summaryrefslogtreecommitdiffstats
path: root/README
diff options
context:
space:
mode:
Diffstat (limited to 'README')
-rw-r--r--README568
1 files changed, 282 insertions, 286 deletions
diff --git a/README b/README
index 45697b4..f981fd9 100644
--- a/README
+++ b/README
@@ -1,93 +1,96 @@
-This directory contains the distribution of scm5c3. Scm conforms to
+This directory contains the distribution of scm5d2. Scm conforms to
Revised^5 Report on the Algorithmic Language Scheme and the IEEE P1178
-specification. Scm runs under VMS, MS-DOS, OS2, MacOS, Amiga,
-Atari-ST, NOS/VE, Unix and similar systems.
-
-This file consists mainly of excerpts from "scm.info", the result of
-compiling (with makeinfo) "scm.texi" to `info' form. In case of
-conflicts with "scm.info", consult "scm.info".
-
-The author can be reached at <jaffer@ai.mit.edu>
-
- MANIFEST
-
- `README' is this file. It contains a MANIFEST, INSTALLATION
- INSTRUCTIONS, hints for EDITING SCHEME CODE, and a TROUBLE
- SHOOTING GUIDE.
- `COPYING' details the LACK OF WARRANTY for scm and the conditions
- for distributing scm.
- `scm.1' is the unix style man page in nroff format.
- `scm.doc' is the text man page generated from scm.1.
- `QUICKREF' is a Quick Reference card for IEEE and R4RS.
- `scm.texi' details feature support and enhancements to Scheme and
- contains a SCHEME BIBLIOGRAPHY.
- `ChangeLog' documents changes to the scm.
-
- `r4rstest.scm' is Scheme code which tests conformance with Scheme
- specifications.
- `example.scm' is Scheme code from Revised^4 Report on the
- Algorithmic Language Scheme which uses inexact numbers.
- `pi.scm' is Scheme code for computing digits of pi [type (pi 100 5)]
- which can be used to test the performance of scm against
- compiled C code [cc -o pi pi.c;time pi 100 5].
- `pi.c' is C code for computing digits of pi.
- `bench.scm' is Scheme code for computing and recording speed of
- "pi.scm".
-
- `Makefile' is for building scmlit using the `make' program.
- `build.scm' creates a database and program for compiling and linking
- new SCM executables, libraries, and dlls.
- `build.bat' invokes build.scm on MS-DOS platforms.
- `mkimpcat.scm' build SCM-specific catalog for SLIB.
- `disarm.scm' disables file opening and modifications.
- `.gdbinit' provides commands for debugging SCM with GDB.
- `setjump.mar' provides setjump and longjump which do not use $unwind
- utility on VMS.
- `ugsetjump.s' provides setjump and longjump which work on Ultrix VAX.
- `setjump.s' provides setjump and longjump for the Cray YMP.
-
- `Init5c2.scm' is Scheme initialization code.
- `Transcen.scm' has Scheme code for inexact builtin procedures.
- `Link.scm' has Scheme code for compiling and dynamic linking.
- `scmfig.h' is a C include file containing system dependent definitions.
- `patchlvl.h is the patchlevel of this release.
- `continue.c' code for continuations.
- `continue.h' data types and external functions for continuations.
- `setjump.h' is an include file dealing with continuations, stacks,
- and memory allocation.
- `scm.h' has the data type and external definitions of scm.
-
- `scm.c' has the top level and interrupt code.
- `findexec.c' has code to find the executable file.
- `time.c' has functions dealing with time.
- `repl.c' has error, read-eval-print loop, read, write and load code.
- `scl.c' has the code for utility functions which are not part of the
- IEEE Scheme spec or which are required for non-integer
- arithmetic.
- `eval.c' has the evaluator, apply, map, and foreach.
- `sys.c' has the code for opening and closing files, storage
- allocation and garbage collection.
- `rope.c' has C interface functions.
- `subr.c' has all the rest of functions.
- `sc2.c' has code for procedures from R2RS and R3RS not in R4RS.
- `dynl.c' has c code for dynamically loading object files.
- `unif.c' has code for uniform vectors.
- `rgx.c' has code for string regular expression match.
- `crs.c' has code for interactive terminal control.
- `split.scm' sets up CURSCM (SCM with crs.c) so that input, output,
- and diagnostic output are each directed to separate windows.
