rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields #88639

Emilgardis · 2021-09-04T11:28:00Z

pub struct H;
pub struct S;

pub enum FooEnum {
    HiddenTupleItem(#[doc(hidden)] H),
    MultipleHidden(#[doc(hidden)] H, #[doc(hidden)] H),
    MixedHiddenFirst(#[doc(hidden)] H, S),
    MixedHiddenLast(S, #[doc(hidden)] H),
    HiddenStruct {
        #[doc(hidden)]
        h: H,
        s: S,
    },
}

Generates

rust-highfive · 2021-09-04T11:28:03Z

r? @GuillaumeGomez

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Emilgardis · 2021-09-04T11:29:17Z

Generates from

pub enum FooEnum {
    HiddenTupleItem(#[doc(hidden)] ()),
    MultipleHidden(#[doc(hidden)] (), #[doc(hidden)] ()),
    MixedHiddenTupleItemLast((), #[doc(hidden)] ()),
    MixedHiddenTupleItemFirst(#[doc(hidden)] (), ()),
    NotHiddenTupleItem1(()),
    NotHiddenTupleItem2((), ()),
}

I don't like how the Variants are shown, preferably I'd have it as 0: /* omitted */ or something. This would probably be done in https://github.com/Emilgardis/rust/blob/838493dd0809720d9ec95680852e61a120d89838/src/librustdoc/html/render/print_item.rs#L1074-L1091 with an else clause

GuillaumeGomez · 2021-09-04T11:36:16Z

src/librustdoc/html/render/print_item.rs

@@ -944,13 +944,17 @@ fn item_union(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, s: &clean::Uni
 fn print_tuple_struct_fields(w: &mut Buffer, cx: &Context<'_>, s: &[clean::Item]) {
    for (i, ty) in s
        .iter()
-        .map(|f| if let clean::StructFieldItem(ref ty) = *f.kind { ty } else { unreachable!() })
+        .map(|f| if let clean::StructFieldItem(ref ty) = *f.kind { Some(ty) } else { None })


It should be possible at this stage, it means that the clean::Item was badly created... Can you find out where a non-StructFieldItem was added please?

Do you mean it shouldn't be possible to create a clean::Item with StructFieldItem kind?

I meant that a tuple item (when creating a new one) should only have StructFieldItem and discard everything else. (In clean/mod.rs iirc, sorry, not on computer at the moment)

The kind we end up with is

StrippedItem(StructFieldItem(Tuple([])))

my brief look into how the render works suggests to me that this is correct, and that it just needs to be handled.

Isn't there the same issue with:

pub enum Foo { Bar { x: u32, #[doc(hidden)] y: u8, } }

?

That does not panic

pub struct Foo(#[doc(hidden)] ());

does not panic either, and outputs

Which gives me the idea to do the same _ for stripped/hidden tuple field

GuillaumeGomez · 2021-09-04T11:36:42Z

Also, please add a regression test to ensure that this doesn't panic anymore in the future. But otherwise it looks like a great start, thanks!

EDIT: In src/test/rustdoc (also, please check that the output looks like what it's supposed to).

Emilgardis · 2021-09-04T17:39:47Z

I'm trying to figure out how I'd do HTML checking with @!has or @!matches. What absence should be checked?

would

// @!has issue_88600/enum.FooEnum.html '//*[@id="variant.HiddenTupleItem.field.0"]'

etc. be enough?

GuillaumeGomez · 2021-09-04T19:17:59Z

Also check that the other fields are present, but otherwise seems good.

Emilgardis · 2021-09-04T21:06:33Z

Fixed :D

Seems like

// @!has issue_88600/enum.FooEnum.html '//*[@id="variant.HiddenTupleItem.field.0"]'

doesn't actually work, need to specify a pattern to not match.

Emilgardis · 2021-09-04T21:37:37Z

looks like this now:

vs how it looks on current stable

jyn514 · 2021-09-05T09:19:26Z

I don't think this is a good idea. Enum fields are always public, they shouldn't be hidden from documentation. This should only fix the ICE, but not change the behavior (and actually I would suggest warning that doc(hidden) does nothing in that position as well).

jyn514 · 2021-09-05T09:23:27Z

Also, @GuillaumeGomez please remember to check with the team before making changes in behavior like this, this is a feature we'd have to support into the future.

