parse: unify item parsing & filter illegal item kinds #69366

Centril · 2020-02-22T08:38:37Z

This PR fully unifies item parsing into a single fn parse_item_common method which produces Option<Item>. The Item is then mapped into ForeignItem and AssocItem as necessary by transforming the *Kind and converting contextually bad variants into None, thereby filtering them away.

The PR does not yet unmerge the definition of ForeignItemKind from AssocItemKind. I've left that as future work as it didn't feel like this parser-focused PR would be the best one to deal with it. Changes to the AST data structures are instead kept to a reasonable minimum.

Based on #69361.

Fixes #48137.
RELNOTES: Now, item macro fragments can be interpolated into impl, trait, and extern contexts. See src/test/ui/parser/issue-48137-macros-cannot-interpolate-impl-items.rs for the relevant test.

r? @petrochenkov
cc @estebank

src/libsyntax/ast.rs

src/librustc_parse/parser/item.rs

src/test/ui/parser/default-on-wrong-item-kind.stderr

petrochenkov · 2020-02-22T10:41:07Z

This almost fixes #48137 (which is the end goal here), except that #69366 (comment) needs to be fixed and maybe_whole!(NtItem) needs to be moved inside parse_item_common.

petrochenkov · 2020-02-22T10:43:39Z

LGTM in general, except I disagree with placing Defaultness into Item and the defaultness parsing rules not aligning with #69366 (comment).

petrochenkov · 2020-02-22T10:45:56Z

The super-goal is making parse_stmt the basic routine instead of parse_item and handling stuff like lets and other copypaste from function bodies at module level gracefully :)

src/librustc_parse/parser/item.rs

src/test/ui/parser/issue-48137-macros-cannot-interpolate-impl-items.rs

petrochenkov · 2020-02-23T11:13:03Z

Left a few wording nits regarding incomplete sentences in primary messages.

Centril · 2020-02-23T11:19:10Z

Also, I threw in a small refactoring 0564b71 which I had not pushed yet.

petrochenkov · 2020-02-23T11:21:41Z

Also, I threw in a small refactoring 0564b71 which I had not pushed yet.

Yeah, I've seen it.

petrochenkov · 2020-02-23T12:32:47Z

@bors r+

bors · 2020-02-23T12:32:48Z

📌 Commit d7f39d5613026024eade9fb4377c4b7be4a1d71b has been approved by petrochenkov

Centril · 2020-02-24T00:11:44Z

@bors r=petrochenkov

bors · 2020-02-24T00:11:45Z

📌 Commit 1c75f5a has been approved by petrochenkov

bors · 2020-02-24T00:31:10Z

⌛ Testing commit 1c75f5a with merge 79cd224...

bors · 2020-02-24T03:43:20Z

☀️ Test successful - checks-azure
Approved by: petrochenkov
Pushing 79cd224 to master...

rust-highfive · 2020-02-24T03:44:41Z

📣 Toolstate changed by #69366!

Tested on commit 79cd224.
Direct link to PR: #69366

💔 clippy-driver on windows: test-pass → build-fail (cc @mcarton @oli-obk @Manishearth @flip1995 @yaahc @phansch @llogiq).
💔 clippy-driver on linux: test-pass → build-fail (cc @mcarton @oli-obk @Manishearth @flip1995 @yaahc @phansch @llogiq).

@mcarton

Tested on commit rust-lang/rust@79cd224. Direct link to PR: <rust-lang/rust#69366> 💔 clippy-driver on windows: test-pass → build-fail (cc @mcarton @oli-obk @Manishearth @flip1995 @yaahc @phansch @llogiq). 💔 clippy-driver on linux: test-pass → build-fail (cc @mcarton @oli-obk @Manishearth @flip1995 @yaahc @phansch @llogiq).

