Enforce well formedness for type alias impl trait's hidden type #95519

oli-obk · 2022-03-31T13:55:36Z

This was not an issue with return-position-impl-trait because the generic bounds of the function are the same as those of the opaque type, and the hidden type must already be well formed within the function.

With type-alias-impl-trait the hidden type could be defined in a function that has more lifetime bounds than the type alias. This is fine, but the hidden type must still be well formed without those additional bounds.

rust-highfive · 2022-03-31T13:55:39Z

r? @cjgillot

(rust-highfive has picked a reviewer for you, use r? to override)

oli-obk · 2022-04-06T12:58:19Z

compiler/rustc_data_structures/src/vec_map.rs

@@ -144,7 +144,7 @@ impl<'a, K, V> IntoIterator for &'a VecMap<K, V> {
    }
 }

-impl<'a, K, V> IntoIterator for &'a mut VecMap<K, V> {
+impl<'a, K: 'a, V: 'a> IntoIterator for &'a mut VecMap<K, V> {


The reason this is required is that associated type alias impl trait does not imply bounds from the type that the impl is for.

Should we be concerned for breakage and get a lang team signoff?

Nope, this is just a nightly feature. We can add more implicit magic later

yeah, i think this is something we can fix later

cjgillot · 2022-04-07T20:10:55Z

I am probably not the right reviewer for type-related stuff.
r? @compiler-errors

compiler-errors

loooks good, and it's behind a feature-gate anyways so i'm not worried about the regression in associated TAIT.

@bors r+

compiler-errors · 2022-04-07T20:32:24Z

compiler/rustc_data_structures/src/vec_map.rs

@@ -144,7 +144,7 @@ impl<'a, K, V> IntoIterator for &'a VecMap<K, V> {
    }
 }

-impl<'a, K, V> IntoIterator for &'a mut VecMap<K, V> {
+impl<'a, K: 'a, V: 'a> IntoIterator for &'a mut VecMap<K, V> {


yeah, i think this is something we can fix later

compiler-errors · 2022-04-07T20:34:51Z

oh lol bors does not respond to approval messages it seems

@bors r+
@bors rollup=never (so we can bisect this better later, feel free to change rollup status as you see fit)

bors · 2022-04-07T20:34:53Z

📌 Commit b30bcfa has been approved by compiler-errors

bors · 2022-04-08T03:32:16Z

⌛ Testing commit b30bcfa with merge b13b9f84bef48e5857378c07094fa59e8986f76c...

bors · 2022-04-08T04:12:51Z

💔 Test failed - checks-actions

compiler-errors · 2022-04-08T04:33:24Z

Same failure as referenced in #95775 (comment) ?

@bors retry

bors · 2022-04-08T05:40:00Z

⌛ Testing commit b30bcfa with merge 18cc4c9bd0d07bbdcc76a5dbfeb876f6b0e61322...

bors · 2022-04-08T05:43:19Z

💔 Test failed - checks-actions

rust-log-analyzer · 2022-04-08T05:47:13Z

The job x86_64-msvc-1 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Some tests failed in compiletest suite=ui-fulldeps mode=ui host=x86_64-pc-windows-msvc target=x86_64-pc-windows-msvc

