Checking that function is const if marked with rustc_const_unstable #86838

lambinoo · 2021-07-03T10:09:14Z

This one is still missing tests to check the behavior but I checked by hand and it seemed to work.
I would not mind some direction for writing those unit tests!

rust-highfive · 2021-07-03T10:09:16Z

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @LeSeulArtichaut (or someone else) soon.

Please see the contribution instructions for more information.

LeSeulArtichaut

Thanks for the PR! Here's a first quick review

compiler/rustc_passes/src/stability.rs

LeSeulArtichaut · 2021-07-03T10:49:43Z

I would not mind some direction for writing those unit tests!

For the unit test, you'll probably want something like this:

#[crate_type = "lib"]
#![feature(staged_api)]
#![stable(feature = "foo", since = "1.0.0")]

#[stable(feature = "foo", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_foo", issue = "none")]
pub fn foo() {}
// ~^ ERROR attributes `#[rustc_const_unstable]` and `#[rustc_const_stable]` require the function to be marked `const`

// ... test other cases, like rustc_const_unstable on impl items

For more info on how to write tests for the compiler please read the rustc-dev-guide.

Also, please squash your " removing unwanted edit" commit with the first commit.

lambinoo · 2021-07-03T13:34:17Z

I think I added support for methods and trait functions like you pointed out.
Just to be sure, to properly squashed, I had to rebase + force push, right?

lambinoo · 2021-07-03T19:38:42Z

Apparently, implementing this checks make a bunch of other test fail. Should I go ahead and fix them at the same time in this PR?

LeSeulArtichaut · 2021-07-03T19:44:28Z

A commit must pass all tests to be merged (that's what @bors does), so you have to fix the tests here.

lambinoo · 2021-07-03T19:46:57Z

I was more wondering if opening a secondary PR was necessary but I will do it with this one then!

LeSeulArtichaut

Okay, looks pretty good to me, but ultimately I don't really know much about const functions, so I'd prefer to pass this to someone else. Left a few nitpicks.

compiler/rustc_passes/src/stability.rs

src/test/ui/consts/rustc-const-stability-require-const.rs

compiler/rustc_passes/src/stability.rs

LeSeulArtichaut · 2021-07-03T23:49:48Z

r? @oli-obk

compiler/rustc_passes/src/stability.rs

oli-obk · 2021-07-06T16:05:52Z

src/test/ui/consts/rustc-const-stability-require-const.rs

+#[stable(feature = "potato", since = "1.0.0")]
+pub struct Potato;
+
+impl Potato {


please also add a test for the unstable impl const Trait for Type, the attribute works on the impl there, not on the methods. the method sigs also have no const modifier

I think that's what is being tested on this one, no?

rust/src/test/ui/consts/rustc-impl-const-stability.rs

Lines 15 to 21 in aadad14

#[stable(feature = "potato", since = "1.27.0")]

impl const Default for Data {

#[rustc_const_unstable(feature = "data_foo", issue = "none")]

fn default() -> Data {

Data { _data: 42 }

}

}

apologies, I completely overlooked that

No need to apologies! Thank you for giving me some of your time to check up on that MR!

On a side note, I'd like to get more involved as I've been a very happy user for a while. Any part of the compiler/libraries I should look at to be useful?

oli-obk · 2021-07-06T18:01:12Z

@bors r+

bors · 2021-07-06T18:01:14Z

📌 Commit aadad14 has been approved by oli-obk

…e_check_const, r=oli-obk Checking that function is const if marked with rustc_const_unstable Fixes rust-lang#69630 This one is still missing tests to check the behavior but I checked by hand and it seemed to work. I would not mind some direction for writing those unit tests!

JohnTitor · 2021-07-07T22:56:12Z

Failed in rollup: #86960 (comment)
@bors r-

remove trailing newline fix: test with attribute but missing const Update compiler/rustc_passes/src/stability.rs Co-authored-by: Léo Lanteri Thauvin <leseulartichaut@gmail.com> Add test for extern functions fix: using span_help instead of span_suggestion add test for some ABIs + fmt fix Update compiler/rustc_passes/src/stability.rs Co-authored-by: Léo Lanteri Thauvin <leseulartichaut@gmail.com> Refractor and add test for `impl const` Add test to make sure no output + cleanup condition ----------------------------- remove stdcall test, failing CI test C abi is already tested in this, so it is not that useful to test another one. The tested code is blind to which specific ABI for now, as long as it's not an intrinsic one

lambinoo · 2021-07-08T05:53:51Z

Testing stdcall AND the C ABI was probably overzealous, as the tested code is blind to which ABI the function has, as long as it's not an intrinsic (for now at least).

oli-obk · 2021-07-08T16:07:13Z

@bors r+

bors · 2021-07-08T16:07:15Z

📌 Commit 07f903e has been approved by oli-obk

…laumeGomez Rollup of 8 pull requests Successful merges: - rust-lang#84961 (Rework SESSION_GLOBALS API) - rust-lang#86726 (Use diagnostic items instead of lang items for rfc2229 migrations) - rust-lang#86789 (Update BTreeSet::drain_filter documentation) - rust-lang#86838 (Checking that function is const if marked with rustc_const_unstable) - rust-lang#86903 (Fix small headers display) - rust-lang#86913 (Document rustdoc with `--document-private-items`) - rust-lang#86957 (Update .mailmap file) - rust-lang#86971 (mailmap: Add alternative addresses for myself) Failed merges: - rust-lang#86869 (Account for capture kind in auto traits migration) r? `@ghost` `@rustbot` modify labels: rollup

rust-highfive assigned LeSeulArtichaut Jul 3, 2021

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lambinoo force-pushed the I-69630-rust_const_unstable_check_const branch from 00ed975 to e7dfeb5 Compare July 3, 2021 13:32

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lambinoo force-pushed the I-69630-rust_const_unstable_check_const branch from 9f609eb to 80203f4 Compare July 3, 2021 20:18

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bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jul 6, 2021

JohnTitor mentioned this pull request Jul 7, 2021

Rollup of 9 pull requests #86960

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bors 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 7, 2021

lambinoo force-pushed the I-69630-rust_const_unstable_check_const branch from aadad14 to 07f903e Compare July 8, 2021 05:52

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 Jul 8, 2021

GuillaumeGomez mentioned this pull request Jul 8, 2021

Rollup of 8 pull requests #86982

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bors merged commit d85718a into rust-lang:master Jul 8, 2021

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Checking that function is const if marked with rustc_const_unstable #86838

Checking that function is const if marked with rustc_const_unstable #86838

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bors commented Jul 8, 2021

	#[stable(feature = "potato", since = "1.27.0")]
	impl const Default for Data {
	#[rustc_const_unstable(feature = "data_foo", issue = "none")]
	fn default() -> Data {
	Data { _data: 42 }
	}
	}

Checking that function is const if marked with rustc_const_unstable #86838

Checking that function is const if marked with rustc_const_unstable #86838

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