Fix parsing of ranges after unary operators #134900

dtolnay · 2024-12-29T19:09:42Z

This PR aligns the parsing for unary ! and - and * with how unary & is already parsed here.

--- stderr ------------------------------- error: expected expression, found `..` --> tests/ui/parser/ranges-precedence.rs:75:12 | LL | ($e:expr) => {}; | ------- while parsing argument for this `expr` macro fragment LL | } LL | expr!(!..0); | ^^ expected expression error: expected expression, found `..` --> tests/ui/parser/ranges-precedence.rs:76:12 | LL | ($e:expr) => {}; | ------- while parsing argument for this `expr` macro fragment ... LL | expr!(-..0); | ^^ expected expression error: expected expression, found `..` --> tests/ui/parser/ranges-precedence.rs:77:12 | LL | ($e:expr) => {}; | ------- while parsing argument for this `expr` macro fragment ... LL | expr!(*..0); | ^^ expected expression error: aborting due to 3 previous errors ------------------------------------------

rustbot · 2024-12-29T19:09:50Z

r? @lcnr

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tests/ui/parser/ranges-precedence.rs

jieyouxu · 2024-12-30T10:58:32Z

r? parser (this is likely accepting new code or re-accepting code that regressed a while ago)

compiler-errors

Implementation looks fine and this does align with the approach that the & operator takes. Funny enough that was implemented in #105701, and it never went through an FCP even though it was tagged as such, and obviously changes the set of parsed expressions in a way that makes new guarantees to the grammar (at least effectively? not certain if the grammar in the reference suggests that should be parsed, and I don't really want to look).

I think this is both clearly a T-lang signoff but also trivial and desirable to make, so r=me after that is approved. They also should perhaps retroactively be aware that we began to allow &.. too in 1.68.

oli-obk · 2025-02-05T19:25:42Z

Should we crater this for the macro fragment effects this may theoretically have? Even if just to tell folk that their code needs fixing before this hits stable.

dtolnay · 2025-02-05T23:49:32Z

@bors try

dtolnay · 2025-02-05T23:58:48Z

@bors ping

bors · 2025-02-05T23:58:51Z

😪 I'm awake I'm awake

bors · 2025-02-06T00:00:13Z

⌛ Trying commit 462604d with merge 64628e5...

Fix parsing of ranges after unary operators Fixes rust-lang#134899. This PR aligns the parsing for unary `!` and `-` and `*` with how unary `&` is already parsed [here](https://github.com/rust-lang/rust/blob/5c0a6e68cfdad859615c2888de76505f13e6f01b/compiler/rustc_parse/src/parser/expr.rs#L848-L854).

bors · 2025-02-06T01:49:41Z

☀️ Try build successful - checks-actions
Build commit: 64628e5 (64628e57ec7d61fad21c958209d4b2ee40a934d1)

nikomatsakis · 2025-02-19T16:57:34Z

@rfcbot resolve +-operator

Ah, I think I see why now, because we don't treat + as an operator, we just special case the +-literal. I'm gonna resolve my concern for now.

rfcbot · 2025-02-19T16:57:45Z

🔔 This is now entering its final comment period, as per the review above. 🔔

rfcbot · 2025-03-01T17:01:18Z

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

This will be merged soon.

dtolnay · 2025-03-01T18:36:12Z

@bors r=compiler-errors,davidtwco
compiler-errors: #134900 (review)
davidtwco: #134900 (review)

bors · 2025-03-01T18:36:15Z

📌 Commit 462604d has been approved by compiler-errors,davidtwco

It is now in the queue for this repository.

…rs,davidtwco Fix parsing of ranges after unary operators Fixes rust-lang#134899. This PR aligns the parsing for unary `!` and `-` and `*` with how unary `&` is already parsed [here](https://github.com/rust-lang/rust/blob/5c0a6e68cfdad859615c2888de76505f13e6f01b/compiler/rustc_parse/src/parser/expr.rs#L848-L854).

…iaskrgr Rollup of 10 pull requests Successful merges: - rust-lang#132388 (Implement `#[cfg]` in `where` clauses) - rust-lang#134900 (Fix parsing of ranges after unary operators) - rust-lang#136938 (Remove `:` from `stack-protector-heuristics-effect.rs` Filecheck Pattern) - rust-lang#137054 (Make phantom variance markers transparent) - rust-lang#137525 (Simplify parallelization in test-float-parse) - rust-lang#137618 (Skip `tidy` in pre-push hook if the user is deleting a remote branch) - rust-lang#137685 (self-contained linker: conservatively default to `-znostart-stop-gc`) - rust-lang#137741 (Stop using `hash_raw_entry` in `CodegenCx::const_str`) - rust-lang#137849 (Revert "Remove Win SDK 10.0.26100.0 from CI") - rust-lang#137862 (ensure we always print all --print options in help) r? `@ghost` `@rustbot` modify labels: rollup

