library.2462 .name.2568)",
-" .name.2568 (error \"library not found\" .name.2568)))))) (.define-transformer.249",
-"7 (core#quote export) (core#lambda (.form.2569 ._.2570) ((core#lambda (.collect.",
-"2571 .export.2572) (core#begin (core#set! .collect.2571 (core#lambda (.spec.2573",
-") (core#if (symbol? .spec.2573) (cons .spec.2573 .spec.2573) (core#if (core#if (",
-"list? .spec.2573) (core#if (= (length .spec.2573) 3) (eq? (car .spec.2573) (core",
-"#quote rename)) #f) #f) (cons (list-ref .spec.2573 1) (list-ref .spec.2573 2)) (",
-"error \"malformed export\"))))) (core#begin (core#set! .export.2572 (core#lambda (",
-".spec.2574) ((core#lambda (.slot.2575) (.library-export.2467 (car .slot.2575) (c",
-"dr .slot.2575))) (.collect.2571 .spec.2574)))) (for-each .export.2572 (cdr .form",
-".2569))))) #undefined #undefined))))))) (core#lambda (.name.2576 .macro.2577) (d",
-"ictionary-set! (macro-objects) .name.2576 .macro.2577))) (core#begin ((core#lamb",
-"da () (core#begin (.make-library.2463 (core#quote (picrin base))) (core#begin (s",
-"et-car! (dictionary-ref .*libraries*.2461 (.mangle.2459 (core#quote (picrin base",
-")))) default-environment) (core#begin ((core#lambda (.exports.2578) ((core#lambd",
-"a (.export-keyword.2579) ((core#lambda () (core#begin (for-each .export-keyword.",
-"2579 (core#quote (define lambda quote set! if begin define-macro let let* letrec",
+"2631) (dictionary-set! .*libraries*.2608 .name.2630 (cons .env.2631 .exports.263",
+"2))))))) (make-environment (string->symbol (string-append (symbol->string .name.",
+"2630) \":\"))) (make-dictionary))) (.mangle.2606 .name.2629)))) (core#begin (core#",
+"define .library-environment.2611 (core#lambda (.name.2633) (car (dictionary-ref ",
+".*libraries*.2608 (.mangle.2606 .name.2633))))) (core#begin (core#define .librar",
+"y-exports.2612 (core#lambda (.name.2634) (cdr (dictionary-ref .*libraries*.2608 ",
+"(.mangle.2606 .name.2634))))) (core#begin (core#define .library-import.2613 (cor",
+"e#lambda (.name.2635 .sym.2636 .alias.2637) ((core#lambda (.uid.2638) ((core#lam",
+"bda (.env.2639) (set-identifier! .alias.2637 .uid.2638 .env.2639)) (.library-env",
+"ironment.2611 (.current-library.2607)))) (dictionary-ref (.library-exports.2612 ",
+".name.2635) .sym.2636)))) (core#begin (core#define .library-export.2614 (core#la",
+"mbda (.sym.2640 .alias.2641) ((core#lambda (.env.2642 .exports.2643) (dictionary",
+"-set! .exports.2643 .alias.2641 (find-identifier .sym.2640 .env.2642))) (.librar",
+"y-environment.2611 (.current-library.2607)) (.library-exports.2612 (.current-lib",
+"rary.2607))))) (core#begin ((core#lambda (.define-transformer.2644) (core#begin ",
+"(.define-transformer.2644 (core#quote define-library) (core#lambda (.form.2645 .",
+"_.2646) ((core#lambda (.name.2647 .body.2648) (core#begin ((core#lambda (.it.264",
+"9) (core#if .it.2649 .it.2649 ((core#lambda (.it.2650) (core#if .it.2650 .it.265",
+"0 #f)) (.make-library.2610 .name.2647)))) (.find-library.2609 .name.2647)) (with",
+"-dynamic-environment (list (cons .current-library.2607 .name.2647)) (core#lambda",
+" () (for-each (core#lambda (.expr.2651) (eval .expr.2651 .name.2647)) .body.2648",
+"))))) (cadr .form.2645) (cddr .form.2645)))) (core#begin (.define-transformer.26",
+"44 (core#quote cond-expand) (core#lambda (.form.2652 ._.2653) ((core#lambda (.te",
+"st.2654) (core#begin (core#set! .test.2654 (core#lambda (.form.2655) ((core#lamb",
+"da (.it.2656) (core#if .it.2656 .it.2656 ((core#lambda (.it.2657) (core#if .it.2",
+"657 .it.2657 ((core#lambda (.it.2658) (core#if .it.2658 .it.2658 #f)) (core#if (",
+"pair? .form.2655) ((core#lambda (.key.2659) (core#if ((core#lambda (.it.2660) (c",
+"ore#if .it.2660 .it.2660 #f)) (eqv? .key.2659 (core#quote library))) (.find-libr",
+"ary.2609 (cadr .form.2655)) (core#if ((core#lambda (.it.2661) (core#if .it.2661 ",
+".it.2661 #f)) (eqv? .key.2659 (core#quote not))) (not (.test.2654 (cadr .form.26",
+"55))) (core#if ((core#lambda (.it.2662) (core#if .it.2662 .it.2662 #f)) (eqv? .k",
+"ey.2659 (core#quote and))) ((core#lambda () (core#begin (core#define .loop.2663 ",
+"(core#lambda (.form.2664) ((core#lambda (.it.2665) (core#if .it.2665 .it.2665 ((",
+"core#lambda (.it.2666) (core#if .it.2666 .it.2666 #f)) (core#if (.test.2654 (car",
+" .form.2664)) (.loop.2663 (cdr .form.2664)) #f)))) (null? .form.2664)))) (.loop.",
+"2663 (cdr .form.2655))))) (core#if ((core#lambda (.it.2667) (core#if .it.2667 .i",
+"t.2667 #f)) (eqv? .key.2659 (core#quote or))) ((core#lambda () (core#begin (core",
