Ensure Send/Sync is not implemented for std::env::Vars{,Os} - #155153

Mark-Simulacrum · 2026-04-11T13:41:15Z

On some platforms, it looks like these are not currently Send/Sync. We have a negative impl in env/common.rs. This is a breaking change on a bunch of targets, but it makes it less likely that someone unintentionally/accidentally depends on this. This is a potentially partial list but should be fairly complete. These are all platforms where these previously were unsupported, so this is relatively unlikely to actually break them.

aarch64-unknown-none, aarch64-unknown-none-softfloat, armv7a-none-eabi, armv7a-none-eabihf, armv7r-none-eabi, armv7r-none-eabihf, armv8r-none-eabihf, loongarch64-unknown-none,
loongarch64-unknown-none-softfloat, nvptx64-nvidia-cuda, riscv32i-unknown-none-elf, riscv32im-unknown-none-elf, riscv32imac-unknown-none-elf, riscv32imafc-unknown-none-elf, riscv32imc-unknown-none-elf, riscv64gc-unknown-none-elf, riscv64imac-unknown-none-elf, s390x-unknown-none-softfloat, thumbv6m-none-eabi, thumbv7a-none-eabi, thumbv7a-none-eabihf, thumbv7em-none-eabi, thumbv7em-none-eabihf, thumbv7m-none-eabi, thumbv7r-none-eabi, thumbv7r-none-eabihf, thumbv8m.base-none-eabi, thumbv8m.main-none-eabi, thumbv8m.main-none-eabihf, thumbv8r-none-eabihf, wasm32-unknown-unknown, wasm32v1-none, x86_64-unknown-none

cc #154517

On some platforms, it looks like these are not currently Send/Sync. We have a negative impl in env/common.rs. This is a breaking change on a bunch of targets, but it makes it less likely that someone unintentionally/accidentally depends on this. This is a potentially partial list but should be fairly complete: aarch64-unknown-none, aarch64-unknown-none-softfloat, armv7a-none-eabi, armv7a-none-eabihf, armv7r-none-eabi, armv7r-none-eabihf, armv8r-none-eabihf, loongarch64-unknown-none, loongarch64-unknown-none-softfloat, nvptx64-nvidia-cuda, riscv32i-unknown-none-elf, riscv32im-unknown-none-elf, riscv32imac-unknown-none-elf, riscv32imafc-unknown-none-elf, riscv32imc-unknown-none-elf, riscv64gc-unknown-none-elf, riscv64imac-unknown-none-elf, s390x-unknown-none-softfloat, thumbv6m-none-eabi, thumbv7a-none-eabi, thumbv7a-none-eabihf, thumbv7em-none-eabi, thumbv7em-none-eabihf, thumbv7m-none-eabi, thumbv7r-none-eabi, thumbv7r-none-eabihf, thumbv8m.base-none-eabi, thumbv8m.main-none-eabi, thumbv8m.main-none-eabihf, thumbv8r-none-eabihf, wasm32-unknown-unknown, wasm32v1-none, x86_64-unknown-none

rustbot · 2026-04-11T14:05:46Z

@Mark-Simulacrum: no appropriate reviewer found, use r? to override

Amanieu · 2026-04-14T17:34:17Z

@rfcbot merge libs-api

rust-rfcbot · 2026-04-14T17:34:29Z

Team member @Amanieu has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

Mark-Simulacrum · 2026-04-16T02:19:32Z

Just to clarify @nia-e since I see in the meeting notes, in case it affects anyone's FCP box:

Nia: This one is trickier because it's removing a negative impl.

This is not removing a negative impl, it's adding that negative impl to all targets by moving it out of sys/ and into the public type's API.

rust-rfcbot · 2026-05-03T02:42:56Z

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

rust-rfcbot · 2026-05-13T02:51:11Z

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.

