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Whalesong: Racket to JavaScript compiler

Home Page: http://hashcollision.org/whalesong

Racket 63.18% Makefile 0.03% HTML 1.30% CSS 0.02% JavaScript 35.37% C 0.01% Shell 0.03% Scheme 0.06%

whalesong's Introduction

Whalesong

Important

Whalesong needs Racket 6.2. As is Whalesong doesn't work on version 6.3 or greater. See #48

Installation

raco pkg install -j 1 --force --deps search-auto --scope installation whalesong

Important: Use -j 1 to build Whalesong (this turns off parallel builds) This also means, that you can't install Whalesong from the DrRacket package manager.

This fork of Whalesong differs from dyoo/whalesong in the following ways:

Builds on version 6.2 of Racket (fixes the x undefined problem)
Adds for (require whalesong/lang/for)
Adds match (require whalesong/lang/match)
Adds on-release (as a complement to on-key) Contributed by Darren Cruse
Adds parameters (require whalesong/lang/parameters)
Extended whalesong/image and whalesong/images (more functions, bug fixes, now matches WeScheme) Contributed by Emmanuel Schanzer
Adds play-sound (assumes a browser with html5 audio support) Contributed by Emmanuel Schanzer and Darren Cruse
Bug fixes by Vishesh Yadav
The flag --as-standalone-xhtml is now --as-standalone-html and produces standalone html rather than xhtml.

Note: The implementation of parameters works fine, as long as you don't mix parameterize with non-local-exits and reentries (i.e. call/cc and friends)

/soegaard

whalesong's People

Contributors

Stargazers

Watchers

Forkers

helioh2 darrencruse schanzer vishesh stchang stamourv qyqx tim-brown suzannesoy kuemmel rowhit linkitools lebastr zaxebo1

whalesong's Issues

Version Compatibility in Readme

Today I decided I want to try out Whalesong. First I tried installing as shown on the documentation page, but that only caused many errors and failed. Then I searched GitHub for issues regarding those errors, finally finding a link to this repository. Then I read the note in the Readme file telling me it depended on Racket 6.2:

Important

Whalesong needs Racket 6.2. As is Whalesong doesn't work on version 6.3 or greater. See #48

So I thought "Ah too bad, I'd have really liked to try it.", but then I read something contradictory in the same readme:

This fork of Whalesong differs from dyoo/whalesong in the following ways:

Builds on latest release of Racket (fixes the x undefined problem)

So which one is it? 6.2 or the latest version? Or does this only mean, that the library was created using Racket 6.8, but to use it you need to use 6.2?

I think this could be made a bit clearer in the readme.

I don't really know what differences in language and performance there are from Racket 6.2 to 6.8. Considering the timespan Racket is version 6.8 and the frequency of people working on it, I'd guess the differences in performance could be quite big, while I'd guess the language for the user was probably already quite stable. Depending on an older version "so many versions ago" makes me feel unsure about using Whalesong. Maybe I'll want to have other libraries for a project, but then I am stuck with Racket 6.2 and cannot use those other libraries. Such and similar issues come to mind, which is why it is really important to clarify what exactly the situation with the version dependency is.

place-image/align function produces wrong output and sometimes crash

This piece of code will produce different output in DrRacket and Whalesong

(place-image/align (circle 20 "solid" "red")
-10 -10 "left" "top"
(empty-scene 100 100))

I found a crash occurring while trying to port flappy birds due to place-image/align. Yet to figure out why. http://bigbang.ccs.neu.edu/get/STtuE

does not support capital letter input (and other shift key characters)

See vishesh/whalebin#16

Install errors with new macro expander

Whalesong does not install properly with the latest version of Racket (6.2.900.10), presumably due to changes in the bytecode