error: test run failed!
status: exit code: 101
command: PATH="D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2\lib\rustlib\x86_64-pc-windows-msvc\lib;C:\Program Files (x86)\Windows Kits\10\bin\x64;C:\Program Files (x86)\Windows Kits\10\bin\10.0.22000.0\x64;C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64;C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64;D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage0-bootstrap-tools\x86_64-pc-windows-msvc\release\deps;D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage0\bin;D:\a\rust\rust\ninja;D:\a\rust\rust\msys2\mingw64\bin;C:\hostedtoolcache\windows\Python\3.10.4\x64\Scripts;C:\hostedtoolcache\windows\Python\3.10.4\x64;C:\msys64\usr\bin;D:\a\rust\rust\sccache;C:\Program Files\MongoDB\Server\5.0\bin;C:\aliyun-cli;C:\vcpkg;C:\cf-cli;C:\Program Files (x86)\NSIS;C:\tools\zstd;C:\Program Files\Mercurial;C:\hostedtoolcache\windows\stack\2.7.5\x64;C:\cabal\bin;C:\ghcup\bin;C:\tools\ghc-9.2.2\bin;C:\Program Files\dotnet;C:\mysql\bin;C:\Program Files\R\R-4.1.3\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\bin;C:\Program Files (x86)\pipx_bin;C:\hostedtoolcache\windows\go\1.15.15\x64\bin;C:\hostedtoolcache\windows\Python\3.7.9\x64\Scripts;C:\hostedtoolcache\windows\Python\3.7.9\x64;C:\hostedtoolcache\windows\Ruby\2.5.9\x64\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\8.0.322-6\x64\bin;C:\npm\prefix;C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\Program Files\Eclipse Foundation\jdk-8.0.302.8-hotspot\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\ProgramData\Chocolatey\bin;C:\Program Files\Docker;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\dotnet;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn;C:\Program Files (x86)\Microsoft SQL Server\120\DTS\Binn;C:\Program Files (x86)\Microsoft SQL Server\130\DTS\Binn;C:\Program Files (x86)\Microsoft SQL Server\140\DTS\Binn;C:\Program Files (x86)\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\nodejs;C:\Program Files\OpenSSL\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files\CMake\bin;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.8.5\bin;C:\Program Files\Microsoft Service Fabric\bin\Fabric\Fabric.Code;C:\Program Files\Microsoft SDKs\Service Fabric\Tools\ServiceFabricLocalClusterManager;C:\Program Files\Git\cmd;C:\Program Files\Git\mingw64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\SeleniumWebDrivers\ChromeDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files (x86)\Google\Cloud SDK\google-cloud-sdk\bin;C:\Program Files (x86)\Microsoft BizTalk Server;C:\Program Files\LLVM\bin;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\test\\ui-fulldeps\\stdio-from\\a.exe"
stdout: none
--- stderr -------------------------------
I/O error: operation failed to complete synchronously
thread 'main' panicked at 'assertion failed: child2.wait()?.success()', D:\a\rust\rust\src/test\ui-fulldeps\stdio-from.rs:50:5
------------------------------------------




failures:
    [ui] src/test\ui-fulldeps\stdio-from.rs

test result: FAILED. 65 passed; 1 failed; 1 ignored; 0 measured; 0 filtered out; finished in 25.47s

Build completed unsuccessfully in 0:35:06
make: *** [Makefile:72: ci-subset-1] Error 1

oli-obk · 2022-04-08T06:18:08Z

@bors retry #95759

rust-log-analyzer · 2022-04-08T09:11:01Z

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

lqd · 2022-04-08T09:21:56Z

edit: this different network error just took 3 hours to be displayed, it's not a new failure...

bors · 2022-04-08T20:45:19Z

⌛ Testing commit b30bcfa with merge f4a7ce9...

bors · 2022-04-08T23:25:55Z

☀️ Test successful - checks-actions
Approved by: compiler-errors
Pushing f4a7ce9 to master...

rust-timer · 2022-04-09T00:39:01Z

Finished benchmarking commit (f4a7ce9): comparison url.

Summary:

Primary benchmarks: no relevant changes found
Secondary benchmarks: mixed results

	Regressions 😿 (primary)	Regressions 😿 (secondary)	Improvements 🎉 (primary)	Improvements 🎉 (secondary)	All 😿 🎉 (primary)
count¹	0	1	0	1	0
mean²	N/A	0.3%	N/A	-0.4%	N/A
max	N/A	0.3%	N/A	-0.4%	N/A

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

number of relevant changes ↩
the arithmetic mean of the percent change ↩

Enforce well formedness for type alias impl trait's hidden type

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Fix some fallout around type alias impl trait in associated types

b30bcfa

oli-obk force-pushed the tait_ub2 branch from f83e03c to b30bcfa Compare April 6, 2022 12:56

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oli-obk commented Apr 6, 2022

View reviewed changes

rust-highfive assigned compiler-errors and unassigned cjgillot Apr 7, 2022

compiler-errors approved these changes Apr 7, 2022

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bors merged commit f4a7ce9 into rust-lang:master Apr 8, 2022

rustbot added this to the 1.62.0 milestone Apr 8, 2022

aliemjay mentioned this pull request Apr 11, 2022

TAIT regression: requires new lifetime bounds #95922

Closed

oli-obk deleted the tait_ub2 branch April 11, 2022 14:30

MingweiSamuel mentioned this pull request Apr 11, 2022

Build broken by type alias enforcing outlives relations hydro-project/hydroflow#139

Closed

inquisitivecrystal mentioned this pull request Jun 2, 2022

Possible regression with type_alias_impl_trait #97651

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Enforce well formedness for type alias impl trait's hidden type #95519

Enforce well formedness for type alias impl trait's hidden type #95519

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Enforce well formedness for type alias impl trait's hidden type #95519

Enforce well formedness for type alias impl trait's hidden type #95519

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