Mark-Simulacrum · 2026-06-11T01:53:07Z

r? libs

clarfonthey · 2026-06-11T02:23:59Z

Code review: yes, looks like code

@bors r+ rollup

rust-bors · 2026-06-11T02:24:02Z

📌 Commit 603b80f has been approved by clarfonthey

It is now in the queue for this repository.

…nthey Ensure Send/Sync is not implemented for std::env::Vars{,Os} On some platforms, it looks like these are not currently Send/Sync. We have a negative impl in env/common.rs. This is a breaking change on a bunch of targets, but it makes it less likely that someone unintentionally/accidentally depends on this. This is a potentially partial list but should be fairly complete. These are all platforms where these previously were [unsupported](https://github.com/rust-lang/rust/blob/main/library/std/src/sys/env/unsupported.rs), so this is relatively unlikely to actually break them. aarch64-unknown-none, aarch64-unknown-none-softfloat, armv7a-none-eabi, armv7a-none-eabihf, armv7r-none-eabi, armv7r-none-eabihf, armv8r-none-eabihf, loongarch64-unknown-none, loongarch64-unknown-none-softfloat, nvptx64-nvidia-cuda, riscv32i-unknown-none-elf, riscv32im-unknown-none-elf, riscv32imac-unknown-none-elf, riscv32imafc-unknown-none-elf, riscv32imc-unknown-none-elf, riscv64gc-unknown-none-elf, riscv64imac-unknown-none-elf, s390x-unknown-none-softfloat, thumbv6m-none-eabi, thumbv7a-none-eabi, thumbv7a-none-eabihf, thumbv7em-none-eabi, thumbv7em-none-eabihf, thumbv7m-none-eabi, thumbv7r-none-eabi, thumbv7r-none-eabihf, thumbv8m.base-none-eabi, thumbv8m.main-none-eabi, thumbv8m.main-none-eabihf, thumbv8r-none-eabihf, wasm32-unknown-unknown, wasm32v1-none, x86_64-unknown-none cc rust-lang#154517

Rollup of 31 pull requests Successful merges: - #141030 (Expand free alias types during variance computation) - #154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - #155527 (Replace printables table with `unicode_data.rs` tables) - #156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - #157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - #157282 (Fix post-monomorphization error note race in the parallel frontend) - #157352 (Make the retained dep graph deterministic under the parallel frontend) - #157601 (Emit error for unused target expression in glob and list delegations) - #157611 (Update `browser-ui-test` version to `0.24.0`) - #157620 (Add a strategy FnMut to inject behavior into the flush cycle) - #157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - #157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - #157647 (Start using comptime for reflection intrinsics and their wrapper functions) - #157719 (resolve: Partially revert "Remove a special case for dummy imports") - #155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - #155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - #155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - #156497 (fix-155516: Don't suggest wrong unwrap expect) - #156583 (Support defaults for static EIIs) - #157013 (Ensure inferred let pattern types are well-formed) - #157196 (Only suggest reborrowing a moved value where the reborrow is valid) - #157230 (borrowck: avoid ICE describing fields on generic params) - #157288 (platform support: add SNaN erratum to MIPS targets) - #157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - #157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - #157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - #157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - #157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - #157691 (Move symbol hiding code to a new file) - #157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - #157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - #157699 (Arg splat experiment - hir FnDecl impl)