- `edline.c' Gnu readline input editing
- (get ftp.sys.toronto.edu:/pub/rc/editline.shar).
- `Iedline.scm' Gnu readline input editing.
- `record.c' has code for proposed "Record" user definable datatypes.
- `gsubr.c' has make_gsubr for arbitrary (< 11) arguments to C functions.
-
- `ioext.c' has code for system calls in common between PC compilers and unix.
- `posix.c' has code for posix library interface.
- `unix.c' has code for non-posix system calls on unix systems.
- `socket.c' has code for socket interface.
-
- SLIB
+specification. SCM runs under Amiga, Atari-ST, MacOS, MS-DOS, OS/2,
+NOS/VE, Unicos, VMS, Unix and similar systems.
+
+ `http://swissnet.ai.mit.edu/~jaffer/SCM.html'
+
+Manifest
+========
+
+`.gdbinit' provides commands for debugging SCM with GDB
+`COPYING' details the LACK OF WARRANTY for SCM and the conditions
+ for distributing SCM.
+`ChangeLog' changes to SCM.
+`Iedline.scm' Gnu readline input editing.
+`Init.scm' Scheme initialization.
+`Link.scm' compiles and dynamically links.
+`Macro.scm' Supports Syntax-Rules Macros.
+`Makefile' builds SCMLIT using the `make' program.
+`QUICKREF' Quick Reference card for R4RS and IEEE Scheme.
+`README' contains a MANIFEST, INSTALLATION INSTRUCTIONS, hints
+ for EDITING SCHEME CODE, and a TROUBLE SHOOTING GUIDE.
+`Transcen.scm' inexact builtin procedures.
+`bench.scm' computes and records performance statistics of pi.scm.
+`build.bat' invokes build.scm for MS-DOS
+`build.scm' database for compiling and linking new SCM programs.
+`continue.c' continuations.
+`continue.h' continuations.
+`crs.c' interactive terminal control.
+`dynl.c' dynamically load object files.
+`ecrt0.c' discover the start of initialized data space
+ dynamically at runtime.
+`edline.c' Gnu readline input editing (get
+ ftp.sys.toronto.edu:/pub/rc/editline.shar).
+`eval.c' evaluator, apply, map, and foreach.
+`example.scm' example from R4RS which uses inexact numbers.
+`findexec.c' find the executable file function.
+`gmalloc.c' Gnu malloc(); used for unexec.
+`gsubr.c' make_gsubr for arbitrary (< 11) arguments to C
+ functions.
+`ioext.c' system calls in common between PC compilers and unix.
+`mkimpcat.scm' build SCM-specific catalog for SLIB.
+`patchlvl.h' patchlevel of this release.
+`pi.c' computes digits of pi [cc -o pi pi.c;time pi 100 5].
+`pi.scm' computes digits of pi [type (pi 100 5)]. Test
+ performance against pi.c.
+`posix.c' posix library interface.
+`pre-crt0.c' loaded before crt0.o on machines which do not remap
+ part of the data space into text space in unexec.
+`r4rstest.scm' tests conformance with Scheme specifications.
+`ramap.c' array mapping
+`record.c' proposed `Record' user definable datatypes.
+`repl.c' error, read-eval-print loop, read, write and load.
+`rgx.c' string regular expression match.
+`rope.c' C interface functions.
+`sc2.c' procedures from R2RS and R3RS not in R4RS.
+`scl.c' inexact arithmetic
+`scm.1' unix style man page.
+`scm.c' initialization, interrupts, and non-IEEE utility
+ functions.
+`scm.doc' man page generated from scm.1.
+`scm.h' data type and external definitions of SCM.
+`scm.texi' SCM installation and use.
+`scmfig.h' contains system dependent definitions.
+`scmmain.c' initialization, interrupts, and non-IEEE utility
+ functions.
+`script.c' utilities for running as `#!' script.
+`setjump.h' continuations, stacks, and memory allocation.
+`setjump.mar' provides setjump and longjump which do not use $unwind
+ utility on VMS.
+`setjump.s' provides setjump and longjump for the Cray YMP.
+`socket.c' BSD socket interface.
+`split.scm' example use of crs.c. Input, output, and diagnostic
+ output directed to separate windows.
+`subr.c' the rest of IEEE functions.
