encode `;` stmt without expr as `StmtKind::Empty` #69506

Centril · 2020-02-27T03:29:42Z

Instead of encoding ; statements without a an expression as a tuple in AST, encode it as ast::StmtKind::Empty.

r? @petrochenkov

Centril · 2020-02-27T03:30:09Z

Let's see whether this happens to regress perf: @bors try @rust-timer queue

rust-timer · 2020-02-27T03:30:10Z

Awaiting bors try build completion

bors · 2020-02-27T03:30:19Z

⌛ Trying commit fcea184 with merge 1d82a25...

@petrochenkov

encode `;` stmt without expr as `StmtKind::Semi(None)` Instead of encoding `;` statements without a an expression as a tuple in AST, we modify `ast::StmtKind::Semi` to accept an `Option<_>` and then encode the `;` with `StmtKind::Semi(None)`. r? @petrochenkov

bors · 2020-02-27T06:26:19Z

☀️ Try build successful - checks-azure
Build commit: 1d82a25 (1d82a2587146bc8a4282105545cd257ba2e3647b)

rust-timer · 2020-02-27T06:26:21Z

Queued 1d82a25 with parent 0c15adc, future comparison URL.

Centril · 2020-02-28T04:46:26Z

Seems like this resulted in a perf win rather than a regression, ostensibly because we avoid span_to_snippet.

petrochenkov · 2020-02-29T13:56:46Z

Let's make it a separate StmtKind instead.

The semicolon statement is subtly different from EXPR;, i.e. in the next example

macro_rules! empty { () => {} }

fn foo() -> u8 {
    { 0 }
    
    empty!();
}

empty!(); expands into a semicolon statement in the token-based expansion model (#61733), but { 0 } is still treated as a trailing return statement in this case.

The PR that turned redundant semicolons into statements in AST for diagnostics walked some dangerous road, I really hope it didn't introduce anything incompatible with the macro expansion plans.

src/test/ui/consts/const_let_eq.rs

Centril · 2020-02-29T14:06:07Z

Let's make it a separate StmtKind instead.

Hmm... Do you have any naming suggestions?

petrochenkov · 2020-02-29T14:11:02Z

I really hope it didn't introduce anything incompatible with the macro expansion plans.

It actually regressed some things, but it looks like it's possible to fix them backward-compatibly.

macro_rules! empty { () => {} }

fn foo() -> u8 {
    { 0 }
    
    empty!();; // Works on 1.38, error on 1.39
}

petrochenkov · 2020-02-29T14:16:31Z

Hmm... Do you have any naming suggestions?

Well.
StmtKind::Empty?

In C++ it's officially known as null statement, but I can't say I like that naming.

Centril · 2020-02-29T14:20:20Z

::Empty works for me; the other idea I had was ::Semi + ::SemiExpr(..) but ::Empty feels less like talking about lexical syntax, so it's nicer.

Centril · 2020-02-29T14:52:15Z

Changed to ::Empty and fixed the lint naming.

src/librustc_ast_lowering/lib.rs

src/test/ui/consts/const_let_eq.rs

src/librustc_ast_lowering/expr.rs

petrochenkov · 2020-02-29T15:25:37Z

r=me with the remaining nit addressed.

Centril · 2020-02-29T15:27:07Z

@bors r=petrochenkov

bors · 2020-02-29T15:27:09Z

📌 Commit 6a5de134879c7781a713d9b0d23a22aa5fdd5131 has been approved by petrochenkov

Centril · 2020-03-01T22:03:07Z

@bors r=petrochenkov

bors · 2020-03-01T22:03:08Z

📌 Commit 176fe3f has been approved by petrochenkov

bors · 2020-03-03T19:57:13Z

⌛ Testing commit 176fe3f with merge 4ad6248...

bors · 2020-03-03T23:26:32Z

☀️ Test successful - checks-azure
Approved by: petrochenkov
Pushing 4ad6248 to master...

rust-highfive · 2020-03-03T23:27:47Z

📣 Toolstate changed by #69506!

Tested on commit 4ad6248.
Direct link to PR: #69506

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

@mcarton

Tested on commit rust-lang/rust@4ad6248. Direct link to PR: <rust-lang/rust#69506> 💔 clippy-driver on windows: test-pass → test-fail (cc @mcarton @oli-obk @Manishearth @flip1995 @yaahc @phansch @llogiq). 💔 clippy-driver on linux: test-pass → test-fail (cc @mcarton @oli-obk @Manishearth @flip1995 @yaahc @phansch @llogiq).