Rollup merge of #155153 - Mark-Simulacrum:env-vars, r=clarfonthey Ensure Send/Sync is not implemented for std::env::Vars{,Os} On some platforms, it looks like these are not currently Send/Sync. We have a negative impl in env/common.rs. This is a breaking change on a bunch of targets, but it makes it less likely that someone unintentionally/accidentally depends on this. This is a potentially partial list but should be fairly complete. These are all platforms where these previously were [unsupported](https://github.com/rust-lang/rust/blob/main/library/std/src/sys/env/unsupported.rs), so this is relatively unlikely to actually break them. aarch64-unknown-none, aarch64-unknown-none-softfloat, armv7a-none-eabi, armv7a-none-eabihf, armv7r-none-eabi, armv7r-none-eabihf, armv8r-none-eabihf, loongarch64-unknown-none, loongarch64-unknown-none-softfloat, nvptx64-nvidia-cuda, riscv32i-unknown-none-elf, riscv32im-unknown-none-elf, riscv32imac-unknown-none-elf, riscv32imafc-unknown-none-elf, riscv32imc-unknown-none-elf, riscv64gc-unknown-none-elf, riscv64imac-unknown-none-elf, s390x-unknown-none-softfloat, thumbv6m-none-eabi, thumbv7a-none-eabi, thumbv7a-none-eabihf, thumbv7em-none-eabi, thumbv7em-none-eabihf, thumbv7m-none-eabi, thumbv7r-none-eabi, thumbv7r-none-eabihf, thumbv8m.base-none-eabi, thumbv8m.main-none-eabi, thumbv8m.main-none-eabihf, thumbv8r-none-eabihf, wasm32-unknown-unknown, wasm32v1-none, x86_64-unknown-none cc #154517

Rollup of 31 pull requests Successful merges: - rust-lang#141030 (Expand free alias types during variance computation) - rust-lang#154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - rust-lang#155527 (Replace printables table with `unicode_data.rs` tables) - rust-lang#156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - rust-lang#157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - rust-lang#157282 (Fix post-monomorphization error note race in the parallel frontend) - rust-lang#157352 (Make the retained dep graph deterministic under the parallel frontend) - rust-lang#157601 (Emit error for unused target expression in glob and list delegations) - rust-lang#157611 (Update `browser-ui-test` version to `0.24.0`) - rust-lang#157620 (Add a strategy FnMut to inject behavior into the flush cycle) - rust-lang#157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - rust-lang#157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - rust-lang#157647 (Start using comptime for reflection intrinsics and their wrapper functions) - rust-lang#157719 (resolve: Partially revert "Remove a special case for dummy imports") - rust-lang#155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - rust-lang#155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - rust-lang#155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - rust-lang#156497 (fix-155516: Don't suggest wrong unwrap expect) - rust-lang#156583 (Support defaults for static EIIs) - rust-lang#157013 (Ensure inferred let pattern types are well-formed) - rust-lang#157196 (Only suggest reborrowing a moved value where the reborrow is valid) - rust-lang#157230 (borrowck: avoid ICE describing fields on generic params) - rust-lang#157288 (platform support: add SNaN erratum to MIPS targets) - rust-lang#157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - rust-lang#157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - rust-lang#157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - rust-lang#157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - rust-lang#157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - rust-lang#157691 (Move symbol hiding code to a new file) - rust-lang#157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - rust-lang#157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - rust-lang#157699 (Arg splat experiment - hir FnDecl impl)

Rollup of 31 pull requests Successful merges: - rust-lang/rust#141030 (Expand free alias types during variance computation) - rust-lang/rust#154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - rust-lang/rust#155527 (Replace printables table with `unicode_data.rs` tables) - rust-lang/rust#156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - rust-lang/rust#157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - rust-lang/rust#157282 (Fix post-monomorphization error note race in the parallel frontend) - rust-lang/rust#157352 (Make the retained dep graph deterministic under the parallel frontend) - rust-lang/rust#157601 (Emit error for unused target expression in glob and list delegations) - rust-lang/rust#157611 (Update `browser-ui-test` version to `0.24.0`) - rust-lang/rust#157620 (Add a strategy FnMut to inject behavior into the flush cycle) - rust-lang/rust#157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - rust-lang/rust#157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - rust-lang/rust#157647 (Start using comptime for reflection intrinsics and their wrapper functions) - rust-lang/rust#157719 (resolve: Partially revert "Remove a special case for dummy imports") - rust-lang/rust#155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - rust-lang/rust#155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - rust-lang/rust#155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - rust-lang/rust#156497 (fix-155516: Don't suggest wrong unwrap expect) - rust-lang/rust#156583 (Support defaults for static EIIs) - rust-lang/rust#157013 (Ensure inferred let pattern types are well-formed) - rust-lang/rust#157196 (Only suggest reborrowing a moved value where the reborrow is valid) - rust-lang/rust#157230 (borrowck: avoid ICE describing fields on generic params) - rust-lang/rust#157288 (platform support: add SNaN erratum to MIPS targets) - rust-lang/rust#157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - rust-lang/rust#157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - rust-lang/rust#157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - rust-lang/rust#157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - rust-lang/rust#157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - rust-lang/rust#157691 (Move symbol hiding code to a new file) - rust-lang/rust#157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - rust-lang/rust#157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - rust-lang/rust#157699 (Arg splat experiment - hir FnDecl impl)