Rustup to rust-lang/rust#69366 changelog: none

Update Clippy from 8fbb23f to fc5d0cc Fixes #69419 ``` Fix false positive in `missing_const_for_fn` Rustup to #69366 Add new lint [`wildcard imports`]. Add suggestion to [`enum_glob_use`] Add new lint `lossy_float_literal` to detect lossy whole number float literals ```

@Centril

syntax: Remove `Nt(Impl,Trait,Foreign)Item` Follow-up to rust-lang#69366. r? @Centril

@Centril

syntax: Remove `Nt(Impl,Trait,Foreign)Item` Follow-up to rust-lang#69366. r? @Centril

Pkgsrc changes: * Bump rust bootstrap version to 1.42.0, except for Darwin/i686 where the bootstrap is not (yet?) available. Upstream changes: Version 1.43.0 (2020-04-23) ========================== Language -------- - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having the type inferred correctly.][68129] - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201] **Syntax only changes** - [Allow `type Foo: Ord` syntactically.][69361] - [Fuse associated and extern items up to defaultness.][69194] - [Syntactically allow `self` in all `fn` contexts.][68764] - [Merge `fn` syntax + cleanup item parsing.][68728] - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366] For example, you may now write: ```rust macro_rules! mac_trait { ($i:item) => { trait T { $i } } } mac_trait! { fn foo() {} } ``` These are still rejected *semantically*, so you will likely receive an error but these changes can be seen and parsed by macros and conditional compilation. Compiler -------- - [You can now pass multiple lint flags to rustc to override the previous flags.][67885] For example; `rustc -D unused -A unused-variables` denies everything in the `unused` lint group except `unused-variables` which is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies everything in the `unused` lint group **including** `unused-variables` since the allow flag is specified before the deny flag (and therefore overridden). - [rustc will now prefer your system MinGW libraries over its bundled libraries if they are available on `windows-gnu`.][67429] - [rustc now buffers errors/warnings printed in JSON.][69227] Libraries --------- - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>` respectively.][69538] **Note** These conversions are only available when `N` is `0..=32`. - [You can now use associated constants on floats and integers directly, rather than having to import the module.][68952] e.g. You can now write `u32::MAX` or `f32::NAN` with no imports. - [`u8::is_ascii` is now `const`.][68984] - [`String` now implements `AsMut<str>`.][68742] - [Added the `primitive` module to `std` and `core`.][67637] This module reexports Rust's primitive types. This is mainly useful in macros where you want avoid these types being shadowed. - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642] - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738] Stabilized APIs --------------- - [`Once::is_completed`] - [`f32::LOG10_2`] - [`f32::LOG2_10`] - [`f64::LOG10_2`] - [`f64::LOG2_10`] - [`iter::once_with`] Cargo ----- - [You can now set config `[profile]`s in your `.cargo/config`, or through your environment.][cargo/7823] - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's executable path when running integration tests or benchmarks.][cargo/7697] `<name>` is the name of your binary as-is e.g. If you wanted the executable path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`. Misc ---- - [Certain checks in the `const_err` lint were deemed unrelated to const evaluation][69185], and have been moved to the `unconditional_panic` and `arithmetic_overflow` lints. Compatibility Notes ------------------- - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This has been a warning since 1.36.0. - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly led to some instances being accepted, and now correctly emits a hard error. [69340]: rust-lang/rust#69340 Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of `rustc` and related tools. - [All components are now built with `opt-level=3` instead of `2`.][67878] - [Improved how rustc generates drop code.][67332] - [Improved performance from `#[inline]`-ing certain hot functions.][69256] - [traits: preallocate 2 Vecs of known initial size][69022] - [Avoid exponential behaviour when relating types][68772] - [Skip `Drop` terminators for enum variants without drop glue][68943] - [Improve performance of coherence checks][68966] - [Deduplicate types in the generator witness][68672] - [Invert control in struct_lint_level.][68725] [67332]: rust-lang/rust#67332 [67429]: rust-lang/rust#67429 [67637]: rust-lang/rust#67637 [67642]: rust-lang/rust#67642 [67878]: rust-lang/rust#67878 [67885]: rust-lang/rust#67885 [68129]: rust-lang/rust#68129 [68672]: rust-lang/rust#68672 [68725]: rust-lang/rust#68725 [68728]: rust-lang/rust#68728 [68738]: rust-lang/rust#68738 [68742]: rust-lang/rust#68742 [68764]: rust-lang/rust#68764 [68772]: rust-lang/rust#68772 [68943]: rust-lang/rust#68943 [68952]: rust-lang/rust#68952 [68966]: rust-lang/rust#68966 [68984]: rust-lang/rust#68984 [69022]: rust-lang/rust#69022 [69185]: rust-lang/rust#69185 [69194]: rust-lang/rust#69194 [69201]: rust-lang/rust#69201 [69227]: rust-lang/rust#69227 [69548]: rust-lang/rust#69548 [69256]: rust-lang/rust#69256 [69361]: rust-lang/rust#69361 [69366]: rust-lang/rust#69366 [69538]: rust-lang/rust#69538 [cargo/7823]: rust-lang/cargo#7823 [cargo/7697]: rust-lang/cargo#7697 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html