Rustup to rust-lang/rust#69506 changelog: none

Changes: ```` Rustup to rust-lang#69506 Revive rls integration test use question mark operator Add regression test Use `try_eval_usize` over `eval_usize` Add path for display trait Use lang items instead of get_trait_def_id where possible Update stderr Don't lint debug formatting in debug impl Whitelist unused attribute for use items. add test for rust-lang#5238 ````

@oli-obk

submodules: update clippy from 8b7f7e6 to 74eae9d Changes: ```` Rustup to #69506 Revive rls integration test use question mark operator Add regression test Use `try_eval_usize` over `eval_usize` Add path for display trait Use lang items instead of get_trait_def_id where possible Update stderr Don't lint debug formatting in debug impl Whitelist unused attribute for use items. add test for #5238 ```` Makes clippy tests pass again. r? @oli-obk

Changes: ```` Apply suggestions from code review Simplify if_chain. Move NumericLiteral to its own module. Included binary and octal cases. Resolve false positives for hex int cast. Test for unnecessary_cast of hex int literal. run-rustfix Lint `if let Some` in question_mark lint Add restrictive pat use in full binded struct Update test case answers to match cargo dev fmt Ran cargo dev fmt Rustup to rust-lang#69506 Recommended changes from flip1995 Revive rls integration test use question mark operator Add regression test Use `try_eval_usize` over `eval_usize` Add path for display trait Use lang items instead of get_trait_def_id where possible Update stderr Don't lint debug formatting in debug impl Whitelist unused attribute for use items. Fix one last test issue Refactor suggested by krishna-veerareddy Fixed compile error from merging Changed test output to reflect cargo fmt Run cargo dev fmt Finished checking for cases of absolute values add test for rust-lang#5238 Some bugfixing Created floating point abs lint and test, but not yet run ````

@oli-obk

submodules: update clippy from 8b7f7e6 to 74eae9d Changes: ```` Rustup to #69506 Revive rls integration test use question mark operator Add regression test Use `try_eval_usize` over `eval_usize` Add path for display trait Use lang items instead of get_trait_def_id where possible Update stderr Don't lint debug formatting in debug impl Whitelist unused attribute for use items. add test for #5238 ```` Makes clippy tests pass again. r? @oli-obk

Changes: ```` Apply suggestions from code review Simplify if_chain. Move NumericLiteral to its own module. Included binary and octal cases. Resolve false positives for hex int cast. Test for unnecessary_cast of hex int literal. run-rustfix Lint `if let Some` in question_mark lint Add restrictive pat use in full binded struct Update test case answers to match cargo dev fmt Ran cargo dev fmt Rustup to rust-lang/rust#69506 Recommended changes from flip1995 Revive rls integration test use question mark operator Add regression test Use `try_eval_usize` over `eval_usize` Add path for display trait Use lang items instead of get_trait_def_id where possible Update stderr Don't lint debug formatting in debug impl Whitelist unused attribute for use items. Fix one last test issue Refactor suggested by krishna-veerareddy Fixed compile error from merging Changed test output to reflect cargo fmt Run cargo dev fmt Finished checking for cases of absolute values add test for rust-lang#5238 Some bugfixing Created floating point abs lint and test, but not yet run ````

rust-highfive assigned petrochenkov Feb 27, 2020

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Centril force-pushed the stmt-semi-none branch from fcea184 to d7291db Compare February 29, 2020 14:50

Centril changed the title ~~encode ; stmt without expr as StmtKind::Semi(None)~~ encode ; stmt without expr as StmtKind::Empty Feb 29, 2020

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Centril force-pushed the stmt-semi-none branch from d7291db to 7beba1f Compare February 29, 2020 15:21

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Centril force-pushed the stmt-semi-none branch from 7beba1f to 6a5de13 Compare February 29, 2020 15:26

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encode ; stmt w/o expr as StmtKind::Empty

176fe3f

Centril force-pushed the stmt-semi-none branch from 6a5de13 to 176fe3f Compare March 1, 2020 22:02

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 Mar 1, 2020

bors added the merged-by-bors This PR was explicitly merged by bors. label Mar 3, 2020

bors merged commit 4ad6248 into rust-lang:master Mar 3, 2020

This was referenced Mar 3, 2020

Permit attributes on 'if' expressions #69201

Merged

ast: Mac/Macro -> MacCall #69589

Merged

Centril deleted the stmt-semi-none branch March 3, 2020 23:51

flip1995 added a commit to flip1995/rust-clippy that referenced this pull request Mar 3, 2020

Rustup to rust-lang/rust#69506

a640696

bors added a commit to rust-lang/rust-clippy that referenced this pull request Mar 4, 2020

Auto merge of #5264 - flip1995:rustup, r=flip1995

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encode `;` stmt without expr as `StmtKind::Empty` #69506

encode `;` stmt without expr as `StmtKind::Empty` #69506

Centril commented Feb 27, 2020 •

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encode ; stmt without expr as StmtKind::Empty #69506

encode ; stmt without expr as StmtKind::Empty #69506

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encode `;` stmt without expr as `StmtKind::Empty` #69506

encode `;` stmt without expr as `StmtKind::Empty` #69506

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