Here's some of the errors:

raco setup: --- summary of errors ---
raco setup: error: during making for <pkgs>/whalesong/whalesong (Whalesong)
raco setup:   plt/racket/share/pkgs/whalesong/whalesong/lang/private/qq-and-or.rkt:108:118: idl: unbound identifier in module (in phase 1, transformer environment)
raco setup:     in: idl
raco setup:     compiling: <pkgs>/whalesong/whalesong/lang/private/qq-and-or.rkt
raco setup: error: during making for <pkgs>/whalesong/whalesong/bf
raco setup:   plt/racket/share/pkgs/whalesong/whalesong/lang/private/qq-and-or.rkt:108:118: idl: unbound identifier in module (in phase 1, transformer environment)
raco setup:     in: idl
raco setup:     compiling: <pkgs>/whalesong/whalesong/lang/private/qq-and-or.rkt
raco setup: error: during making for <pkgs>/whalesong/whalesong/compiler
raco setup:   plt/racket/share/pkgs/whalesong/whalesong/parser/parse-bytecode-5.3.3.7.rkt:187:23: match: wrong number for fields for structure prefix: expected 4 but got 3
raco setup:     at: (num-lifts toplevels stxs)
raco setup:     in: (struct prefix (num-lifts toplevels stxs))
raco setup:     compiling: <pkgs>/whalesong/whalesong/parser/parse-bytecode-5.3.3.7.rkt

Implement pinholes and related functions in whalesong/image

http://docs.racket-lang.org/teachpack/2htdpimage.html#%28part._pinholes%29

The #:reflection-name struct option causes a runtime error

Trying to declare a struct with the #:reflection-name option causes an error in the runtime:

(struct foo () #:reflection-name 'bar)

TypeError: Cannot read property 'prefix' of undefined
    at _400 [as p] (file:///tmp/dist/struct_1.js:104:262)
    at _448 (file:///tmp/dist/struct_1.js:215:12)
    at Machine._trampoline (file:///tmp/dist/struct.js:13640:17)
    at null.<anonymous> (file:///tmp/dist/struct.js:13691:38)
    at ExclusiveLock.acquire (file:///tmp/dist/struct.js:13216:23)
    at restart (file:///tmp/dist/struct.js:13686:35)
    at file:///tmp/dist/struct_1.js:231:50
    at Object.currentModuleLoader (file:///tmp/dist/struct.js:14296:24)
    at null.onPause (file:///tmp/dist/struct_1.js:228:26)
    at Machine._trampoline (file:///tmp/dist/struct.js:13719:23)

support racket/draw

Requested by Matthias.

This is a large task. Recording it here in case someone is interested in contributing and wants a research-level project.

Replace letrec and letrec-values in kernel.rkt

The latest Racket compiles the racket letrec and letrec-values into bytecode that checks for access to uninitialized values via check-for-unsafe-undefined. The easiest solution to fix Whalesong is to add these definitions of letrec and letrec-values to kernel.rkt.

(define-syntax (letrec stx)
(syntax-parse stx
[(_ ([id expr] ...) body ...)
(syntax/loc stx
(let ([id 'undefined] ...)
(set! id expr) ...
(let () body ...)))]))

(define-syntax (letrec-values stx)
(syntax-parse stx
[(_ ([(id ...) expr] ...) body ...)
(syntax/loc stx
(let ([id 'undefined] ... ...)
(set!-values (id ...) expr) ...
(let () body ...)))]))

place-image functions doesn't work

place-image and related function don't work. For example the image-library-example.rkt in examples fails.

Tracing the problem, I figured in kernel.js:makeSceneImage function the value of children before calling SceneImage constructor and inside SceneImage constructor are different. I'm compiling on Racket 6.1.1 on Linux and testing on latest Chrome and Firefox browser.

thanks.

support on-draw

on-draw is the same as to-draw.

on-draw is deprecated in Racket but it's not very clearly stated in the docs so lots of programs still use it. Whalesong should include it to be compatible with 2htdp/universe.