…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#132388 (Implement `#[cfg]` in `where` clauses) - rust-lang#134900 (Fix parsing of ranges after unary operators) - rust-lang#136938 (Remove `:` from `stack-protector-heuristics-effect.rs` Filecheck Pattern) - rust-lang#137054 (Make phantom variance markers transparent) - rust-lang#137525 (Simplify parallelization in test-float-parse) - rust-lang#137618 (Skip `tidy` in pre-push hook if the user is deleting a remote branch) - rust-lang#137741 (Stop using `hash_raw_entry` in `CodegenCx::const_str`) - rust-lang#137849 (Revert "Remove Win SDK 10.0.26100.0 from CI") - rust-lang#137862 (ensure we always print all --print options in help) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#134900 - dtolnay:unoprange, r=compiler-errors,davidtwco Fix parsing of ranges after unary operators Fixes rust-lang#134899. This PR aligns the parsing for unary `!` and `-` and `*` with how unary `&` is already parsed [here](https://github.com/rust-lang/rust/blob/5c0a6e68cfdad859615c2888de76505f13e6f01b/compiler/rustc_parse/src/parser/expr.rs#L848-L854).

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.86.0` -> `1.87.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.87.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1870-2025-05-15) [Compare Source](rust-lang/rust@1.86.0...1.87.0) \========================== <a id="1.87.0-Language"></a> ## Language - [Stabilize `asm_goto` feature](rust-lang/rust#133870) - [Allow parsing open beginning ranges (`..EXPR`) after unary operators `!`, `-`, and `*`](rust-lang/rust#134900). - [Don't require method impls for methods with `Self: Sized` bounds in `impl`s for unsized types](rust-lang/rust#135480) - [Stabilize `feature(precise_capturing_in_traits)` allowing `use<...>` bounds on return position `impl Trait` in `trait`s](rust-lang/rust#138128) <a id="1.87.0-Compiler"></a> ## Compiler - [x86: make SSE2 required for i686 targets and use it to pass SIMD types](rust-lang/rust#135408) <a id="1.87.0-Platform-Support"></a> ## Platform Support - [Remove `i586-pc-windows-msvc` target](rust-lang/rust#137957) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html <a id="1.87.0-Libraries"></a> ## Libraries - [Stabilize the anonymous pipe API](rust-lang/rust#127154) - [Add support for unbounded left/right shift operations](rust-lang/rust#129375) - [Print pointer metadata in `Debug` impl of raw pointers](rust-lang/rust#135080) - [`Vec::with_capacity` guarantees it allocates with the amount requested, even if `Vec::capacity` returns a different number.](rust-lang/rust#135933) - Most `std::arch` intrinsics which don't take pointer arguments can now be called from safe code if the caller has the appropriate target features already enabled (rust-lang/stdarch#1714, rust-lang/stdarch#1716, rust-lang/stdarch#1717) - [Undeprecate `env::home_dir`](rust-lang/rust#137327) - [Denote `ControlFlow` as `#[must_use]`](rust-lang/rust#137449) - [Macros such as `assert_eq!` and `vec!` now support `const {...}` expressions](rust-lang/rust#138162) <a id="1.87.0-Stabilized-APIs"></a> ## Stabilized APIs - [`Vec::extract_if`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.extract_if) - [`vec::ExtractIf`](https://doc.rust-lang.org/stable/std/vec/struct.ExtractIf.html) - [`LinkedList::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.extract_if) - [`linked_list::ExtractIf`](https://doc.rust-lang.org/stable/std/collections/linked_list/struct.ExtractIf.html) - [`<[T]>::split_off`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off) - [`<[T]>::split_off_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_mut) - [`<[T]>::split_off_first`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first) - [`<[T]>::split_off_first_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first_mut) - [`<[T]>::split_off_last`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last) - [`<[T]>::split_off_last_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last_mut) - [`String::extend_from_within`](https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.extend_from_within) - [`os_str::Display`](https://doc.rust-lang.org/stable/std/ffi/os_str/struct.Display.html) - [`OsString::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.display) - [`OsStr::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.display) - [`io::pipe`](https://doc.rust-lang.org/stable/std/io/fn.pipe.html) - [`io::PipeReader`](https://doc.rust-lang.org/stable/std/io/struct.PipeReader.html) - [`io::PipeWriter`](https://doc.rust-lang.org/stable/std/io/struct.PipeWriter.html) - [`impl From<PipeReader> for OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeReader%3E-for-OwnedHandle) - [`impl From<PipeWriter> for OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeWriter%3E-for-OwnedHandle) - [`impl From<PipeReader> for Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html) - [`impl From<PipeWriter> for Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CPipeWriter%3E-for-Stdio) - [`impl From<PipeReader> for OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeReader%3E-for-OwnedFd) - [`impl From<PipeWriter> for OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeWriter%3E-for-OwnedFd) - [`Box<MaybeUninit<T>>::write`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.write) - [`impl TryFrom<Vec<u8>> for String`](https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-TryFrom%3CVec%3Cu8%3E%3E-for-String) - [`<*const T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned) - [`<*const T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned) - [`<*mut T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned-1) - [`<*mut T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned-1) - [`NonNull::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.offset_from_unsigned) - [`NonNull::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.byte_offset_from_unsigned) - [`<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.cast_signed) - [`NonZero::<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_signed-5). - [`<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.cast_unsigned). - [`NonZero::<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_unsigned-5). - [`<uN>::is_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.is_multiple_of) - [`<uN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shl) - [`<uN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shr) - [`<iN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shl) - [`<iN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shr) - [`<iN>::midpoint`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.midpoint) - [`<str>::from_utf8`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8) - [`<str>::from_utf8_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_mut) - [`<str>::from_utf8_unchecked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked) - [`<str>::from_utf8_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked_mut) These