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [rust](https://github.com/rust-lang/rust) | tools | minor | `1.97.1` → `1.98.0` | 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> ### [`v1.98.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1980-2026-08-20) [Compare Source](rust-lang/rust@1.97.1...1.98.0) \========================== <a id="1.98.0-Language"></a> ## Language - [Allow shortening lifetime of `&mut` when unsize-coercing, even in an invariant position.](rust-lang/rust#149219) For example, you can now coerce a `Cell<&'long mut i32>` to a `Cell<&'short mut dyn Send>`. Such shortenings were already previously allowed when coercing a `&mut` to a `&`, or coercing a `&` to a `&`. - [Add deny-by-default `invalid_runtime_symbol_definitions` lint and warn-by-default `suspicious_runtime_symbol_definitions` lint](rust-lang/rust#155521) - The lints currently specifically targets `core` runtime symbols like `memcmp`, `memset`, `strlen`, ... and is planned to be expanded in the next few releases. - [Add warn-by-default `c_void_returns` lint to check `core::ffi::c_void` as a return type](rust-lang/rust#156379) <a id="1.98.0-Platform-Support"></a> ## Platform Support - [Add `powerpc64-unknown-linux-gnuelfv2` as Tier 3](rust-lang/rust#144220) - [Add `aarch64-unknown-linux-pauthtest` as Tier 3 target](rust-lang/rust#155722) - [Promote `thumbv7a-none-eabi` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv7a-none-eabihf` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv7r-none-eabi` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv7r-none-eabihf` to Tier 2](rust-lang/rust#155763) - [Promote `thumbv8r-none-eabihf` to Tier 2](rust-lang/rust#155763) 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="1.98.0-Libraries"></a> ## Libraries - [Change `Location<'_>` lifetime to `'static` in `Panic[Hook]Info`](rust-lang/rust#146561) - [Document panic in `RangeInclusive::from(legacy::RangeInclusive)`](rust-lang/rust#155421) - [Document that `ManuallyDrop`'s `Box` interaction has been fixed](rust-lang/rust#155750) - [Stabilize LoongArch CRC Intrinsics](rust-lang/rust#156908) - [The `derive` macro is available at `{core,std}::derive`.](rust-lang/rust#154645) This was previously [unintentionally stabilized in 1.96](rust-lang/rust#159856), but is now [explicitly accepted](rust-lang/rust#154645) as a stabilized API. - Please note that the MSRV for `{core,std}::derive` will be 1.96, and not 1.98. <a id="1.98.0-Stabilized-APIs"></a> ## Stabilized APIs - [`str::substr_range`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.substr_range) - [`[T]::subslice_range`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.subslice_range) - [`core::fmt::NumBuffer`](https://doc.rust-lang.org/stable/core/fmt/struct.NumBuffer.html) - [`<{integer}>::format_into`](https://doc.rust-lang.org/stable/core/primitive.usize.html#method.format_into) - [`Send/Sync for std::process::CommandArgs`](https://doc.rust-lang.org/stable/std/process/struct.CommandArgs.html#impl-Send-for-CommandArgs%3C'a%3E) - [`{fN}::algebraic_add`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_add) - [`{fN}::algebraic_sub`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_sub) - [`{fN}::algebraic_mul`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_mul) - [`{fN}::algebraic_div`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_div) - [`{fN}::algebraic_rem`](https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_rem) - [`NonZero<{integer}>::from_str_radix`](https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#method.from_str_radix-4) - [`String::from_utf16le`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le) - [`String::from_utf16le_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le_lossy) - [`String::from_utf16be`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be) - [`String::from_utf16be_lossy`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be_lossy) - [`[T]::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.slice.html#method.strip_circumfix) - [`str::strip_circumfix`](https://doc.rust-lang.org/stable/core/primitive.str.html#method.strip_circumfix) - [`Atomic<T>::from_mut`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut) - [`Atomic<T>::get_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice) - [`Atomic<T>::from_mut_slice`](https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut_slice) - [`std::range::legacy`](https://doc.rust-lang.org/stable/std/range/legacy/index.html) <a