Emilgardis · 2021-09-05T09:55:30Z

My previous CI run with nightly toolchain from where I encountered this ICE generate this output:

$ cargo +nightly-2021-08-21 -V
cargo 1.56.0-nightly (e96bdb0c3 2021-08-17)

so this particular change/pr is not really a change stable->nightly.

jyn514 · 2021-09-05T10:14:15Z

Well that seems like a misfeature ... But I guess if it already existed that's fine.

Have you tested this respects --document-hidden-items?

Emilgardis · 2021-09-05T10:30:22Z

Well that seems like a misfeature ... But I guess if it already existed that's fine.

Have you tested this respects --document-hidden-items?

That works just fine, I think that's because strip-hidden is not ran so no StrippedItems are made with that option.

GuillaumeGomez · 2021-09-05T12:01:35Z

Also, @GuillaumeGomez please remember to check with the team before making changes in behavior like this, this is a feature we'd have to support into the future.

My bad, I thought it was something already supported. What should we do then? Opening an FCP or just discard it and do what I suggested here?

jyn514 · 2021-09-05T14:30:07Z

@GuillaumeGomez oh no, I was just confused - I thought this was a no-op before.

GuillaumeGomez · 2021-09-05T14:33:49Z

Perfect, back to reviewing then. ;)

src/test/rustdoc/issue-88600.rs

GuillaumeGomez · 2021-09-05T14:56:22Z

Looks good to me, thanks! r=me once CI pass.

camelid · 2021-09-05T17:28:41Z

It actually looks like rustdoc's behavior for this changed between stable and 2021-08-21. I don't think that change was intentional, so I'm wondering if we should revert the behavior change in this PR before it hits stable?

camelid · 2021-09-05T17:31:03Z

It looks likely that the behavior changed in #87451.

Emilgardis · 2021-09-06T20:15:47Z

They all hide the field

Ok, then I think we should be consistent between tuple fields and struct variant fields and hide both if they have doc(hidden). (I still think it's weird rustdoc allowed this at all, but since it already exists we should support it and have it be consistent.) That means the warning won't be necessary, sorry to waste your time.

No worries! Ok, I'll fix the behaviour. I spent a good time trying to find out how to get the variant, but it's not wasted time, I now know more about the internals. Thanks for the help :)

So in summary.

#[doc(hidden)] should apply to both fields in tuple variants and struct variants.
- fields in tuple variants are hidden with _.
- fields in struct variants are hidden like in normal structs. /* (some) fields omitted */
These hidden fields should be hidden from the summary.
No warning should be emitted.

Ill add a doc-test to make sure the behaviour is consistent for both variants, I'll do this in a test called issue-88600.rs

For documentation, the lint code I ended up with was

    fn check_doc_hidden(&self, meta: &NestedMetaItem, hir_id: HirId, target: Target) -> bool {
        match target {
            Target::Field => {
                let parent_node_hir_id = self.tcx.hir().get_parent_node(hir_id);
                let parent_node = self.tcx.hir().find(parent_node_hir_id);
                if let Some(hir::Node::Variant(hir::Variant {
                    data: hir::VariantData::Tuple(..),
                    ..
                })) = parent_node
                {
                    self.tcx.struct_span_lint_hir(
                        INVALID_DOC_ATTRIBUTES,
                        hir_id,
                        meta.span(),
                        |lint| {
                            lint.build("#[doc(hidden)] does nothing on enum variant fields").emit()
                        },
                    );
                    return false;
                }
            }
            _ => {}
        }
        true
    }

Emilgardis · 2021-09-06T20:38:37Z

This is how it looks now

Emilgardis · 2021-09-06T20:40:25Z

I'd want to make sure the <code> block is checked as well, but I'm not sure how I would do that

src/librustdoc/html/render/print_item.rs

src/test/rustdoc/issue-88600.rs

this also renders them as `_`, which rustdoc previously did not.

GuillaumeGomez · 2021-09-07T12:04:48Z

Thanks!

@bors: r+

bors · 2021-09-07T12:04:49Z

📌 Commit 4a915ac has been approved by GuillaumeGomez

camelid · 2021-09-07T16:55:17Z

Accepted for backport to 1.56 beta.