+"#define .loop.2668 (core#lambda (.form.2669) (core#if (pair? .form.2669) ((core#",
+"lambda (.it.2670) (core#if .it.2670 .it.2670 ((core#lambda (.it.2671) (core#if .",
+"it.2671 .it.2671 #f)) (.loop.2668 (cdr .form.2669))))) (.test.2654 (car .form.26",
+"69))) #f))) (.loop.2668 (cdr .form.2655))))) (core#if #t #f #undefined)))))) (ca",
+"r .form.2655)) #f)))) (core#if (symbol? .form.2655) (memq .form.2655 (features))",
+" #f)))) (eq? .form.2655 (core#quote else))))) ((core#lambda () (core#begin (core",
+"#define .loop.2672 (core#lambda (.clauses.2673) (core#if (null? .clauses.2673) #",
+"undefined (core#if (.test.2654 (caar .clauses.2673)) (cons (make-identifier (cor",
+"e#quote begin) default-environment) (append (cdar .clauses.2673) (core#quote ())",
+")) (.loop.2672 (cdr .clauses.2673)))))) (.loop.2672 (cdr .form.2652))))))) #unde",
+"fined))) (core#begin (.define-transformer.2644 (core#quote import) (core#lambda ",
+"(.form.2674 ._.2675) ((core#lambda (.caddr.2676 .prefix.2677 .getlib.2678) ((cor",
+"e#lambda (.extract.2679 .collect.2680) (core#begin (core#set! .extract.2679 (cor",
+"e#lambda (.spec.2681) ((core#lambda (.key.2682) (core#if ((core#lambda (.it.2683",
+") (core#if .it.2683 .it.2683 ((core#lambda (.it.2684) (core#if .it.2684 .it.2684",
+" ((core#lambda (.it.2685) (core#if .it.2685 .it.2685 ((core#lambda (.it.2686) (c",
+"ore#if .it.2686 .it.2686 #f)) (eqv? .key.2682 (core#quote except))))) (eqv? .key",
+".2682 (core#quote prefix))))) (eqv? .key.2682 (core#quote rename))))) (eqv? .key",
+".2682 (core#quote only))) (.extract.2679 (cadr .spec.2681)) (core#if #t (.getlib",
+".2678 .spec.2681) #undefined))) (car .spec.2681)))) (core#begin (core#set! .coll",
+"ect.2680 (core#lambda (.spec.2687) ((core#lambda (.key.2688) (core#if ((core#lam",
+"bda (.it.2689) (core#if .it.2689 .it.2689 #f)) (eqv? .key.2688 (core#quote only)",
+")) ((core#lambda (.alist.2690) (map (core#lambda (.var.2691) (assq .var.2691 .al",
+"ist.2690)) (cddr .spec.2687))) (.collect.2680 (cadr .spec.2687))) (core#if ((cor",
+"e#lambda (.it.2692) (core#if .it.2692 .it.2692 #f)) (eqv? .key.2688 (core#quote ",
+"rename))) ((core#lambda (.alist.2693 .renames.2694) (map (core#lambda (.s.2695) ",
+"((core#lambda (.it.2696) (core#if .it.2696 .it.2696 ((core#lambda (.it.2697) (co",
+"re#if .it.2697 .it.2697 #f)) .s.2695))) (assq (car .s.2695) .renames.2694))) .al",
+"ist.2693)) (.collect.2680 (cadr .spec.2687)) (map (core#lambda (.x.2698) (cons (",
+"car .x.2698) (cadr .x.2698))) (cddr .spec.2687))) (core#if ((core#lambda (.it.26",
+"99) (core#if .it.2699 .it.2699 #f)) (eqv? .key.2688 (core#quote prefix))) ((core",
+"#lambda (.alist.2700) (map (core#lambda (.s.2701) (cons (.prefix.2677 (.caddr.26",
+"76 .spec.2687) (car .s.2701)) (cdr .s.2701))) .alist.2700)) (.collect.2680 (cadr",
+" .spec.2687))) (core#if ((core#lambda (.it.2702) (core#if .it.2702 .it.2702 #f))",
+" (eqv? .key.2688 (core#quote except))) ((core#lambda (.alist.2703) ((core#lambda",
+" () (core#begin (core#define .loop.2704 (core#lambda (.alist.2705) (core#if (nul",
+"l? .alist.2705) (core#quote ()) (core#if (memq (caar .alist.2705) (cddr .spec.26",
+"87)) (.loop.2704 (cdr .alist.2705)) (cons (car .alist.2705) (.loop.2704 (cdr .al",
+"ist.2705))))))) (.loop.2704 .alist.2703))))) (.collect.2680 (cadr .spec.2687))) ",
+"(core#if #t (dictionary-map (core#lambda (.x.2706) (cons .x.2706 .x.2706)) (.lib",
+"rary-exports.2612 (.getlib.2678 .spec.2687))) #undefined)))))) (car .spec.2687))",
+")) ((core#lambda (.import.2707) (core#begin (core#set! .import.2707 (core#lambda",
+" (.spec.2708) ((core#lambda (.lib.2709 .alist.2710) (for-each (core#lambda (.slo",
+"t.2711) (.library-import.2613 .lib.2709 (cdr .slot.2711) (car .slot.2711))) .ali",
+"st.2710)) (.extract.2679 .spec.2708) (.collect.2680 .spec.2708)))) (for-each .im",
+"port.2707 (cdr .form.2674)))) #undefined)))) #undefined #undefined)) (core#lambd",
+"a (.x.2712) (car (cdr (cdr .x.2712)))) (core#lambda (.prefix.2713 .symbol.2714) ",
+"(string->symbol (string-append (symbol->string .prefix.2713) (symbol->string .sy",
+"mbol.2714)))) (core#lambda (.name.2715) (core#if (.find-library.2609 .name.2715)",
+" .name.2715 (error \"library not found\" .name.2715)))))) (.define-transformer.264",
+"4 (core#quote export) (core#lambda (.form.2716 ._.2717) ((core#lambda (.collect.",
+"2718 .export.2719) (core#begin (core#set! .collect.2718 (core#lambda (.spec.2720",