+`sys.c' call-with-current-continuation, opening and closing
+ files, storage allocation and garbage collection.
+`time.c' functions dealing with time.
+`ugsetjump.s' provides setjump and longjump which work on Ultrix VAX.
+`unexalpha.c' Convert a running program into an Alpha executable file.
+`unexec.c' Convert a running program into an executable file.
+`unexelf.c' Convert a running ELF program into an executable file.
+`unexhp9k800.c' Convert a running HP-UX program into an executable file.
+`unexsgi.c' Convert a running program into an IRIX executable file.
+`unexsunos4.c' Convert a running program into an executable file.
+`unif.c' uniform vectors.
+`unix.c' non-posix system calls on unix systems.
+
+
+File: scm.info, Node: SLIB, Next: Building SCM, Prev: Making SCM, Up: Installing SCM
+
+SLIB
+====
[SLIB] is a portable Scheme library meant to provide compatibility and
utility functions for all standard Scheme implementations. Although
@@ -95,18 +98,19 @@ SLIB is not *neccessary* to run SCM, I strongly suggest you obtain and
install it. Bug reports about running SCM without SLIB have very low
priority. SLIB is available from the same sites as SCM:
- * swissnet.ai.mit.edu:pub/scm/slib2c3.tar.gz
- * prep.ai.mit.edu:pub/gnu/jacal/slib2c3.tar.gz
- * ftp.maths.tcd.ie:pub/bosullvn/jacal/slib2c3.tar.gz
- * ftp.cs.indiana.edu:/pub/scheme-repository/imp/slib2c3.tar.gz
+ * swissnet.ai.mit.edu:/pub/scm/slib2c7.tar.gz
-Unpack SLIB (`tar xzf slib2c3.tar.gz' or `unzip -ao slib2c3.zip') in an
+ * ftp.gnu.org:/pub/gnu/jacal/slib2c7.tar.gz
+
+ * ftp.cs.indiana.edu:/pub/scheme-repository/imp/slib2c7.tar.gz
+
+Unpack SLIB (`tar xzf slib2c7.tar.gz' or `unzip -ao slib2c7.zip') in an
appropriate directory for your system; both `tar' and `unzip' will
create the directory `slib'.
Then create a file `require.scm' in the SCM "implementation-vicinity"
-(this is the same directory as where the file `Init.scm' is installed).
-`require.scm' should have the contents:
+(this is the same directory as where the file `Init5d2.scm' is
+installed). `require.scm' should have the contents:
(define (library-vicinity) "/usr/local/lib/slib/")
(load (in-vicinity (library-vicinity) "require"))
@@ -128,16 +132,21 @@ Alternatively, you can set the (shell) environment variable
SCHEME_LIBRARY_PATH: SCM Variables.). If set, the environment variable
overrides `require.scm'. Again, absolute pathnames are recommended.
- MAKING SCM
+
+
+File: scm.info, Node: Making SCM, Next: SLIB, Prev: Installing SCM, Up: Installing SCM
+
+Making SCM
+==========
The SCM distribution has "Makefile" which contains rules for making
"scmlit", a "bare-bones" version of SCM sufficient for running
`build.scm'. `build.scm' is used to compile (or create scripts to
compile) full featured versions.
-Makefiles are not portable to the majority of platforms. If
-`Makefile' works for you, good; If not, I don't want to hear about it.
-If you need to compile SCM without build.scm, there are several ways to
+Makefiles are not portable to the majority of platforms. If `Makefile'
+works for you, good; If not, I don't want to hear about it. If you
+need to compile SCM without build.scm, there are several ways to
proceed:
* Use SCM on a different platform to run `build.scm' to create a
@@ -148,8 +157,8 @@ proceed:
* Create your own script or `Makefile'.
- * Buy a SCM executable from jaffer@ai.mit.edu. See the end of
- `ANNOUNCE' in the distribution for details.
+ * Buy a SCM executable from jaffer @ ai.mit.edu. See the end of the
+ `ANNOUNCE' file in the distribution for details.
* Use scmconfig (From: bos@scrg.cs.tcd.ie):
@@ -161,51 +170,31 @@ proceed:
I am moving it to the OLD subdirectory until someone submits an
update.
- Making SCM with Think C 4.0 or 4.1
-
-Note: These instructions need to be uptdated for scm5c3. If Think C
-can be called using system(), then SCM can be built using build.scm.
