Implement edition hygiene for keywords by petrochenkov · Pull Request #50307 · rust-lang/rust

petrochenkov · 2018-04-29T00:22:43Z

Determine "keywordness" of an identifier in its hygienic context.
cc #49611

I've resurrected proc as an Edition-2015-only keyword for testing purposes, but it should probably be buried again. EDIT: proc is removed again.

rust-highfive · 2018-04-29T00:22:47Z

r? @aturon

(rust_highfive has picked a reviewer for you, use r? to override)

petrochenkov · 2018-04-29T00:23:02Z

r? @nikomatsakis
cc @Manishearth

Manishearth · 2018-04-29T03:37:27Z

I've resurrected proc as an Edition-2015-only keyword for testing purposes, but it should probably be buried again.

We don't need keywords that are keywords on old editions but not new, we need it the other way around 😄

Manishearth · 2018-04-29T03:41:01Z

Haven't really gone through this completely, but could you include some form of the changes from 0eabb1b so that it's less fragile? (and liberally sprinkle comments that link things together)

nikomatsakis · 2018-04-30T20:24:45Z

I continue to be nervous about the idea that macros can observe the different here -- what happens if I have a macro from a 2018 Edition crate that accepts r#async? Can a 2015 crate pass in async and have it work?

Put another way:

If I have a macro that accepts a async in its input, can I transition my crate to 2018 Edition without a breaking change?

With scheme implemented in this PR keyword hygiene and raw identifiers are entirely orthogonal.
(So this PR doesn't make changes to any interactions between raw identifiers and macros.)

If macro accepts async literally (not as $i: ident or something) in its left hand side, then it will not appear in the macro output, so we are safe even without keyword hygiene (as consumes_async!(async) shows, yeah).

nikomatsakis · 2018-04-30T20:25:15Z

I guess the answers to my question are here, maybe?

nikomatsakis · 2018-04-30T20:30:48Z

This looks pretty good so far! (modulo my questions about the desired behavior of raw idents in macros)

petrochenkov · 2018-05-03T10:18:38Z

Update: I'll return to this once I'm done with proc macro 1.2 API review, likely this weekend.

withoutboats · 2018-05-03T13:38:54Z

Why are we keeping proc reserved on 2015? We'll surely never use it for anything on the 2015 epoch.

NVM saw the comment explaining this

bors · 2018-05-07T17:36:14Z

☔ The latest upstream changes (presumably #50454) made this pull request unmergeable. Please resolve the merge conflicts.

Manishearth · 2018-05-09T20:58:58Z

any updates

petrochenkov · 2018-05-10T21:24:20Z

@Manishearth
I still need to do the plumbing mentioned in TODO (thread edition info from crate metadata into libsyntax/ext/expand.rs where it's needed).
I'll work on this tomorrow.

Manishearth · 2018-05-10T22:06:57Z

Thanks!

…

On Thu, May 10, 2018 at 2:24 PM Vadim Petrochenkov ***@***.***> wrote: @Manishearth <https://github.com/Manishearth> I still need plumbing mentioned in TODO (thread edition info from crate metadata into libsyntax/ext/expand.rs where it's needed). I'll work on this tomorrow. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#50307 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABivSKf7mMm7fnLGeeYCOCaHUMivzEx1ks5txLAigaJpZM4TrnVO> .

petrochenkov · 2018-05-13T01:07:30Z

PR updated, all tests are now fixed.
It's too late today, I'll cleanup stuff / remove proc tomorrow and it should be ready.