previously stable APIs are now stable in const contexts: - [`core::str::from_utf8_mut`](https://doc.rust-lang.org/stable/std/str/fn.from_utf8\_mut.html) - [`<[T]>::copy_from_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.copy_from_slice) - [`SocketAddr::set_ip`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_ip) - [`SocketAddr::set_port`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_port), - [`SocketAddrV4::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_ip) - [`SocketAddrV4::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_port), - [`SocketAddrV6::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_ip) - [`SocketAddrV6::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_port) - [`SocketAddrV6::set_flowinfo`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_flowinfo) - [`SocketAddrV6::set_scope_id`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_scope_id) - [`char::is_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) - [`char::is_whitespace`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_whitespace) - [`<[[T; N]]>::as_flattened`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened) - [`<[[T; N]]>::as_flattened_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened_mut) - [`String::into_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_bytes) - [`String::as_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_str) - [`String::capacity`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.capacity) - [`String::as_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_bytes) - [`String::len`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.len) - [`String::is_empty`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.is_empty) - [`String::as_mut_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_str) - [`String::as_mut_vec`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_vec) - [`Vec::as_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_ptr) - [`Vec::as_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_slice) - [`Vec::capacity`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.capacity) - [`Vec::len`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.len) - [`Vec::is_empty`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.is_empty) - [`Vec::as_mut_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_slice) - [`Vec::as_mut_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_ptr) <a id="1.87.0-Cargo"></a> ## Cargo - [Add terminal integration via ANSI OSC 9;4 sequences](rust-lang/cargo#14615) - [chore: bump openssl to v3](rust-lang/cargo#15232) - [feat(package): add --exclude-lockfile flag](rust-lang/cargo#15234) <a id="1.87.0-Compatibility-Notes"></a> ## Compatibility Notes - [Rust now raises an error for macro invocations inside the `#![crate_name]` attribute](rust-lang/rust#127581) - [Unstable fields are now always considered to be inhabited](rust-lang/rust#133889) - [Macro arguments of unary operators followed by open beginning ranges may now be matched differently](rust-lang/rust#134900) - [Make `Debug` impl of raw pointers print metadata if present](rust-lang/rust#135080) - [Warn against function pointers using unsupported ABI strings in dependencies](rust-lang/rust#135767) - [Associated types on `dyn` types are no longer deduplicated](rust-lang/rust#136458) - [Forbid attributes on `..` inside of struct patterns (`let Struct { #[attribute] .. }) =`](rust-lang/rust#136490) - [Make `ptr_cast_add_auto_to_object` lint into hard error](rust-lang/rust#136764) - Many `std::arch` intrinsics are now safe to call in some contexts, there may now be new `unused_unsafe` warnings in existing codebases. - [Limit `width` and `precision` formatting options to 16 bits on all targets](rust-lang/rust#136932) - [Turn order dependent trait objects future incompat warning into a hard error](rust-lang/rust#136968) - [Denote `ControlFlow` as `#[must_use]`](rust-lang/rust#137449) - [Windows: The standard library no longer links `advapi32`, except on win7.](rust-lang/rust#138233) Code such as C libraries that were relying on this assumption may need to explicitly link advapi32. - [Proc macros can no longer observe expanded `cfg(true)` attributes.](rust-lang/rust#138844) - [Start changing the internal representation of pasted tokens](rust-lang/rust#124141). Certain invalid declarative macros that were previously accepted in obscure circumstances are now correctly rejected by the compiler. Use of a `tt` fragment specifier can often fix these macros. - [Don't allow flattened format_args in const.](rust-lang/rust#139624) <a id="1.87.0-Internal-Changes"></a> ## Internal Changes These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 20](rust-lang/rust#135763) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

dtolnay added 2 commits December 29, 2024 11:03

Fix parsing of ranges after unary operators

462604d

rustbot assigned lcnr Dec 29, 2024

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Dec 29, 2024

dtolnay added the A-parser Area: The lexing & parsing of Rust source code to an AST label Dec 29, 2024

jieyouxu reviewed Dec 29, 2024

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ehuss mentioned this pull request Dec 31, 2024

Ensure all precedence rules are covered. rust-lang/reference#577

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Tracking issue for release notes of #134900: Fix parsing of ranges after unary operators #137859

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Rollup of 10 pull requests #137918

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Rollup of 9 pull requests #137927

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Draft release notes for 1.87 #140133

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compiler-errors left a comment •

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nikomatsakis commented Feb 19, 2025 •

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