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864c832971 Lambdas (#3848 )

This document proposes a path forward to add lambdas to Carbon. It
further proposes augmenting function declarations to create a more
continuous syntax between the two categories of functions. In short,
both lambdas and function declarations will be introduced with the `fn`
keyword. The presence of a name distinguishes a function declaration
from a lambda expression, and the rest of the syntax applies to both
kinds. By providing a valid lambda syntax in Carbon, migration from from
C++ to Carbon will be made easier and more idiomatic. In C++, lambdas
are defined at their point of use and are often anonymous, meaning
replacing them solely with function declarations would create an
ergonomic burden compounded by the need for the migration tool to select
a name.

Associated discussion docs:

* [Lambdas Discussion
1](https://docs.google.com/document/d/1rZ9SXL4Voa3z20EQz4UgBMOZg8xc8xzKqA1ufPQdTao/)
* [Lambdas Discussion
2](https://docs.google.com/document/d/14K_YLjChWyyNv3wv5Mn7uLFHa0JZTc21v_WP8RzC8M4/)
* [Lambdas Discussion
3](https://docs.google.com/document/d/1VVOlRuPGt8GQpjsygMwH2B7Wd0mBsS3Qif8Ve2yhX_A/)
* [Lambdas Discussion
4](https://docs.google.com/document/d/1Sevhvjo06Bc6wTigNL1pK-mlF3IXvzmU1lI2X1W9OYA/)

---------

Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
Co-authored-by: Richard Smith <richard@metafoo.co.uk>

2024-09-20 02:08:59 +00:00

p0555

Update pre-commit (#3952 )

2024-05-16 23:23:41 +00:00

p0818

Update links to open discussion minutes archives (#1873 )

2022-08-01 16:46:19 -07:00

scripts

Start adapting to bzlmod configurations. (#3505 )

2023-12-15 01:05:35 +00:00

__init__.py

Move the jekyll sidebar to a python script for consistent generation. (#205 )

2020-12-04 08:26:25 -08:00

p0024.md

Generics goals (#24 )

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p0029.md

Typo fixes in proposals (#1965 )

2022-08-11 12:06:51 -07:00

p0042.md

Spelling (#1580 )

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p0044.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

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Spelling (#1580 )

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p0063.md

Merge rationale and open question answers into proposals (#461 )

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p0074.md

Merge rationale and open question answers into proposals (#461 )

2021-04-14 15:23:25 -07:00

p0083.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p0107.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

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p0120.md

Merge rationale and open question answers into proposals (#461 )

2021-04-14 15:23:25 -07:00

p0140.md

fix some typos (#1444 )

2022-07-20 07:01:47 +03:00

p0142.md

Spelling (#1580 )

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p0143.md

Merge rationale and open question answers into proposals (#461 )

2021-04-14 15:23:25 -07:00

p0144.md

Remove proposals dir special casing (#1170 )

2022-04-07 10:34:00 -07:00

p0149.md

Fixed typo (#1473 )

2022-07-20 14:55:54 -04:00

p0157.md

Switch proposal link text from pNNNN to #NN for consistency (#2202 )

2022-09-21 10:37:07 -07:00

p0162.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

p0175.md

Auto-update pre-commit repositories and fix. (#3427 )

2023-11-28 17:17:28 +00:00

p0179.md

Remove proposals dir special casing (#1170 )

2022-04-07 10:34:00 -07:00

p0196.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

p0198.md

Merge rationale and open question answers into proposals (#461 )

2021-04-14 15:23:25 -07:00

p0199.md

Spelling (#1580 )

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p0253.md

Merge rationale and open question answers into proposals (#461 )

2021-04-14 15:23:25 -07:00

p0257.md

C/C++ -> C and C++ (#2340 )

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p0285.md

C/C++ -> C and C++ (#2340 )

2022-10-25 12:06:24 -07:00

p0301.md

Principle: Errors are values (#301 )

2021-04-21 13:00:03 -07:00

p0339.md

chore: fix typos (#3738 )

2024-03-04 16:27:31 +00:00

p0340.md

C/C++ -> C and C++ (#2340 )

2022-10-25 12:06:24 -07:00

p0353.md

C/C++ -> C and C++ (#2340 )

2022-10-25 12:06:24 -07:00

p0415.md

Add pre-commit check to remove trunk links from md files (#847 )

2021-09-23 09:05:21 -07:00

p0426.md

Governance & evolution revamp (#426 )

2021-04-13 20:57:17 -07:00

p0438.md

Fix or remove invalid anchor links, adding pre-commit (#997 )

2022-01-05 15:00:02 -08:00

p0444.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

p0447.md

Generics terminology (#447 )

2021-05-10 16:42:01 -07:00

p0524.md

Generics overview (#524 )

2021-06-29 10:52:45 -07:00

p0538.md

Proposal: return; should be valid only in functions with no declared return type.