+") (core#if (symbol? .spec.2720) (cons .spec.2720 .spec.2720) (core#if (core#if (",
+"list? .spec.2720) (core#if (= (length .spec.2720) 3) (eq? (car .spec.2720) (core",
+"#quote rename)) #f) #f) (cons (list-ref .spec.2720 1) (list-ref .spec.2720 2)) (",
+"error \"malformed export\"))))) (core#begin (core#set! .export.2719 (core#lambda (",
+".spec.2721) ((core#lambda (.slot.2722) (.library-export.2614 (car .slot.2722) (c",
+"dr .slot.2722))) (.collect.2718 .spec.2721)))) (for-each .export.2719 (cdr .form",
+".2716))))) #undefined #undefined))))))) (core#lambda (.name.2723 .macro.2724) (d",
+"ictionary-set! (macro-objects) .name.2723 .macro.2724))) (core#begin ((core#lamb",
+"da () (core#begin (.make-library.2610 (core#quote (picrin base))) (core#begin (s",
+"et-car! (dictionary-ref .*libraries*.2608 (.mangle.2606 (core#quote (picrin base",
+")))) default-environment) (core#begin ((core#lambda (.exports.2725) ((core#lambd",
+"a (.export-keyword.2726) ((core#lambda () (core#begin (for-each .export-keyword.",
+"2726 (core#quote (define lambda quote set! if begin define-macro let let* letrec",
 " letrec* let-values let*-values define-values quasiquote unquote unquote-splicin",
 "g and or cond case else => do when unless parameterize define-record-type))) (co",
-"re#begin (.export-keyword.2579 (core#quote boolean?)) (dictionary-for-each .expo",
-"rt-keyword.2579 (global-objects))))))) (core#lambda (.keyword.2580) (dictionary-",
-"set! .exports.2578 .keyword.2580 .keyword.2580)))) (.library-exports.2465 (core#",
-"quote (picrin base)))) (core#begin (core#set! eval ((core#lambda (.e.2581) (core",
-"#lambda (.expr.2582 . .lib.2583) ((core#lambda (.lib.2584) (with-dynamic-environ",
-"ment (list (cons .current-library.2460 .lib.2584)) (core#lambda () (.e.2581 .exp",
-"r.2582 (.library-environment.2464 .lib.2584))))) (core#if (null? .lib.2583) (.cu",
-"rrent-library.2460) (car .lib.2583))))) eval)) (.make-library.2463 (core#quote (",
-"picrin user))))))))) (values .current-library.2460 .find-library.2462 .make-libr",
-"ary.2463 .library-environment.2464 .library-exports.2465 .library-import.2466 .l",
-"ibrary-export.2467))))))))))))))) (core#lambda (.current-library.2585 .find-libr",
-"ary.2586 .make-library.2587 .library-environment.2588 .library-exports.2589 .lib",
-"rary-import.2590 .library-export.2591) (core#begin (core#set! current-library .c",
-"urrent-library.2585) (core#begin (core#set! find-library .find-library.2586) (co",
-"re#begin (core#set! make-library .make-library.2587) (core#begin (core#set! libr",
-"ary-environment .library-environment.2588) (core#begin (core#set! library-export",
-"s .library-exports.2589) (core#begin (core#set! library-import .library-import.2",
-"590) (core#set! library-export .library-export.2591))))))))))))))))",
+"re#begin (.export-keyword.2726 (core#quote boolean?)) (dictionary-for-each .expo",
+"rt-keyword.2726 (global-objects))))))) (core#lambda (.keyword.2727) (dictionary-",
+"set! .exports.2725 .keyword.2727 .keyword.2727)))) (.library-exports.2612 (core#",
+"quote (picrin base)))) (core#begin (core#set! eval ((core#lambda (.e.2728) (core",
+"#lambda (.expr.2729 . .lib.2730) ((core#lambda (.lib.2731) (with-dynamic-environ",
+"ment (list (cons .current-library.2607 .lib.2731)) (core#lambda () (.e.2728 .exp",
+"r.2729 (.library-environment.2611 .lib.2731))))) (core#if (null? .lib.2730) (.cu",
+"rrent-library.2607) (car .lib.2730))))) eval)) (.make-library.2610 (core#quote (",
+"picrin user))))))))) (values .current-library.2607 .find-library.2609 .make-libr",
+"ary.2610 .library-environment.2611 .library-exports.2612 .library-import.2613 .l",
+"ibrary-export.2614))))))))))))))) (core#lambda (.current-library.2732 .find-libr",
+"ary.2733 .make-library.2734 .library-environment.2735 .library-exports.2736 .lib",
+"rary-import.2737 .library-export.2738) (core#begin (core#set! current-library .c",
+"urrent-library.2732) (core#begin (core#set! find-library .find-library.2733) (co",
+"re#begin (core#set! make-library .make-library.2734) (core#begin (core#set! libr",
+"ary-environment .library-environment.2735) (core#begin (core#set! library-export",
+"s .library-exports.2736) (core#begin (core#set! library-import .library-import.2",
+"737) (core#set! library-export .library-export.2738))))))))))))))))",
 };
 #endif
 
diff --git a/piclib/compile.scm b/piclib/compile.scm
index 8ebe5d91..b25717ab 100644
--- a/piclib/compile.scm
+++ b/piclib/compile.scm
@@ -1,246 +1,256 @@
-(define-values (make-identifier
-                identifier?
