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Anish Athalye c07e9cde09 Improve errors for forbidden ops on weak sets 
Forbidden set operations on weak sets produced slightly confusing error
messages:

    > (define s (weak-set))
    > (set-add s 42)
    ; set-add:
    ; expected: (not/c set-mutable?)
    ; given mutable set: (weak-set)
    ; argument position: 1st
    > (set-mutable? s)
    #f

Invoking an operation that required an immutable set gave a message
saying that a `(not/c set-mutable?)` was expected, but a `weak-set` is
not recognized by `set-mutable?`, which only recognizes mutable sets
with strongly-held keys. Changing `set-mutable?` to recognize weak sets
seems undesirable.

This patch changes the error message so that the above example produces
the following error:

    > (define s (weak-set))
    > (set-add s 42)
    ; set-add:
    ; expected: (not/c (or/c set-mutable? set-weak?))
    ; given mutable set: (weak-set)
    ; argument position: 1st
2021-02-11 12:41:46 -05:00
.github ci: build CS for iOS during PR CI 2021-01-19 07:08:27 -05:00
pkgs Chez Schme: change struct predicate implementation 2021-02-10 06:53:53 -07:00
racket Improve errors for forbidden ops on weak sets 2021-02-11 12:41:46 -05:00
.gitattributes Don't include git files in archives. 2010-05-12 01:46:05 -04:00
.gitignore Fix typo. 2019-06-21 12:32:37 -05:00
.lgtm.yml Fetch PB to start LGTM build 2020-08-07 12:17:17 +02:00
.mailmap Minor metadata changes. 2019-10-15 08:09:32 -04:00
.makefile Chez Schme: change struct predicate implementation 2021-02-10 06:53:53 -07:00
build.md build-instruction typos and clarifications 2020-12-27 19:08:19 -07:00
LICENSE update LICENSE to use "CS" and "BC" 2021-01-15 09:32:59 -07:00
Makefile Chez Schme: change struct predicate implementation 2021-02-10 06:53:53 -07:00
README.md Fix README 2020-09-06 09:03:42 -04:00

README.md

Racket is a general-purpose programming language and an ecosystem for language-oriented programming.

This repository holds the source code for the core of Racket plus some related packages. The rest of the Racket distribution source code is in other repositories, mostly under the Racket GitHub organization.

Quick Start

Pre-built versions of Racket for a variety of operating systems and architectures, as well as convenient source distributions are available at

https://download.racket-lang.org

Racket comes with extensive documentation, including several tutorials. You can read all of this documentation, as well as documentation for third-party packages at

https://docs.racket-lang.org

Building from Source

For information on building Racket from this repository, see the Build Guide.

Contributing

Contribute to Racket by submitting a pull request, joining the development mailing list, or visiting the IRC or Slack channels.

By making a contribution, you are agreeing that your contribution is licensed under the LGPLv3, Apache 2.0, and MIT licenses. Those licenses are available in this repository in the files racket/src/LICENSE-LGPL.txt, racket/src/LICENSE-APACHE.txt, and racket/src/LICENSE-MIT.txt.

See the Racket Build Guide for more guidance on contributing.

The Friendly Environment Policy contains guidelines on expected behavior within the Racket community.

License

Racket is free software; see LICENSE for more details.