2021-06-02 11:38:29 -07:00

p0540.md

Delete the website and references (#782 )

2021-08-25 14:15:01 -07:00

p0553.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p0555.md

fix some typos (#1444 )

2022-07-20 07:01:47 +03:00

p0561.md

Basic classes: use cases, struct literals, struct types, and future work (#561 )

2021-08-09 12:28:36 -07:00

p0601.md

Operator tokens (#601 )

2021-07-08 10:39:36 -07:00

p0618.md

Update links to visible copies of docs (#1786 )

2022-07-27 17:45:05 -07:00

p0623.md

Add pre-commit check to remove trunk links from md files (#847 )

2021-09-23 09:05:21 -07:00

p0646.md

Low context-sensitivity principle (#646 )

2021-08-03 10:20:46 -07:00

p0676.md

Typo fixes in proposals (#1965 )

2022-08-11 12:06:51 -07:00

p0680.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p0702.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p0720.md

Proposal: Property naming in C++ (#720 )

2021-09-28 14:36:43 -07:00

p0722.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p0731.md

Updates to generics design details, part 1 (#3231 )

2023-09-19 19:06:47 +00:00

p0752.md

api file default public (#752 )

2021-09-21 09:33:32 -07:00

p0777.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p0818.md

Clean up some small mistakes (#2451 )

2022-12-07 15:12:08 -08:00

p0820.md

Implicit conversions (#820 )

2021-09-21 15:16:16 -07:00

p0826.md

Function return type inference (#826 )

2021-09-23 10:09:57 -07:00

p0829.md

One way principle (#829 )

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p0845.md

as expressions (#845 )

2021-10-29 16:46:19 -07:00

p0851.md

auto keyword for vars (#851 )

2022-01-10 10:08:14 -08:00

p0861.md

Naming conventions (#861 )

2022-01-27 11:25:43 -08:00

p0866.md

PR 866: Allow ties in floating literals. (#866 )

2021-10-02 11:01:29 -07:00

p0875.md

Typo fixes in proposals (#1965 )

2022-08-11 12:06:51 -07:00

p0911.md

Conditional expressions (#911 )

2022-01-28 20:07:45 -08:00

p0920.md

Replace keyword is with impls (#2483 )

2023-03-22 21:45:32 -07:00

p0931.md

Generic impls access (details 4) (#931 )

2021-12-07 09:28:08 -08:00

p0950.md

Update links to open discussion minutes archives (#1873 )

2022-08-01 16:46:19 -07:00

p0981.md

Update links to open discussion minutes archives (#1873 )

2022-08-01 16:46:19 -07:00

p0983.md

Replace keyword is with impls (#2483 )

2023-03-22 21:45:32 -07:00

p0989.md

Member access expressions (#989 )

2022-03-02 13:01:01 -08:00

p0990.md

Update Generics terminology document (#3048 )

2023-08-02 23:22:15 +00:00

p0998.md

Fix some links in proposals (#1090 )

2022-02-22 17:18:27 -08:00

p1013.md

Generics: Set associated constants using where constraints (#1013 )

2022-01-27 11:18:20 -08:00

p1025.md

Roadmap updates for 2022 (#1025 )

2022-03-16 14:43:03 -07:00

p1083.md

Spelling (#1580 )

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Update links to open discussion minutes archives (#1873 )

2022-08-01 16:46:19 -07:00

p1088.md

Replace keyword is with impls (#2483 )

2023-03-22 21:45:32 -07:00

p1144.md

Update links to open discussion minutes archives (#1873 )

2022-08-01 16:46:19 -07:00

p1146.md

Update Generics terminology document (#3048 )

2023-08-02 23:22:15 +00:00

p1154.md

Update links to open discussion minutes archives (#1873 )

2022-08-01 16:46:19 -07:00

p1178.md

Rework operator interfaces (#1178 )

2022-05-03 15:37:45 -07:00

p1190.md

Reviewer-merged PRs (#1190 )

2022-05-04 13:12:18 -07:00

p1191.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p1270.md

Spelling (#1580 )

2022-07-22 16:14:21 -07:00

p1280.md

Principle: All APIs are library APIs (#1280 )

2022-06-13 13:10:43 -07:00

p1327.md

Generics: impl forall (#1327 )

2022-06-14 19:35:53 -07:00

p1344.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

p1360.md

Change raw string literal syntax: [#]*" represents single-line string and [#]*''' represents block string (#1360 )

2022-08-25 14:04:22 -07:00

p1363.md

Make the Carbon experiment public. (#1363 )

2022-07-01 18:11:40 -07:00

p1367.md

Update workflows for security hardening. (#4192 )

2024-08-06 23:14:23 +00:00

p1382.md

Rename me -> self (#1382 )

2022-12-06 15:58:48 -08:00

p1885.md

ranged-based for for user-defined types (#1885 )

2023-08-25 23:25:19 +00:00

p1891.md

Are We Explorer Yet? (#1891 )

2022-08-26 11:50:22 -07:00

p1964.md

Auto-update pre-commit repositories and fix. (#3427 )

2023-11-28 17:17:28 +00:00

p1983.md

Weaken digit separator placement rules (#1983 )

2022-08-25 14:52:43 -07:00

p2006.md

Fix typo 'deference' (#3212 )

2023-09-11 21:24:33 +00:00

p2015.md

Numeric type literal syntax (#2015 )