-                identifier=?
-                identifier-name
-                identifier-environment
-                make-environment
-                default-environment
-                environment?
-                find-identifier
-                add-identifier!
-                set-identifier!
-                macro-objects
-                compile
-                eval)
+(begin
+
+  ;; expand
+
+  (define-values (make-identifier
+                  identifier?
+                  identifier=?
+                  identifier-name
+                  identifier-environment
+                  make-environment
+                  default-environment
+                  environment?
+                  find-identifier
+                  add-identifier!
+                  set-identifier!
+                  macro-objects
+                  expand)
+    (let ()
+
+      ;; identifier
+
+      (define-record-type identifier
+          (make-identifier name env)
+          %identifier?
+        (name identifier-name)
+        (env identifier-environment))
+
+      (define (identifier? obj)
+        (or (symbol? obj) (%identifier? obj)))
+
+      (define (identifier=? id1 id2)
+        (cond
+         ((and (symbol? id1) (symbol? id2))
+          (eq? id1 id2))
+         ((and (%identifier? id1) (%identifier? id2))
+          (eq? (find-identifier (identifier-name id1) (identifier-environment id1))
+               (find-identifier (identifier-name id2) (identifier-environment id2))))
+         (else
+          #f)))
+
+      (set! equal?
+            (let ((e? equal?))
+              (lambda (x y)
+                (if (%identifier? x)
+                    (identifier=? x y)
+                    (e? x y)))))
+
+
+      ;; environment
+
+      (define-record-type environment
+          (%make-environment parent prefix binding)
+          environment?
+        (parent  environment-parent)
+        (prefix  environment-prefix)
+        (binding environment-binding))
+
+      (define (search-scope id env)
+        ((environment-binding env) id))
+
+      (define (find-identifier id env)
+        (or (search-scope id env)
+            (let ((parent (environment-parent env)))
+              (if parent
+                  (find-identifier id parent)
+                  (if (symbol? id)
+                      (add-identifier! id env)
+                      (find-identifier (identifier-name id)
+                                       (identifier-environment id)))))))
+
+      (define add-identifier!
+        (let ((uniq
+               (let ((n 0))
+                 (lambda (id)
+                   (let ((m n))
+                     (set! n (+ n 1))
+                     (string->symbol
+                      (string-append
+                       "."
+                       (symbol->string
+                        (let loop ((id id))
+                          (if (symbol? id)
+                              id
+                              (loop (identifier-name id)))))
+                       "."
+                       (number->string m))))))))
+          (lambda (id env)
+            (or (search-scope id env)
+                (if (and (not (environment-parent env)) (symbol? id))
+                    (string->symbol
+                     (string-append
+                      (environment-prefix env)
+                      (symbol->string id)))
+                    (let ((uid (uniq id)))
+                      (set-identifier! id uid env)
+                      uid))))))
+
+      (define (set-identifier! id uid env)
+        ((environment-binding env) id uid))
+
+      (define (make-environment prefix)
+        (%make-environment #f (symbol->string prefix) (make-ephemeron-table)))
+
+      (define default-environment
+        (let ((env (make-environment (string->symbol ""))))
+          (for-each
+           (lambda (x) (set-identifier! x x env))
+           '(core#define
+             core#set!