@rustbot label: +beta-accepted

…aumeGomez rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields Fixes rust-lang#88600. ```rust pub struct H; pub struct S; pub enum FooEnum { HiddenTupleItem(#[doc(hidden)] H), MultipleHidden(#[doc(hidden)] H, #[doc(hidden)] H), MixedHiddenFirst(#[doc(hidden)] H, S), MixedHiddenLast(S, #[doc(hidden)] H), HiddenStruct { #[doc(hidden)] h: H, s: S, }, } ``` Generates ![image](https://user-images.githubusercontent.com/1502855/132259152-382f9517-c2a0-41d8-acd0-64e5993931fc.png)

…arth Rollup of 15 pull requests Successful merges: - rust-lang#85200 (Ignore derived Clone and Debug implementations during dead code analysis) - rust-lang#86165 (Add proc_macro::Span::{before, after}.) - rust-lang#87088 (Fix stray notes when the source code is not available) - rust-lang#87441 (Emit suggestion when passing byte literal to format macro) - rust-lang#88546 (Emit proper errors when on missing closure braces) - rust-lang#88578 (fix(rustc): suggest `items` be borrowed in `for i in items[x..]`) - rust-lang#88632 (Fix issues with Markdown summary options) - rust-lang#88639 (rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields) - rust-lang#88667 (Tweak `write_fmt` doc.) - rust-lang#88720 (Rustdoc coverage fields count) - rust-lang#88732 (RustWrapper: avoid deleted unclear attribute methods) - rust-lang#88742 (Fix table in docblocks) - rust-lang#88776 (Workaround blink/chromium grid layout limitation of 1000 rows) - rust-lang#88807 (Fix typo in docs for iterators) - rust-lang#88812 (Fix typo `option` -> `options`.) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup

[beta] backports - rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields rust-lang#88639 - Fix 2021 `dyn` suggestion that used code as label rust-lang#88657 - Workaround blink/chromium grid layout limitation of 1000 rows rust-lang#88776 - Change scope of temporaries in match guards rust-lang#88678 - Add a regression test for rust-lang#88649 rust-lang#88691 - Revert anon union parsing rust-lang#88775 - Disable validate_maintainers. rust-lang#88977 Also drop stage0 rustfmt, because that's only supposed to be used on master. r? `@Mark-Simulacrum`

rust-highfive assigned GuillaumeGomez Sep 4, 2021

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Emilgardis force-pushed the fix-issue-88600 branch from eaeed12 to 650adfc Compare September 4, 2021 21:05

jyn514 added needs-fcp This change is insta-stable, so needs a completed FCP to proceed. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. labels Sep 5, 2021

jyn514 changed the title ~~remove ICE in rustdoc on hidden tuple fields~~ Rustdoc: hide tuple fields marked with doc(hidden) Sep 5, 2021

jyn514 removed the needs-fcp This change is insta-stable, so needs a completed FCP to proceed. label Sep 5, 2021

GuillaumeGomez reviewed Sep 5, 2021

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camelid changed the title ~~Rustdoc: hide tuple fields marked with doc(hidden)~~ rustdoc: Fix ICE with doc(hidden) on tuple variant fields Sep 5, 2021

Emilgardis force-pushed the fix-issue-88600 branch from 1db6283 to 81709f2 Compare September 6, 2021 20:38

Emilgardis force-pushed the fix-issue-88600 branch from 81709f2 to 4b97a33 Compare September 6, 2021 20:39

Emilgardis commented Sep 6, 2021

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fix ICE on hidden tuple variant fields

4a915ac

this also renders them as `_`, which rustdoc previously did not.

Emilgardis force-pushed the fix-issue-88600 branch from 4b97a33 to 4a915ac Compare September 6, 2021 20:46

GuillaumeGomez approved these changes Sep 7, 2021

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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 Sep 7, 2021

rustbot added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Sep 7, 2021

GuillaumeGomez mentioned this pull request Sep 9, 2021

Rollup of 7 pull requests #88774

Closed

Manishearth mentioned this pull request Sep 10, 2021

Rollup of 15 pull requests #88824

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bors merged commit 0438048 into rust-lang:master Sep 11, 2021

rustbot added this to the 1.57.0 milestone Sep 11, 2021

Emilgardis deleted the fix-issue-88600 branch September 11, 2021 08:15

cuviper mentioned this pull request Sep 14, 2021

[beta] backports #88946

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cuviper modified the milestones: 1.57.0, 1.56.0 Sep 14, 2021

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