2022-09-08 15:49:11 -07:00

p2022.md

Unused Pattern Bindings (Unused Function Parameters) (#2022 )

2022-09-20 17:44:22 -07:00

p2040.md

Unicode char limit (#2040 )

2022-08-16 09:41:52 -07:00

p2107.md

Clarify rules around Self and .Self (#2107 )

2022-09-08 13:04:58 -07:00

p2138.md

Checked and template generic terminology (#2138 )

2022-09-09 21:15:46 -07:00

p2173.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

p2187.md

Update sum types design (#2187 )

2022-12-12 14:08:05 -08:00

p2188.md

Pattern matching syntax and semantics (#2188 )

2023-01-06 18:30:37 -08:00

p2200.md

Auto-update pre-commit repositories and fix. (#3427 )

2023-11-28 17:17:28 +00:00

p2274.md

Update generics goals doc (#3060 )

2023-08-05 05:39:34 +00:00

p2287.md

Allow unqualified name lookup for class members (#2287 )

2022-11-09 14:34:30 -08:00

p2295.md

Begin publishing CoC and moderation transparency reports. (#2295 )

2022-10-18 10:59:08 -07:00

p2347.md

What can be done with an incomplete interface (#2347 )

2022-11-09 08:37:25 -08:00

p2360.md

chore: remove repetitive words in comments (#3813 )

2024-03-26 16:58:21 +00:00

p2365.md

Remove artificial version ceiling on C++ interop. (#2365 )

2022-11-02 19:29:05 -07:00

p2376.md

Constraints must use Self (#2376 )

2022-12-02 16:11:23 -08:00

p2483.md

Replace keyword is with impls (#2483 )

2023-03-22 21:45:32 -07:00

p2511.md

Assignment statements (#2511 )

2023-01-27 19:03:47 -08:00

p2550.md

Simplified package declaration for the Main package (#2550 )

2023-07-06 21:55:54 +00:00

p2551.md

Finish an incomplete sentence in p2551. (#2554 )

2023-01-24 16:08:41 -08:00

p2665.md

Semicolons terminate statements (#2665 )

2023-03-16 14:17:39 -07:00

p2687.md

Update pre-commit (#2919 )

2023-06-16 11:11:46 -07:00

p2759.md

Defining the 0.1 language (#2759 )

2023-04-25 18:19:06 -07:00

p2760.md

chore: fix typos (#3738 )

2024-03-04 16:27:31 +00:00

p2868.md

Allow overlap with a final impl if identical (#2868 )

2023-06-02 16:05:46 -07:00

p2875.md

Functions, function types, and function calls (#2875 )

2023-08-31 05:19:29 +00:00

p2922.md

Introduce a new Conduct team (#2922 )

2023-06-27 15:35:35 -07:00

p2964.md

Expression phase terminology (#2964 )

2023-07-06 21:45:09 +00:00

p3162.md

Update member_access.md to reflect accepted proposals (#3160 )

2023-08-31 00:17:00 +00:00

p3403.md

Change Main//default to an api file (#3403 )

2023-11-16 18:57:45 +00:00

p3407.md

Clarify name bindings in namespaces. (#3407 )

2023-11-22 22:52:08 +00:00

p3532.md

Focus implementation effort on the toolchain (#3532 )

2023-12-20 02:13:51 +00:00

p3564.md

Roadmap for 2024 and a retrospective for 2023 (#3564 )

2024-01-12 01:14:48 +00:00

p3646.md

Tuples and tuple indexing (#3646 )

2024-01-31 23:42:11 +00:00

p3720.md

Member binding operators (#3720 )

2024-05-25 02:07:34 +00:00

p3762.md

Merging forward declarations (#3762 )

2024-03-21 21:45:18 +00:00

p3763.md

Matching redeclarations (#3763 )

2024-05-20 19:13:40 +00:00

p3797.md

Raw identifier syntax (#3797 )

2024-05-01 22:28:46 +00:00

p3833.md

SemIR fidelity when representing rewrite semantics (#3833 )

2024-05-23 22:38:11 +00:00

p3848.md

Lambdas (#3848 )

2024-09-20 02:08:59 +00:00

p3927.md

More consistent package syntax (#3927 )

2024-05-16 00:55:37 +00:00

p3938.md

Exporting imported names (#3938 )

2024-05-16 23:49:52 +00:00

p3980.md

Singular extern declarations (#3980 )

2024-08-08 23:13:28 +00:00

p4075.md

Change operator precedence (#4075 )

2024-08-10 00:15:37 +00:00

p4105.md

Establish toolchain and language versioning (#4105 )

2024-07-14 06:28:46 +00:00

p4246.md

Getting commit access (#4246 )

2024-09-03 23:41:22 +00:00

README.md

Correct accepted-proposal link (#3516 )

2023-12-15 22:17:36 +00:00

README.md

Proposals

Proposal lists

Directory structure

This directory contains accepted proposals for the carbon-lang repository. For information about declined/deferred proposals, please view the proposal's original pull request.

For accepted proposals, where #### is the corresponding proposal's pull request:

p####.md will contain the main proposal text.
p#### may be present as an optional subdirectory for related files (for example, images).