+             core#quote
+             core#lambda
+             core#if
+             core#begin
+             core#define-macro))
+          env))
+
+      (define (extend-environment parent)
+        (%make-environment parent #f (make-ephemeron-table)))
+
+
+      ;; macro
+
+      (define global-macro-table
+        (make-dictionary))
+
+      (define (find-macro uid)
+        (and (dictionary-has? global-macro-table uid)
+             (dictionary-ref global-macro-table uid)))
+
+      (define (add-macro! uid expander) ; TODO warn on redefinition
+        (dictionary-set! global-macro-table uid expander))
+
+      (define (shadow-macro! uid)
+        (when (dictionary-has? global-macro-table uid)
+          (dictionary-delete! global-macro-table uid)))
+
+      (define (macro-objects)
+        global-macro-table)
+
+
+      ;; expander
+
+      (define expand
+        (let ((task-queue (make-parameter '())))
+
+          (define (queue task)
+            (let ((tmp (cons #f #f)))
+              (task-queue `((,tmp . ,task) . ,(task-queue)))
+              tmp))
+
+          (define (run-all)
+            (for-each
+             (lambda (x)
+               (let ((task (cdr x)) (skelton (car x)))
+                 (let ((x (task)))
+                   (set-car! skelton (car x))
+                   (set-cdr! skelton (cdr x)))))
+             (reverse (task-queue))))
+
+          (define (caddr x) (car (cddr x)))
+
+          (define (map* proc list*)
+            (cond
+             ((null? list*) list*)
+             ((pair? list*) (cons (proc (car list*)) (map* proc (cdr list*))))
+             (else (proc list*))))
+
+          (define (literal? x)
+            (not (or (identifier? x) (pair? x))))
+
+          (define (call? x)
+            (and (list? x)
+                 (not (null? x))
+                 (identifier? (car x))))
+
+          (define (expand-variable var env)
+            (let ((x (find-identifier var env)))
+              (let ((m (find-macro x)))
+                (if m
+                    (expand-node (m var env) env)
+                    x))))
+
+          (define (expand-quote obj)
+            `(core#quote ,obj))
+
+          (define (expand-define var form env)
+            (let ((uid (add-identifier! var env)))
+              (shadow-macro! uid)
+              `(core#define ,uid ,(expand-node form env))))
+
+          (define (expand-lambda args body env)
+            (let ((env (extend-environment env)))
+              (let ((args (map* (lambda (var) (add-identifier! var env)) args)))
+                (parameterize ((task-queue '()))
+                  (let ((body (expand-node body env)))
+                    (run-all)
+                    `(core#lambda ,args ,body))))))
+
+          (define (expand-define-macro var transformer env)
+            (let ((uid (add-identifier! var env)))
+              (let ((expander (load (expand transformer env))))
+                (add-macro! uid expander)
+                #undefined)))
+
+          (define (expand-node expr env)
+            (cond
+             ((literal? expr) expr)
+             ((identifier? expr) (expand-variable expr env))
+             ((call? expr)
+              (let ((functor (find-identifier (car expr) env)))
+                (case functor
+                  ((core#quote) (expand-quote (cadr expr)))
+                  ((core#define) (expand-define (cadr expr) (caddr expr) env))
+                  ((core#lambda) (queue (lambda () (expand-lambda (cadr expr) (caddr expr) env))))
+                  ((core#define-macro) (expand-define-macro (cadr expr) (caddr expr) env))
+                  (else
+                   (let ((m (find-macro functor)))
+                     (if m
+                         (expand-node (m expr env) env)
+                         (map (lambda (x) (expand-node x env)) expr)))))))
+             ((list? expr)
+              (map (lambda (x) (expand-node x env)) expr))
+             (else
+              (error "invalid expression" expr))))
+
+          (define (expand expr env)
+            (let ((x (expand-node expr env)))
+              (run-all)
+              x))
+
+          expand))
+
+      (values make-identifier
+              identifier?
+              identifier=?
+              identifier-name
+              identifier-environment
+              make-environment
+              default-environment
+              environment?
+              find-identifier
+              add-identifier!
+              set-identifier!
+              macro-objects
+              expand)))
+
+
+  ;; built-in macros
+
   (let ()
 
-    ;; identifier
-
-    (define-record-type identifier
-        (make-identifier name env)
-        %identifier?
-      (name identifier-name)
-      (env identifier-environment))
-
-    (define (identifier? obj)
-      (or (symbol? obj) (%identifier? obj)))
-
-    (define (identifier=? id1 id2)
-      (cond
-       ((and (symbol? id1) (symbol? id2))
-        (eq? id1 id2))
-       ((and (%identifier? id1) (%identifier? id2))
-        (eq? (find-identifier (identifier-name id1) (identifier-environment id1))
-             (find-identifier (identifier-name id2) (identifier-environment id2))))
-       (else
-        #f)))
-
-    (set! equal?
-          (let ((e? equal?))
-            (lambda (x y)
-              (if (%identifier? x)
-                  (identifier=? x y)
-                  (e? x y)))))
-
-
-    ;; environment
-
-    (define-record-type environment
-        (%make-environment parent prefix binding)
-        environment?
-      (parent  environment-parent)
-      (prefix  environment-prefix)
-      (binding environment-binding))
-
-    (define (search-scope id env)
-      ((environment-binding env) id))
-
-    (define (find-identifier id env)
-      (or (search-scope id env)
-          (let ((parent (environment-parent env)))
-            (if parent
-                (find-identifier id parent)
-                (if (symbol? id)
-                    (add-identifier! id env)
-                    (find-identifier (identifier-name id)
-                                     (identifier-environment id)))))))
-
-    (define add-identifier!
-      (let ((uniq
-             (let ((n 0))
-               (lambda (id)
-                 (let ((m n))
-                   (set! n (+ n 1))
-                   (string->symbol
-                    (string-append
-                     "."