rust-highfive · 2018-05-13T02:20:10Z

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[01:00:15] ............test [run-pass] run-pass/mir_heavy_promoted.rs has been running for over 60 seconds
[01:00:45] ........................................................................................
[01:01:06] .....................................................................................ii.............
[01:02:04] .................................................i..................................................
[01:02:09] ..i.ii.........test [run-pass] run-pass/saturating-float-casts.rs has been running for over 60 seconds
[01:03:02] ..........iiiiiii...................................................................................
[01:03:24] ....................................................................................................
[01:03:44] ....................................................................................................
[01:04:05] ...................................................................................
---
travis_time:start:test_run-pass-fulldeps
Check compiletest suite=run-pass-fulldeps mode=run-pass (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:08:48] 
[01:08:48] running 88 tests
[01:10:38] ..........................................FFF...........................test [run-pass] run-pass-fulldeps/myriad-closures.rs has been running for over 60 seconds
[01:14:11] failures:
[01:14:11] 
[01:14:11] ---- [run-pass] run-pass-fulldeps/plugin-args-1.rs stdout ----
[01:14:11]  
[01:14:11]  
[01:14:11] error: auxiliary build of "/checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs" failed to compile: 
[01:14:11] status: exit code: 101
[01:14:11] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps/plugin-args-1.stage2-x86_64-unknown-linux-gnu.aux" "-Crpath" "-O" "-Zunstable-options" "--crate-type" "dylib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps/plugin-args-1.stage2-x86_64-unknown-linux-gnu.aux"
[01:14:11] ------------------------------------------
[01:14:11] 
[01:14:11] ------------------------------------------
[01:14:11] stderr:
---
[01:14:11]    |     ^^^^^^^^^^^^^^
[01:14:11]    |
[01:14:11]    = note: #[warn(unused_imports)] on by default
[01:14:11] 
[01:14:11] error[E0063]: missing field `edition` in initializer of `syntax::ext::base::SyntaxExtension`
[01:14:11]   --> /checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs:51:9
[01:14:11] 51 |         NormalTT {
[01:14:11] 51 |         NormalTT {
[01:14:11]    |         ^^^^^^^^ missing `edition`
[01:14:11] error: aborting due to previous error
[01:14:11] 
[01:14:11] For more information about this error, try `rustc --explain E0063`.
[01:14:11] 
[01:14:11] 
[01:14:11] ------------------------------------------
[01:14:11] 
[01:14:11] thread '[run-pass] run-pass-fulldeps/plugin-args-1.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3033:9
[01:14:11] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[01:14:11] 
[01:14:11] ---- [run-pass] run-pass-fulldeps/plugin-args-2.rs stdout ----
[01:14:11]  
[01:14:11] error: auxiliary build of "/checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs" failed to compile: 
[01:14:11] status: exit code: 101
[01:14:11] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps/plugin-args-2.stage2-x86_64-unknown-linux-gnu.aux" "-Crpath" "-O" "-Zunstable-options" "--crate-type" "dylib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps/plugin-args-2.stage2-x86_64-unknown-linux-gnu.aux"
[01:14:11] ------------------------------------------
[01:14:11] 
[01:14:11] ------------------------------------------
[01:14:11] stderr:
---
[01:14:11]    |     ^^^^^^^^^^^^^^
[01:14:11]    |
[01:14:11]    = note: #[warn(unused_imports)] on by default
[01:14:11] 
[01:14:11] error[E0063]: missing field `edition` in initializer of `syntax::ext::base::SyntaxExtension`
[01:14:11]   --> /checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs:51:9
[01:14:11] 51 |         NormalTT {
[01:14:11] 51 |         NormalTT {
[01:14:11]    |         ^^^^^^^^ missing `edition`
[01:14:11] error: aborting due to previous error
[01:14:11] 
[01:14:11] For more information about this error, try `rustc --explain E0063`.
[01:14:11] 
[01:14:11] 
[01:14:11] ------------------------------------------
[01:14:11] 
[01:14:11] thread '[run-pass] run-pass-fulldeps/plugin-args-2.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3033:9
[01:14:11] 
[01:14:11] ---- [run-pass] run-pass-fulldeps/plugin-args-3.rs stdout ----
[01:14:11]  
[01:14:11] error: auxiliary build of "/checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs" failed to compile: 
[01:14:11] thread 'main' panicked at 'Some tests failed', tools/compiletest/src/main.rs:492:22
[01:14:11] status: exit code: 101
[01:14:11] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps/plugin-args-3.stage2-x86_64-unknown-linux-gnu.aux" "-Crpath" "-O" "-Zunstable-options" "--crate-type" "dylib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps/plugin-args-3.stage2-x86_64-unknown-linux-gnu.aux"
[01:14:11] ------------------------------------------
[01:14:11] 
[01:14:11] ------------------------------------------
[01:14:11] stderr:
---
[01:14:11]    |     ^^^^^^^^^^^^^^
[01:14:11]    |
[01:14:11]    = note: #[warn(unused_imports)] on by default
[01:14:11] 
[01:14:11] error[E0063]: missing field `edition` in initializer of `syntax::ext::base::SyntaxExtension`
[01:14:11]   --> /checkout/src/test/run-pass-fulldeps/auxiliary/plugin_args.rs:51:9
[01:14:11] 51 |         NormalTT {
[01:14:11] 51 |         NormalTT {
[01:14:11]    |         ^^^^^^^^ missing `edition`
[01:14:11] error: aborting due to previous error
[01:14:11] 
[01:14:11] For more information about this error, try `rustc --explain E0063`.
[01:14:11] 
---
[01:14:11] test result: FAILED. 85 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out
[01:14:11] 
[01:14:11] 
[01:14:11] 
[01:14:11] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/run-pass-fulldeps" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass-fulldeps" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "run-pass" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-3.9/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Zunstable-options " "--target-rustcflags" "-Crpath -O -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "3.9.1\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[01:14:11linux-gnu/release
41260 ./src/llvm/test/CodeGen/X86
40772 ./src/libcompiler_builtins
40268 ./src/libcompiler_builtins/compiler-rt