-
- Edit Scmfig.H to set desired options and IMPLINIT.
- from Yasuaki Honda // honda@csl.SONY.co.jp:
- Make a project and add source files repl.c, time.c, scm.c, subr.c,
- sys.c, eval.c, scl.c, sc2.c, and unif.c to it.
- Add libraries MacTraps, unix, ANSI to the project.
- The project should be segmented in the following way:
- ----------
- repl.c
- scm.c
- subr.c
- sys.c
- sc2.c
- unif.c
- time.c
- ----------
- MacTraps
- unix
- ----------
- ANSI
- ----------
- eval.c
- ----------
- scl.c
- ----------
- Choose 'Set Project Type' from 'Project' menu.
- Choose Application from radio buttons.
- Set Partition size to 600K. (The default 384K is not enough).
-
- EDITING SCHEME CODE
+
+
+File: scm.info, Node: Editing Scheme Code, Next: Debugging Scheme Code, Prev: SCM Session, Up: Operational Features
+
+Editing Scheme Code
+===================
+
+ - Function: ed ARG1 ...
+ The value of the environment variable `EDITOR' (or just `ed' if it
+ isn't defined) is invoked as a command with arguments ARG1 ....
+
+ - Function: ed FILENAME
+ If SCM is compiled under VMS `ed' will invoke the editor with a
+ single the single argument FILENAME.
Gnu Emacs:
Editing of Scheme code is supported by emacs. Buffers holding
files ending in .scm are automatically put into scheme-mode.
EMACS for MS-DOS and MS-Windows systems is available (free) from:
- * http://simtel.coast.net/SimTel/gnu/demacs.html
+ `http://simtel.coast.net/SimTel/gnu/demacs.html'
If your Emacs can run a process in a buffer you can use the Emacs
- command `M-x run-scheme' with SCM. Otherwise, use the emacs
- command `M-x suspend-emacs'; or see "other systems" below.
+command `M-x run-scheme' with SCM. Otherwise, use the emacs command
+`M-x suspend-emacs'; or see "other systems" below.
Epsilon (MS-DOS):
There is lisp (and scheme) mode available by use of the package
@@ -224,7 +213,7 @@ Epsilon (MS-DOS):
other systems:
Define the environment variable `EDITOR' to be the name of the
- editing program you use. The SCM procedure `(ed arg1 ...)' will
+ editing program you use. The SCM procedure `(ed arg1 ...)' will
invoke your editor and return to SCM when you exit the editor. The
following definition is convenient:
@@ -233,152 +222,159 @@ other systems:
Typing `(e)' will invoke the editor with the file of interest.
After editing, the modified file will be loaded.
- TROUBLE SHOOTING
-
-Reported problems and solutions are grouped under "Compiling",
-"Linking", "Running", and "Testing". If you don't find your problem
-listed here, you can send a bug report to <jaffer@ai.mit.edu>. The
-bug report should include:
-
- * The version of SCM (printed when SCM is invoked with no arguments).
-
- * The type of computer you are using.
-
- * The name and version of your computer's operating system.
-
- * The values of the environment variables SCM_INIT_PATH and
- SCHEME_LIBRARY_PATH.
-
- * The name and version of your C compiler.
-
- * If you are using an executable from a distribution, the name,
- vendor, and date of that distribution. In this case,
- corresponding with the vendor is recommended.
-
-
- Compiling:
-
-FILE ERROR or WARNING HOW TO FIX
-
-*.c include file not found Correct status of
- STDC_HEADERS
-
- fix #include statement
- or add #define for
- system type to scmfig.h
-
-scm.c assignment between incompatible types change SIGRETTYPE in scm.c
-
-time.c CLK_TCK redefined incompatablility
- between <stdlib.h> and
- <sys/types.h>. remove
- STDC_HEADERS in scmfig.h
-
- edit <sys/types.h> to
- remove incompatability.
-
-sys.c statement not reached ignore
- constant in conditional expression ignore
-
-sys.c: `???' undeclared, outside of functions #undef STDC_HEADERS
- in scmfig.h
-
-scl.c syntax error define system type in
- scmfig.h and scl.c (softtype)
-
- Linking:
-
-ERROR or WARNING HOW TO FIX
-
-_sin etc. missing. uncomment LIBS in makefile
-
- Running:
-
-PROBLEM HOW TO FIX
-
-Opening message and then machine Change memory model option
-crashes. to C compiler (or makefile).