FYI raco setup errors reported

raco setup errors reported

raco setup: package declares no dependencies: "whalesong"
raco setup: --- summary of errors ---
raco setup: error: during making for /dyoo/whalesong.plt/1/21 (Whalesong)
raco setup: ...nomad/Library/Racket/planet/300/6.2.1/cache/dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt:372:20: match: wrong number for fields for structure mod: expected 16 but got 15
raco setup: at: (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules)
raco setup: in: (struct mod (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules))
raco setup: compiling: /dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt
raco setup: error: during making for /dyoo/whalesong.plt/1/21/compiler
raco setup: ...nomad/Library/Racket/planet/300/6.2.1/cache/dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt:372:20: match: wrong number for fields for structure mod: expected 16 but got 15
raco setup: at: (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules)
raco setup: in: (struct mod (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules))
raco setup: compiling: /dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt
raco setup: error: during making for /dyoo/whalesong.plt/1/21/js-assembler
raco setup: ...nomad/Library/Racket/planet/300/6.2.1/cache/dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt:372:20: match: wrong number for fields for structure mod: expected 16 but got 15
raco setup: at: (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules)
raco setup: in: (struct mod (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules))
raco setup: compiling: /dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt
raco setup: error: during making for /dyoo/whalesong.plt/1/21/make
raco setup: ...nomad/Library/Racket/planet/300/6.2.1/cache/dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt:372:20: match: wrong number for fields for structure mod: expected 16 but got 15
raco setup: at: (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules)
raco setup: in: (struct mod (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules))
raco setup: compiling: /dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt
raco setup: error: during making for /dyoo/whalesong.plt/1/21/parser
raco setup: ...nomad/Library/Racket/planet/300/6.2.1/cache/dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt:372:20: match: wrong number for fields for structure mod: expected 16 but got 15
raco setup: at: (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules)
raco setup: in: (struct mod (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules))
raco setup: compiling: /dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt

empty-scene is a stub

lang whalesong

(require whalesong/world)
(require whalesong/image)
(empty-scene)

Produces the error:
empty-scene: stub definition

Should I use something else?

Inconsistency between README and ticket about version support

In this ticket, @soegaard said that "... we are stuck with Racket 6.2." And the ticket itself is named "Compiling failed in Racket 6.3". However, the README file of this project says: "Whalesong needs Racket 5.2. As is Whalesong doesn't work on version 5.3 or greater." It appears that there is an inconsistency here in the specification of which versions are not supported. I'm not sure whether this was a simple mistake or if I'm missing something here.

implement stop-with

In particular, Realm of Racket examples need this construct.

round does not use the Banker's convention

In Racket (round 0.5) gives 0 (due to the round-to-even rule).
In Whalesong the result is 1.

Fix define-resource in compile-time.rkt

In "compile-time.rkt" the body of define-resource is changed to

         ;; Run time code
         #;(define name (specialize! (resource normal-path munged-path content)))
         (define name (resource normal-path munged-path content))

This fixed a runtime error that occurs when define-resource is used.
It seems that the problem is related to checkargument and structures.

Here is an example of the error from http://lists.racket-lang.org/users/archive/2013-December/060683.html

Error: specialize!: expected resource as argument 1 but received
(resource #path:C:working-copieswhalesongtimer.png "timer.png"

What's interesting is that checkargument says it expects a resource structure,
even though it got one.

Compiling whalesong

Hello, I'm having an issue with compiling Whalesong. Let me start by saying that I tried to install the dyoo/whalesong version from the planet repository but to no avail. I actually end up getting the same error either way.

My problem right now is that when I run sudo make, I get this output:

raco planet link dyoo whalesong.plt 1 19 .
racket make-launcher.rkt
copy-file: cannot open source file
source path: /home/alberto/racket/collects/launcher/sh
destination path: /home/alberto/whalesong-master/whalesong/whalesong
system error: No such file or directory; errno=2
make: *** [launcher] Error 1

Neither the source nor destination exists. In fact, I'm not sure why the destination is as such, since that's too many levels deep (the make file is in /home/alberto/whalesong-master/whalesong).

I appreciate any help you can provide.

port dependent planet packages to new pkg server?

Whalesong still uses many of Danny's libraries from the old package server. Would it be worthwhile to move these to the new pkg server?

.racket/6.8/pkgs/whalesong/whalesong/lang/private/qq-and-or.rkt:108:118: idl: unbound identifier in module (in phase 1, transformer environment) in: idl

.racket/6.8/pkgs/whalesong/whalesong/lang/private/qq-and-or.rkt:108:118: idl: unbound identifier in module (in phase 1, transformer environment) in: idl

m

whalesong/image transparency doesn't work

Alpha values in colors are ignored. Eg. (rectangle 200 200 "solid" (make-color 255 0 0 100))

define-syntax-rule ellipsis pattern doesnt match single item

#lang whalesong
(define-syntax-rule (my-define (f x ...) e) (define (f x ...) e))
(my-define (g x) x)