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

bors · 2018-05-13T03:54:37Z

☔ The latest upstream changes (presumably #50235) made this pull request unmergeable. Please resolve the merge conflicts.

rust-highfive · 2018-05-17T07:18:14Z

The job x86_64-gnu-debug of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:03:48]    Compiling syntax_pos v0.0.0 (file:///checkout/src/libsyntax_pos)
[00:03:49]    Compiling rustc_errors v0.0.0 (file:///checkout/src/librustc_errors)
[00:03:51]    Compiling backtrace v0.3.6
[00:04:03]    Compiling proc_macro v0.0.0 (file:///checkout/src/libproc_macro)
[00:04:03] error[E0425]: cannot find function `is_path_segment_keyword` in module `token`
[00:04:03]    --> libproc_macro/lib.rs:821:19
[00:04:03]     |
[00:04:03] 821 |            token::is_path_segment_keyword(ast::Ident::with_empty_ctxt(ident.sym)) {
[00:04:03]     |                   ^^^^^^^^^^^^^^^^^^^^^^^ not found in `token`
[00:04:04] error: aborting due to previous error
[00:04:04] 
[00:04:04] For more information about this error, try `rustc --explain E0425`.
[00:04:04] error: Could not compile `proc_macro`.
[00:04:04] error: Could not compile `proc_macro`.
[00:04:04] 
[00:04:04] Caused by:
[00:04:04]   process didn't exit successfully: `/checkout/obj/build/bootstrap/debug/rustc --crate-name proc_macro libproc_macro/lib.rs --color always --error-format json --crate-type dylib --emit=dep-info,metadata -C prefer-dynamic -C debug-assertions=off -C overflow-checks=on -C metadata=f65e917d1a6aeb8a -C extra-filename=-f65e917d1a6aeb8a --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps --target x86_64-unknown-linux-gnu -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps --extern rustc_errors=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_errors-24d16f00de0b3e02.rmeta --extern rustc_data_structures=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_data_structures-750c848698d19171.rmeta --extern syntax_pos=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libsyntax_pos-54e4cced589011ca.rmeta --extern syntax=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libsyntax-b878b60a3b79382b.rmeta` (exit code: 101)
[00:04:04] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "check" "--target" "x86_64-unknown-linux-gnu" "-j" "4" "--release" "--color" "always" "--features" " jemalloc" "--manifest-path" "/checkout/src/rustc/Cargo.toml" "--message-format" "json"
[00:04:04] expected success, got: exit code: 101
[00:04:04] thread 'main' panicked at 'cargo must succeed', bootstrap/compile.rs:1091:9
[00:04:04] travis_fold:end:stage0-rustc

[00:04:04] travis_time:end:stage0-rustc:start=1526541407644825260,finish=1526541444689757796,duration=37044932536

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

petrochenkov · 2018-05-17T10:09:02Z

Needs rebase.

petrochenkov · 2018-05-17T20:33:41Z

@bors r=nikomatsakis

bors · 2018-05-17T20:33:42Z

📌 Commit d8bbc1e has been approved by nikomatsakis

bors · 2018-05-18T10:57:12Z

⌛ Testing commit d8bbc1e with merge df40e61...