-
- Make sure sizet definition is
- correct in scmfig.h
-
- Reduce size of HEAP_SEG_SIZE
- in setjump.h
-
-Input hangs #define NOSETBUF
-
-ERROR: heap: need larger initial Need to increase the initial
- heap allocation using
- -a<kbytes> or INIT_HEAP_SIZE.
-
-ERROR: Could not allocate ... Check sizet definition.
-
- Get more memory.
-
- Don't try to run as subproccess
-
-... in scmfig.h and recompile scm Do it and recompile files.
-
-ERROR: Init.scm not found Assign correct IMPLINIT in
- makefile or scmfig.h or
- define environment variable
- SCM_INIT_PATH to be the full
- pathname of Init.scm (see
- INSTALLATION instructions).
-
-WARNING: require.scm not found define environment variable
- SCHEME_LIBRARY_PATH to be the
- full pathname of the scheme
- library SLIB or change
- library-vicinity in Init.scm
- to point to library or remove.
- See section SLIB above.
-
- Make sure library-vicinity has
- a trailing file separator
- (like / or \).
-
- Testing: (load "r4rstest.scm") or (load "pi.scm") (pi 100 5)
-
-Runs some and then machine crashes. See above under machine
- crashes.
-
-Runs some and then ERROR: ... Remove optimization option
-(after a GC has happened) to C compiler and recompile.
-
- #define SHORT_ALIGN in scmfig.h
-
-Some symbol names print incorrectly. Change memory model option
- to C compiler (or makefile).
-
- Check that HEAP_SEG_SIZE fits
- within sizet.
-
- Increase size of HEAP_SEG_SIZE
- (or INIT_HEAP_SIZE if it is
- smaller than HEAP_SEG_SIZE).
-
-ERROR: Rogue pointer in Heap. See above under machine
- crashes.
-
-Newlines don't appear correctly in Check file mode (define OPEN_...
-output files. in Init.scm
-
-Spaces or control characters appear Check character defines in
-in symbol names scmfig.h
-
-Negative numbers turn positive. Check SRS in scmfig.h
-VMS: Couldn't unwind stack #define CHEAP_CONTIUATIONS
-VAX: botched longjmp in scmfig.h
-Sparc(SUN-4) heap is growing out of control:
+File: scm.info, Node: Problems Compiling, Next: Problems Linking, Prev: Automatic C Preprocessor Definitions, Up: Installing SCM
+
+Problems Compiling
+==================
+
+FILE PROBLEM / MESSAGE HOW TO FIX
+*.c include file not found. Correct the status of
+ STDC_HEADERS in scmfig.h.
+ fix #include statement or add
+ #define for system type to
+ scmfig.h.
+*.c Function should return a value. Ignore.
+ Parameter is never used.
+ Condition is always false.
+ Unreachable code in function.
+scm.c assignment between incompatible Change SIGRETTYPE in scm.c.
+ types.
+time.c CLK_TCK redefined. incompatablility between
+ <stdlib.h> and <sys/types.h>.
+ Remove STDC_HEADERS in scmfig.h.
+ Edit <sys/types.h> to remove
+ incompatability.
+subr.c Possibly incorrect assignment Ignore.
+ in function lgcd.
+sys.c statement not reached. Ignore.
+ constant in conditional
+ expression.
+sys.c undeclared, outside of #undef STDC_HEADERS in scmfig.h.
+ functions.
+scl.c syntax error. #define SYSTNAME to your system
+ type in scl.c (softtype).
+
+
+
+File: scm.info, Node: Problems Linking, Next: Problems Running, Prev: Problems Compiling, Up: Installing SCM
+
+Problems Linking
+================
+
+PROBLEM HOW TO FIX
+_sin etc. missing. Uncomment LIBS in makefile.
+
+
+
+File: scm.info, Node: Problems Running, Next: Testing, Prev: Problems Linking, Up: Installing SCM
+
+Problems Running
+================
+
+PROBLEM HOW TO FIX
+Opening message and then machine Change memory model option to C
+crashes. compiler (or makefile).
+ Make sure sizet definition is
+ correct in scmfig.h.
+ Reduce the size of HEAP_SEG_SIZE in
+ setjump.h.