-                     (symbol->string
-                      (let loop ((id id))
-                        (if (symbol? id)
-                            id
-                            (loop (identifier-name id)))))
-                     "."
-                     (number->string m))))))))
-        (lambda (id env)
-          (or (search-scope id env)
-              (if (and (not (environment-parent env)) (symbol? id))
-                  (string->symbol
-                   (string-append
-                    (environment-prefix env)
-                    (symbol->string id)))
-                  (let ((uid (uniq id)))
-                    (set-identifier! id uid env)
-                    uid))))))
-
-    (define (set-identifier! id uid env)
-      ((environment-binding env) id uid))
-
-    (define (make-environment prefix)
-      (%make-environment #f (symbol->string prefix) (make-ephemeron-table)))
-
-    (define default-environment
-      (let ((env (make-environment (string->symbol ""))))
-        (for-each
-         (lambda (x) (set-identifier! x x env))
-         '(core#define
-           core#set!
-           core#quote
-           core#lambda
-           core#if
-           core#begin
-           core#define-macro))
-        env))
-
-    (define (extend-environment parent)
-      (%make-environment parent #f (make-ephemeron-table)))
-
-
-    ;; macro
-
-    (define global-macro-table
-      (make-dictionary))
-
-    (define (find-macro uid)
-      (and (dictionary-has? global-macro-table uid)
-           (dictionary-ref global-macro-table uid)))
-
-    (define (add-macro! uid expander)    ; TODO warn on redefinition
-      (dictionary-set! global-macro-table uid expander))
-
-    (define (shadow-macro! uid)
-      (when (dictionary-has? global-macro-table uid)
-        (dictionary-delete! global-macro-table uid)))
-
-    (define (macro-objects)
-      global-macro-table)
-
-
-    ;; expander
-
-    (define expand
-      (let ((task-queue (make-parameter '())))
-
-        (define (queue task)
-          (let ((tmp (cons #f #f)))
-            (task-queue `((,tmp . ,task) . ,(task-queue)))
-            tmp))
-
-        (define (run-all)
-          (for-each
-           (lambda (x)
-             (let ((task (cdr x)) (skelton (car x)))
-               (let ((x (task)))
-                 (set-car! skelton (car x))
-                 (set-cdr! skelton (cdr x)))))
-           (reverse (task-queue))))
-
-        (define (caddr x) (car (cddr x)))
-
-        (define (map* proc list*)
-          (cond
-           ((null? list*) list*)
-           ((pair? list*) (cons (proc (car list*)) (map* proc (cdr list*))))
-           (else (proc list*))))
-
-        (define (literal? x)
-          (not (or (identifier? x) (pair? x))))
-
-        (define (call? x)
-          (and (list? x)
-               (not (null? x))
-               (identifier? (car x))))
-
-        (define (expand-variable var env)
-          (let ((x (find-identifier var env)))
-            (let ((m (find-macro x)))
-              (if m
-                  (expand-node (m var env) env)
-                  x))))
-
-        (define (expand-quote obj)
-          `(core#quote ,obj))
-
-        (define (expand-define var form env)
-          (let ((uid (add-identifier! var env)))
-            (shadow-macro! uid)
-            `(core#define ,uid ,(expand-node form env))))
-
-        (define (expand-lambda args body env)
-          (let ((env (extend-environment env)))
-            (let ((args (map* (lambda (var) (add-identifier! var env)) args)))
-              (parameterize ((task-queue '()))
-                (let ((body (expand-node body env)))
-                  (run-all)
-                  `(core#lambda ,args ,body))))))
-
-        (define (expand-define-macro var transformer env)
-          (let ((uid (add-identifier! var env)))
-            (let ((expander (load (expand transformer env))))
-              (add-macro! uid expander)
-              #undefined)))
-
-        (define (expand-node expr env)
-          (cond
-           ((literal? expr) expr)
-           ((identifier? expr) (expand-variable expr env))
-           ((call? expr)
-            (let ((functor (find-identifier (car expr) env)))
-              (case functor
-                ((core#quote) (expand-quote (cadr expr)))
-                ((core#define) (expand-define (cadr expr) (caddr expr) env))
-                ((core#lambda) (queue (lambda () (expand-lambda (cadr expr) (caddr expr) env))))
-                ((core#define-macro) (expand-define-macro (cadr expr) (caddr expr) env))
-                (else
-                 (let ((m (find-macro functor)))
-                   (if m
-                       (expand-node (m expr env) env)
-                       (map (lambda (x) (expand-node x env)) expr)))))))
-           ((list? expr)
-            (map (lambda (x) (expand-node x env)) expr))
-           (else
-            (error "invalid expression" expr))))
-
-        (define (expand expr env)
-          (let ((x (expand-node expr env)))
-            (run-all)
-            x))
-
-        expand))
-
-    ;; compile
-
-    (define (compile expr . env)
-      (expand expr (if (null? env) default-environment (car env))))
-
-    ;; eval
-
-    (define (eval expr . env)
-      (load (compile expr (if (null? env) default-environment (car env)))))
-
-    ;; built-in macros
-
     (define (define-transformer name transformer)
-      (dictionary-set! global-macro-table name transformer))
+      (dictionary-set! (macro-objects) name transformer))
 
     (define (the var)
       (make-identifier var default-environment))
@@ -601,20 +611,275 @@
                                                              (,the-if (,pred obj)
                                                                       (,(the 'vector-set!) (,(the 'record-datum) obj) ,pos value)
                                                                       (,(the 'error) "record type mismatch" obj ',type))))))))
-                           (loop (cdr fields) (+ pos 1) `(,@defs . ,acc)))))))))))
+                           (loop (cdr fields) (+ pos 1) `(,@defs . ,acc))))))))))))
 
-    (values make-identifier
-            identifier?