Implement edition hygiene for keywords Determine "keywordness" of an identifier in its hygienic context. cc #49611 I've resurrected `proc` as an Edition-2015-only keyword for testing purposes, but it should probably be buried again. EDIT: `proc` is removed again.

bors · 2018-05-18T13:13:37Z

☀️ Test successful - status-appveyor, status-travis
Approved by: nikomatsakis
Pushing df40e61 to master...

cramertj · 2018-06-06T17:19:42Z

@petrochenkov Looking over this PR I'm unable to find a way to get the current edition while parsing (not necessarily in a macro). Should the edition be passed down into the parser, or is there something else I should be using to determine if something is a keyword in the current edition while parsing?

petrochenkov · 2018-06-09T14:19:20Z

@cramertj

a way to get the current edition

hygiene::default_edition()
(aka edition of the "root" hygienic context (no expansion) aka DUMMY_SP.edition(), edition needs to be kept in global data like other hygiene-related things)

petrochenkov · 2018-06-09T14:23:14Z

@cramertj

is there something else I should be using to determine if something is a keyword

For a given identifier is_reserved_ident should automatically return the correct answer adjusted for editions, without additional user intervention.

`async` was added in rust-lang/rust#50307 and is not yet implemented `try` was added in rust-lang/rust#52602 and is not yet stable: rust-lang/rust#31436

rust-highfive assigned aturon Apr 29, 2018

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Apr 29, 2018

rust-highfive assigned nikomatsakis and unassigned aturon Apr 29, 2018

petrochenkov force-pushed the keyhyg2 branch from 23fa4a4 to a81cd0e Compare April 29, 2018 00:46

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 Apr 30, 2018

nikomatsakis reviewed Apr 30, 2018

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nikomatsakis mentioned this pull request May 2, 2018

Edition-gated keywords #49611

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withoutboats reviewed May 3, 2018

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scottmcm mentioned this pull request May 5, 2018

Tracking issue for RFC 2388, reserve the try keyword and resolve do catch { .. } syntax question with try { .. } #50412

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6 tasks

withoutboats mentioned this pull request May 9, 2018

Tracking issue for async/await (RFC 2394) #50547

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11 tasks

petrochenkov force-pushed the keyhyg2 branch from a81cd0e to 82d3d28 Compare May 13, 2018 01:04

petrochenkov force-pushed the keyhyg2 branch from 82d3d28 to 3d6f635 Compare May 13, 2018 13:57

petrochenkov changed the title ~~[WIP] Implement edition hygiene for keywords~~ Implement edition hygiene for keywords May 13, 2018

petrochenkov added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 13, 2018

kennytm 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 17, 2018

petrochenkov added 9 commits May 17, 2018 23:13

Move definition of Edition from libsyntax to libsyntax_pos

ee5b1e1

Add edition to expansion info

640884b

Add two keywords specific to editions 2015 and 2018 respectively

f89e356

Add tests

cd4925d

Keep crate edition in metadata

76bf345

Pass crate editions to macro expansions, update tests

f4cbc23

Turn some functions from token.rs into methods on Ident

c4352ff

Remove the proc keyword again

dae5f05

Fix rebase

d8bbc1e

petrochenkov force-pushed the keyhyg2 branch from 3d6f635 to d8bbc1e Compare May 17, 2018 20:33

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 17, 2018

withoutboats mentioned this pull request May 17, 2018

[WIP] async functions #50850

Closed

9 tasks

bors merged commit d8bbc1e into rust-lang:master May 18, 2018

petrochenkov mentioned this pull request May 20, 2018

TokenStream::parse does not resolve with Span::call_site() #50050

Closed

petrochenkov deleted the keyhyg2 branch June 5, 2019 16:05

compiler-errors mentioned this pull request Nov 15, 2024

borrowcheck error in code generated in a macro due to 2024 impl trait capture changes #132917

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