=>
my-define: use does not match pattern: (my-define (f x ...) e) in: (my-define (g x) x)

test suite test-assemble.rkt failing

Running (E-many (list (make-PushEnvironment 2 #f)) "M.e.length") ...
#(struct:exn:fail:contract:arity assemble/write-invoke: arity mismatch;
 the expected number of arguments does not match the given number
  expected: 3
  given: 2
  arguments...:
   (list (PushEnvironment 2 #f))
   #<output-port:string> #<continuation-mark-set>)
. test: Runtime error: got #(struct:error-happened "assemble/write-invoke: arity mismatch;\n the expected number of arguments does not match the given number\n  expected: 3\n  given: 2\n  arguments...:\n   (list (PushEnvironment 2 #f))\n   #<output-port:string>" #<continuation-mark-set> 1) in: (test (E-many (list (make-PushEnvironment 2 #f)) "M.e.length") "2")

`rotate` doesn't allow negative angles

rotate from whalesong/image is currently incompatible with rotate from 2htdp/image. It should accept any real number: http://docs.racket-lang.org/teachpack/2htdpimage.html?q=rotate#%28def._%28%28lib._2htdp%2Fimage..rkt%29._angle~3f%29%29

Compiling failed in Racket 6.3

whalesong/lang/private/qq-and-or.rkt:108:118: idl: unbound identifier in module (in phase 1, transformer environment)
whalesong/parser/parse-bytecode-5.3.3.7.rkt:100:50: match: wrong number for fields for structure compilation-top: expected 4 but got 3

Compile as standalone xhtml broken

Currently complains about contract violation in build-path used here[1]. Fixing that finishes the compile process, however the generated output doesn't run throwing up following error on JS console.

Uncaught SyntaxError: Failed to set the 'innerHTML' property on 'Element': The provided markup is invalid XML, and therefore cannot be inserted into an XML document.

[1] https://github.com/vishesh/whalesong/blob/master/whalesong/whalesong-helpers.rkt#L133

Remove simulator based tests

Simulator seems to be removed from codebase. Commit 0de37fa talks about cleanup. Tests using it still strays in codebase.

(equal? 13 13.0)

lang whalesong

(equal? 13 13)
(equal? 13. 13)
(equal? 13 13.)
(equal? 13. 13.)

gives

true
false
false
true

2048 doesn't work in Firefox

I tried this program: http://bigbang.ccs.neu.edu/get/GowoK

Instead of the game, I got this error output:

makePrimitiveProcedure/impl@http://bigbang.ccs.neu.edu/get-full/GowoK:8643:19
_16762@http://bigbang.ccs.neu.edu/get-full/GowoK:20322:9
_18254@http://bigbang.ccs.neu.edu/get-full/GowoK:34367:8
_18335@http://bigbang.ccs.neu.edu/get-full/GowoK:34336:9
_18254@http://bigbang.ccs.neu.edu/get-full/GowoK:34362:24
_18255@http://bigbang.ccs.neu.edu/get-full/GowoK:34318:9
_16739@http://bigbang.ccs.neu.edu/get-full/GowoK:20397:9
_19577@http://bigbang.ccs.neu.edu/get-full/GowoK:38584:8
makePrimitiveProcedure/impl@http://bigbang.ccs.neu.edu/get-full/GowoK:8645:20
_19570@http://bigbang.ccs.neu.edu/get-full/GowoK:38597:9
makePrimitiveProcedure/impl@http://bigbang.ccs.neu.edu/get-full/GowoK:8645:20
_19289@http://bigbang.ccs.neu.edu/get-full/GowoK:41308:9
_19292@http://bigbang.ccs.neu.edu/get-full/GowoK:42369:9
_19291@http://bigbang.ccs.neu.edu/get-full/GowoK:41065:8
_15425@http://bigbang.ccs.neu.edu/get-full/GowoK:26132:9
_16756@http://bigbang.ccs.neu.edu/get-full/GowoK:20350:9
_18254@http://bigbang.ccs.neu.edu/get-full/GowoK:34367:8
_18335@http://bigbang.ccs.neu.edu/get-full/GowoK:34336:9
_18254@http://bigbang.ccs.neu.edu/get-full/GowoK:34362:24
_18255@http://bigbang.ccs.neu.edu/get-full/GowoK:34318:9
_16739@http://bigbang.ccs.neu.edu/get-full/GowoK:20397:9
_19577@http://bigbang.ccs.neu.edu/get-full/GowoK:38584:8
makePrimitiveProcedure/impl@http://bigbang.ccs.neu.edu/get-full/GowoK:8645:20
_19570@http://bigbang.ccs.neu.edu/get-full/GowoK:38597:9
makePrimitiveProcedure/impl@http://bigbang.ccs.neu.edu/get-full/GowoK:8645:20
_19289@http://bigbang.ccs.neu.edu/get-full/GowoK:41308:9
_19292@http://bigbang.ccs.neu.edu/get-full/GowoK:42369:9
_19291@http://bigbang.ccs.neu.edu/get-full/GowoK:41065:8
_15425@http://bigbang.ccs.neu.edu/get-full/GowoK:26132:9
_16758@http://bigbang.ccs.neu.edu/get-full/GowoK:20329:9
_15427@http://bigbang.ccs.neu.edu/get-full/GowoK:26072:8
_15428@http://bigbang.ccs.neu.edu/get-full/GowoK:26012:9
_16822@http://bigbang.ccs.neu.edu/get-full/GowoK:20107:9
_16729@http://bigbang.ccs.neu.edu/get-full/GowoK:20443:8
_16731@http://bigbang.ccs.neu.edu/get-full/GowoK:20435:8
_15423@http://bigbang.ccs.neu.edu/get-full/GowoK:26190:8
_16816@http://bigbang.ccs.neu.edu/get-full/GowoK:20178:9
_15431@http://bigbang.ccs.neu.edu/get-full/GowoK:25928:8
_16840@http://bigbang.ccs.neu.edu/get-full/GowoK:25854:9
_16842@http://bigbang.ccs.neu.edu/get-full/GowoK:25871:8
_16850@http://bigbang.ccs.neu.edu/get-full/GowoK:20049:8
_16848@http://bigbang.ccs.neu.edu/get-full/GowoK:20062:8
_16844@http://bigbang.ccs.neu.edu/get-full/GowoK:20075:8
_16837@http://bigbang.ccs.neu.edu/get-full/GowoK:20091:8
_15432@http://bigbang.ccs.neu.edu/get-full/GowoK:25902:8
_16884@http://bigbang.ccs.neu.edu/get-full/GowoK:19975:9
makePrimitiveProcedure/impl@http://bigbang.ccs.neu.edu/get-full/GowoK:8645:20
_16868@http://bigbang.ccs.neu.edu/get-full/GowoK:25764:9
_16870@http://bigbang.ccs.neu.edu/get-full/GowoK:25781:8
_16878@http://bigbang.ccs.neu.edu/get-full/GowoK:19981:8
_16876@http://bigbang.ccs.neu.edu/get-full/GowoK:19994:8
_16872@http://bigbang.ccs.neu.edu/get-full/GowoK:20007:8
_16862@http://bigbang.ccs.neu.edu/get-full/GowoK:25812:8
_16865@http://bigbang.ccs.neu.edu/get-full/GowoK:20010:24
_15433@http://bigbang.ccs.neu.edu/get-full/GowoK:25833:8
_17979@http://bigbang.ccs.neu.edu/get-full/GowoK:16627:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33494:8
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
_18279@http://bigbang.ccs.neu.edu/get-full/GowoK:33490:24
_18449@http://bigbang.ccs.neu.edu/get-full/GowoK:33482:9
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ExclusiveLock.prototype.acquire@http://bigbang.ccs.neu.edu/get-full/GowoK:13225:13
ModuleRecord.prototype._invoke@http://bigbang.ccs.neu.edu/get-full/GowoK:8804:1
ModuleRecord.prototype.invoke@http://bigbang.ccs.neu.edu/get-full/GowoK:8769:9
Machine.prototype.loadAndInvoke/<@http://bigbang.ccs.neu.edu/get-full/GowoK:13368:1
defaultModuleLoader@http://bigbang.ccs.neu.edu/get-full/GowoK:14289:20
Machine.prototype.loadAndInvoke@http://bigbang.ccs.neu.edu/get-full/GowoK:13363:1
invokeMains/</loop@http://bigbang.ccs.neu.edu/get-full/GowoK:13915:21

big-bang doesn't clear up canvas on each tick

For example mouse.rkt in examples. Rendering in each each tick is done over previous tick canvas. Any ideas @schanzer?

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