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Reserve prefixed identifiers and literals (RFC 3101) #85359

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Merged
merged 14 commits into from
Jun 27, 2021
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Reserve prefixed identifiers and literals (RFC 3101) #85359

merged 14 commits into from
Jun 27, 2021

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lrh2000
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@lrh2000 lrh2000 commented May 16, 2021 •
edited by m-ou-se
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This PR denies any identifiers immediately followed by one of three tokens ", ' or #, which is stricter than the requirements of RFC 3101 but may be necessary according to the discussion at Zulip.

The tracking issue #84599 says we'll add a feature gate named reserved_prefixes, but I don't think I can do this because it is impossible for the lexer to know whether a feature is enabled or not. I guess determining the behavior by the edition information should be enough.

Fixes #84599

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r? @jackh726

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 16, 2021
@lrh2000 lrh2000 force-pushed the reserved-prefixes branch from 582d02e to 4424c8c Compare May 16, 2021 03:45
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cc #84037 (one more in-progress implementation) @Julian-Wollersberger

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Could you assign this to me for the final implementation review, once it's decided who will implement this and what are the rules regarding raw strings etc.

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Added some more comments on zulip (archive).

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lrh2000 commented May 16, 2021

cc #84037 (one more in-progress implementation) @Julian-Wollersberger

I guess it mainly focuses on implements the k# proposal now?

Could you assign this to me for the final implementation review, once it's decided who will implement this and what are the rules regarding raw strings etc.

OK, I'll do this.

Added some more comments on zulip (archive).

Thanks for your detailed feedback!

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r? @petrochenkov

@petrochenkov petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 16, 2021
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I guess it mainly focuses on implements the k# proposal now?

Yes, and #84037 touches almost the same code. But since the k#foo RFC isn't accepted yet, it'll take some time. So I'd suggest that you (@lrh2000) go forward with this PR, and I'll later rebase or close the other one. (I don't have a strong opinion there.) Sounds good?

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lrh2000 commented May 22, 2021 •
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Yes, and #84037 touches almost the same code. But since the k#foo RFC isn't accepted yet, it'll take some time. So I'd suggest that you (@lrh2000) go forward with this PR, and I'll later rebase or close the other one. (I don't have a strong opinion there.) Sounds good?

@Julian-Wollersberger Yes, it sounds good. Sorry for the reply delay since I'm really busy in the past several days.

I don't think we have reached an agreement on the implementation details now (see discussions at #84978), so this PR may also take some time and the code may be completely rewritten.

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I think you @'ed the wrong jack @lrh2000

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lrh2000 commented May 22, 2021

I think you @'ed the wrong jack @lrh2000

Oops, what a big mistake! I've fixed this and really sorry to bother you.

@crlf0710 crlf0710 added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jun 11, 2021
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m-ou-se commented Jun 14, 2021

Hope you don't mind, but I pushed the changes i suggested above, and added a migration lint for cargo fix --edition together with a test for that.

@m-ou-se m-ou-se added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Jun 14, 2021
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This looks good to me. I left some nits.

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@m-ou-se m-ou-se force-pushed the reserved-prefixes branch from dbf85fa to 8a7b3ae Compare June 14, 2021 14:20
@lrh2000 lrh2000 force-pushed the reserved-prefixes branch from 4e70c36 to 2bcd663 Compare June 26, 2021 15:13
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r? @nikomatsakis @bors r=nikomatsakis

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bors commented Jun 27, 2021

📌 Commit f6dd137 has been approved by nikomatsakis

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 27, 2021
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bors commented Jun 27, 2021

⌛ Testing commit f6dd137 with merge e8cb1a4...

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bors commented Jun 27, 2021

☀️ Test successful - checks-actions
Approved by: nikomatsakis
Pushing e8cb1a4 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Jun 27, 2021
@bors bors merged commit e8cb1a4 into rust-lang:master Jun 27, 2021
@rustbot rustbot added this to the 1.55.0 milestone Jun 27, 2021
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asdf8dfafjk commented Jul 26, 2021 •
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This may be known to most people here but Scala allows people to make their own prefixes, say sql"" without the use of any compiler plugins. Here are some more details https://www.scala-lang.org/api/2.12.2/scala/StringContext.html

I'd love to see that being supported by compiler and a very small number of useful individual prefixes in the std-lib.

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A-edition-2021 Area: The 2021 edition A-parser Area: The lexing & parsing of Rust source code to an AST merged-by-bors This PR was explicitly merged by bors. S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Implement RFC: Reserved prefixes in the 2021 edition