-            identifier=?
-            identifier-name
-            identifier-environment
-            make-environment
-            default-environment
-            environment?
-            find-identifier
-            add-identifier!
-            set-identifier!
-            macro-objects
-            compile
-            eval)))
+  ;; compile
+
+  (define-values (compile)
+    (let ()
+
+      (define (caddr x) (car (cddr x)))
+      (define (cadddr x) (cadr (cddr x)))
+      (define (max a b) (if (< a b) b a))
+      (define (integer? n) (and (number? n) (exact? n)))
+
+      (define normalize
+        (let ((defs (make-parameter '())))
+
+          ;; 1. remove core# prefix from keywords
+          ;; 2. eliminates internal definitions by replacing with equivalent let & set!
+          ;; 3. transform a var into (ref var)
+          ;; 4. wrap raw constants with quote
+
+          ;; TODO: warn redefinition, warn duplicate variables
+
+          (define (normalize e)
+            (cond
+             ((symbol? e) `(ref ,e))
+             ((not (pair? e)) `(quote ,e))
+             (else
+              (case (car e)
+                ((core#quote) `(quote . ,(cdr e)))
+                ((core#define)
+                 (let ((var (cadr e)) (val (caddr e)))
+                   (defs (cons var (defs)))
+                   `(set! ,var ,(normalize val))))
+                ((core#lambda)
+                 (let ((args (cadr e)) (body (caddr e)))
+                   (parameterize ((defs '()))
+                     (let ((body (normalize body)))
+                       (if (null? (defs))
+                           `(lambda ,args ,body)
+                           `(lambda ,args
+                              ((lambda ,(defs) ,body) ,@(map (lambda (_) #f) (defs)))))))))
+                ((core#set!) `(set! . ,(map normalize (cdr e))))
+                ((core#if) `(if . ,(map normalize (cdr e))))
+                ((core#begin) `(begin . ,(map normalize (cdr e))))
+                (else
+                 (map normalize e))))))
+
+          normalize))
+
+
+      (define transform
+        (let ()
+
+          ;; tail-conscious higher-order CPS transformation
+
+          ;; target language
+          ;; E ::= A
+          ;;     | (if A E E)
+          ;;     | (set! v A E)
+          ;;     | (A A ...)
+          ;; A ::= (lambda (var ...) E)
+          ;;     | (ref v)
+          ;;     | (quote x)
+          ;;     | (undefined)
+
+          (define uniq
+            (let ((n 0))
+              (lambda ()
+                (set! n (+ n 1))
+                (string->symbol
+                 (string-append "$" (number->string n))))))
+
+          (define (transform-k e k)
+            (case (car e)
+              ((ref lambda quote) (k (transform-v e)))
+              ((begin) (transform-k (cadr e)
+                                    (lambda (_)
+                                      (transform-k (caddr e) k))))
+              ((set!) (transform-k (caddr e)
+                                   (lambda (v)
+                                     `(set! ,(cadr e) ,v ,(k '(undefined))))))
+              ((if) (let ((v (uniq))
+                          (c `(ref ,(uniq))))
+                      `((lambda (,c)
+                          ,(transform-k (cadr e)
+                                        (lambda (x)
+                                          `(if ,x
+                                               ,(transform-c (caddr e) c)
+                                               ,(transform-c (cadddr e) c)))))
+                        (lambda (,v) ,(k `(ref ,v))))))
+              (else
+               (let* ((v (uniq))
+                      (c `(lambda (,v) ,(k `(ref ,v)))))
+                 (transform-k (car e)
+                              (lambda (f)
+                                (transform*-k (cdr e)
+                                              (lambda (args)
+                                                `(,f ,c ,@args)))))))))
+
+          (define (transform*-k es k)
+            (if (null? es)
+                (k '())
+                (transform-k (car es)
+                             (lambda (x)
+                               (transform*-k (cdr es)
+                                             (lambda (xs)
+                                               (k (cons x xs))))))))
+
+          (define (transform-c e c)
+            (case (car e)
+              ((ref lambda quote) `(,c ,(transform-v e)))
+              ((begin) (transform-k (cadr e)
+                                    (lambda (_)
+                                      (transform-c (caddr e) c))))
+              ((set!) (transform-k (caddr e)
+                                   (lambda (v)
+                                     `(set! ,(cadr e) ,v (,c (undefined))))))
+              ((if) (if (and (pair? c) (eq? 'lambda (car c)))
+                        (let ((k `(ref ,(uniq))))
+                          `((lambda (,k)
+                              ,(transform-k (cadr e)
+                                            (lambda (x)
+                                              `(if ,x
+                                                   ,(transform-c (caddr e) k)
+                                                   ,(transform-c (cadddr e) k)))))
+                            ,c))
+                        (transform-k (cadr e)
+                                     (lambda (x)
+                                       `(if ,x
+                                            ,(transform-c (caddr e) c)
+                                            ,(transform-c (cadddr e) c))))))
+              (else
+               (transform-k (car e)
+                            (lambda (f)