rust-highfive assigned petrochenkov Feb 22, 2020

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macros can't interpolate impl items (or really parse them at all) #48137

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Centril force-pushed the unified-items branch from 8f215bf to 0564b71 Compare February 23, 2020 11:18

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Centril added 6 commits February 24, 2020 00:59

parser: tweak item kind wording

b01c1e2

parse: NtItem -> parse_item_common.

842027f

parse/ast: move Defaultness into variants.

62930d3

parse: tweak parse_item_ for more reuse.

e66a39b

parse: tweak diagnostic wordings

fde5939

parse: test bad variants wrt. issue 48137.

1c75f5a

Centril force-pushed the unified-items branch from d7f39d5 to 1c75f5a Compare February 24, 2020 00:11

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bors added the merged-by-bors This PR was explicitly merged by bors. label Feb 24, 2020

bors merged commit 79cd224 into rust-lang:master Feb 24, 2020

rust-highfive mentioned this pull request Feb 24, 2020

clippy-driver no longer builds after rust-lang/rust#69366 #69419

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JohnTitor added a commit to JohnTitor/rust-clippy that referenced this pull request Feb 24, 2020

Rustup to rust-lang/rust#69366

036ec5b

bors added a commit to rust-lang/rust-clippy that referenced this pull request Feb 24, 2020

Auto merge of #5221 - JohnTitor:rustup, r=phansch

fc5d0cc

Rustup to rust-lang/rust#69366 changelog: none

petrochenkov mentioned this pull request Feb 24, 2020

syntax: Remove Nt(Impl,Trait,Foreign)Item #69423

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Centril deleted the unified-items branch February 24, 2020 12:52

Centril mentioned this pull request Feb 24, 2020

EXPERIMENT: Recover on stmts/exprs at module level, suggesting to wrap in function #69445

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Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Feb 25, 2020

Rollup merge of rust-lang#69423 - petrochenkov:nont, r=Centril

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syntax: Remove `Nt(Impl,Trait,Foreign)Item` Follow-up to rust-lang#69366. r? @Centril

Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Feb 26, 2020

Rollup merge of rust-lang#69423 - petrochenkov:nont, r=Centril

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syntax: Remove `Nt(Impl,Trait,Foreign)Item` Follow-up to rust-lang#69366. r? @Centril

Centril mentioned this pull request Mar 30, 2020

Update for new stable and unstable features, and fix a few mistakes. rust-lang/wg-grammar#68

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petrochenkov mentioned this pull request Jan 14, 2021

Refactor token collection to capture trailing token immediately #81017

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parse: unify item parsing & filter illegal item kinds #69366

parse: unify item parsing & filter illegal item kinds #69366

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parse: unify item parsing & filter illegal item kinds #69366

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