+Input hangs. #define NOSETBUF
+ERROR: heap: need larger initial. Increase initial heap allocation
+ using -a<kb> or INIT_HEAP_SIZE.
+ERROR: Could not allocate. Check sizet definition.
+ Use 32 bit compiler mode.
+ Don't try to run as subproccess.
+remove <FLAG> in scmfig.h and Do so and recompile files.
+recompile scm.
+add <FLAG> in scmfig.h and
+recompile scm.
+ERROR: Init5d2.scm not found. Assign correct IMPLINIT in makefile
+ or scmfig.h.
+ Define environment variable
+ SCM_INIT_PATH to be the full
+ pathname of Init5d2.scm.
+WARNING: require.scm not found. Define environment variable
+ SCHEME_LIBRARY_PATH to be the full
+ pathname of the scheme library
+ [SLIB].
+ Change library-vicinity in
+ Init5d2.scm to point to library or
+ remove.
+ Make sure the value of
+ (library-vicinity) has a trailing
+ file separator (like / or \).
+
+
+
+File: scm.info, Node: Testing, Next: Reporting Problems, Prev: Problems Running, Up: Installing SCM
+
+Testing
+=======
+
+Loading `r4rstest.scm' in the distribution will run an [R4RS]
+conformance test on `scm'.
+
+ > (load "r4rstest.scm")
+ -|
+ ;loading "r4rstest.scm"
+ SECTION(2 1)
+ SECTION(3 4)
+ #<primitive-procedure boolean?>
+ #<primitive-procedure char?>
+ #<primitive-procedure null?>
+ #<primitive-procedure number?>
+ ...
+
+Loading `pi.scm' in the distribution will enable you to compute digits
+of pi.
+
+ > (load "pi")
+ ;loading "pi"
+ ;done loading "pi.scm"
+ ;Evaluation took 20 mSec (0 in gc) 767 cells work, 233 bytes other
+ #<unspecified>
+ > (pi 100 5)
+ 00003 14159 26535 89793 23846 26433 83279 50288 41971 69399
+ 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211
+ 70679
+ ;Evaluation took 550 mSec (60 in gc) 36976 cells work, 1548 bytes other
+ #<unspecified>
+
+Loading `bench.scm' will compute and display performance statistics of
+SCM running `pi.scm'. `make bench' or `make benchlit' appends the
+performance report to the file `BenchLog', facilitating tracking
+effects of changes to SCM on performance.
+
+PROBLEM HOW TO FIX
+Runs some and then machine crashes. See above under machine crashes.
+Runs some and then ERROR: ... Remove optimization option to C
+(after a GC has happened). compiler and recompile.
+ #define SHORT_ALIGN in `scmfig.h'.
+Some symbol names print incorrectly. Change memory model option to C
+ compiler (or makefile).
+ Check that HEAP_SEG_SIZE fits
+ within sizet.
+ Increase size of HEAP_SEG_SIZE (or
+ INIT_HEAP_SIZE if it is smaller
+ than HEAP_SEG_SIZE).
+ERROR: Rogue pointer in Heap. See above under machine crashes.
+Newlines don't appear correctly in Check file mode (define OPEN_... in
+output files. `Init5d2.scm').
+Spaces or control characters appear Check character defines in
+in symbol names. `scmfig.h'.
+Negative numbers turn positive. Check SRS in `scmfig.h'.
+VMS: Couldn't unwind stack. #define CHEAP_CONTIUATIONS in
+ `scmfig.h'.
+VAX: botched longjmp.
+
+Sparc(SUN-4) heap is growing out of control
+ You are experiencing a GC problem peculiar to the Sparc. The
+ problem is that SCM doesn't know how to clear register windows.
+ Every location which is not reused still gets marked at GC time.
+ This causes lots of stuff which should be collected to not be.
+ This will be a problem with any *conservative* GC until we find
+ what instruction will clear the register windows. This problem is
+ exacerbated by using lots of call-with-current-continuations.
- You are experiencing a GC problem peculiar to the Sparc. The
- problem is that SCM doesn't know how to clear register
- windows. Every location which is not reused still gets marked
- at GC time. This causes lots of stuff which should be
- collected to not be. This will be a problem with any
- "conservative" GC until we find what instruction will clear
- the register windows. This problem is exacerbated by using
- lots of call-with-current-continuations.