+                              (transform*-k (cdr e)
+                                            (lambda (args)
+                                              `(,f ,c ,@args))))))))
+
+          (define (transform-v e)
+            (case (car e)
+              ((ref quote) e)
+              ((lambda)
+               (let ((k (uniq)))
+                 `(lambda (,k ,@(cadr e)) ,(transform-c (caddr e) `(ref ,k)))))))
+
+          (lambda (e)
+            (let ((k (uniq)))
+              `(lambda (,k) ,(transform-c e `(ref ,k)))))))
+
+
+      (define codegen
+        (let ()
+
+          ;; TODO: check range of index/depth/frame_size/irepc/objc
+
+          (define (lookup var env)
+            (let up ((depth 0) (env env))
+              (if (null? env)
+                  `(global ,var)
+                  (let loop ((index 1) (binding (car env)))
+                    (if (symbol? binding)
+                        (if (eq? var binding)
+                            `(local ,depth ,index)
+                            (up (+ depth 1) (cdr env)))
+                        (if (null? binding)
+                            (up (+ depth 1) (cdr env))
+                            (if (eq? var (car binding))
+                                `(local ,depth ,index)
+                                (loop (+ index 1) (cdr binding)))))))))
+
+          (define env (make-parameter '()))
+          (define code (make-parameter '()))
+          (define reps (make-parameter '()))
+          (define objs (make-parameter '()))
+
+          (define (emit inst)
+            (code (cons inst (code))))
+
+          (define (emit-irep irep)
+            (let ((n (length (reps))))
+              (reps (cons irep (reps)))
+              n))
+
+          (define (emit-objs obj)       ; TODO remove duplicates
+            (let ((n (length (objs))))
+              (objs (cons obj (objs)))
+              n))
+
+          (define make-label
+            (let ((n 0))
+              (lambda ()
+                (let ((m n))
+                  (set! n (+ n 1))
+                  m))))
+
+          (define (emit-label label)
+            (code (cons label (code))))
+
+          (define (codegen-e e)
+            (case (car e)
+              ((ref lambda quote undefined) (codegen-a e 0))
+              ((set!) (begin
+                        (codegen-a (caddr e) 0)
+                        (let* ((x (lookup (cadr e) (env)))
+                               (op (if (eq? 'global (car x)) 'GSET 'LSET)))
+                          (emit `(,op 0 . ,(cdr x))))
+                        (codegen-e (cadddr e))))
+              ((if) (begin
+                      (codegen-a (cadr e) 0)
+                      (let ((label (make-label)))
+                        (emit `(COND 0 ,label))
+                        (codegen-e (caddr e))
+                        (emit-label label)
+                        (codegen-e (cadddr e)))))
+              (else (begin
+                      (let loop ((i 0) (e e))
+                        (unless (null? e)
+                          (codegen-a (car e) i)
+                          (loop (+ i 1) (cdr e))))
+                      (emit `(CALL ,(length e)))))))
+
+          (define (codegen-a e i)
+            (case (car e)
+              ((ref) (let* ((x (lookup (cadr e) (env)))
+                            (op (if (eq? 'global (car x)) 'GREF 'LREF)))
+                       (emit `(,op ,i . ,(cdr x)))))
+              ((quote) (let ((obj (cadr e)))
+                         (cond ((eq? #t obj) (emit `(LOADT ,i)))
+                               ((eq? #f obj) (emit `(LOADF ,i)))
+                               ((null? obj) (emit `(LOADN ,i)))
+                               ((and (integer? obj) (<= -128 obj 127)) (emit `(LOADI ,i ,obj)))
+                               (else (let ((n (emit-obj obj)))
+                                       (emit `(LOAD ,i ,n)))))))
+              ((undefined) (emit `(LOADU ,i)))
+              ((lambda) (let ((frame-size
+                               (let loop ((e (caddr e)))
+                                 (case (car e)
+                                   ((ref lambda quote undefined) 1)
+                                   ((if) (max (loop (caddr e)) (loop (cadddr e))))
+                                   ((set!) (loop (cadddr e)))
+                                   (else (+ 1 (length e))))))
+                              (argc-varg
+                               (let loop ((args (cadr e)) (c 0))
+                                 (if (symbol? args)
+                                     (cons (+ 1 c) #t)
+                                     (if (null? args)
+                                         (cons c #f)
+                                         (loop (cdr args) (+ 1 c)))))))
+                          (let ((irep
+                                 (parameterize ((code '())
+                                                (env (cons (cadr e) (env)))
+                                                (reps '())
+                                                (objs '()))
+                                   (codegen-e (caddr e))
+                                   (list (reverse (code)) (reverse (reps)) (reverse (objs)) argc-varg frame-size))))
+                            (let ((n (emit-irep irep)))
+                              (emit `(PROC ,i ,n))))))))
+
+          (lambda (e)
+            (parameterize ((code '()) (env '()) (reps '()) (objs '()))
+              (codegen-e e)
+              (car (reps))))))
+
+      (lambda (e)
+        (codegen (transform (normalize e))))))
+
+
+  ;; eval
+
+  (define (eval expr . env)
+    (load (expand expr (if (null? env) default-environment (car env))))))