id="1.98.0-Compatibility-Notes"></a> ## Compatibility Notes - [If fully elided, lifetime bounds of trait object types may now resolve differently or even get rejected in very specific niche scenarios](rust-lang/rust#129543) - [Error in more cases of ambiguous imports](rust-lang/rust#145108) - [Switch the destructors implementation for thread locals on Windows to use Fiber Local Storage (FLS)](rust-lang/rust#148799) - [Convert some cases of the `ambiguous_glob_imports` lint into a hard error](rust-lang/rust#149195) - [Where-bounds of the form `Type = Type` and `Type == Type` are no longer syntactically allowed](rust-lang/rust#153513) - [Ensure Send/Sync is not implemented for std::env::Vars{,Os}](rust-lang/rust#155153) - [Fix that in some attributes, arguments were not properly rejected](rust-lang/rust#155193) - [`repr(transparent)` is now more strict about which fields have "trivial" layout and hence can be ignored: `repr(C)` types, types with private fields, and `#[non_exhaustive]` types are no longer considered "trivial"](rust-lang/rust#155299) - [Correctly check whether types have equal size in `transmute()` when some `repr` attributes are involved.](rust-lang/rust#155418) - [More characters are escaped when printing strings and chars](rust-lang/rust#155527) - [Implement fast path for `derive(PartialOrd)` when deriving `Ord`](rust-lang/rust#155598) This can break crates in practice where a type's PartialOrd and Ord impls were inconsistent with each other. - [Add temporary scope to `assert_eq` and `assert_ne`](rust-lang/rust#155739) - Closed a hole in the pattern matching [structural equality](https://doc.rust-lang.org/reference/patterns.html#constant-patterns) check, preventing cases where a match of a constant would be allowed, despite disagreeing with a manually written `PartialEq` implementation, when a `derive(PartialEq)` implementation for that type also exists. - [On Emscripten the WASM exception handling ABI is now unconditionally used](rust-lang/rust#156928) The `-Zemscripten-wasm-eh=false` flag to switch back to JS exceptions has been removed. - [The UNSAFE\_CODE lint is now consistently emitted for all unsafe attributes](rust-lang/rust#157201) - [Solaris: remove `File::lock` implementation, it has the wrong semantics (return "unsupported" instead)](rust-lang/rust#157509) - [Windows-gnu targets now specify baseline tools versions](rust-lang/rust#158020) - [rustfmt now discovers module files that are defined in `cfg_select!`](rust-lang/rust#158372) This may cause more code to be formatted which was previously ignored. </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. 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Pkgsrc changes: * Update patches to match new vendored versions. * Associated checksum changes. * Add cargo option to permit linker warnings (NetBSD compat code) (taken from rust-beta wip package) Upstream changes: Version 1.98.0 (2026-08-20) ========================== Language -------- - [Allow shortening lifetime of `&mut` when unsize-coercing, even in an invariant position.] (rust-lang/rust#149219) For example, you can now coerce a `Cell<&'long mut i32>` to a `Cell<&'short mut dyn Send>`. Such shortenings were already previously allowed when coercing a `&mut` to a `&`, or coercing a `&` to a `&`. - [Add deny-by-default `invalid_runtime_symbol_definitions` lint and warn-by-default `suspicious_runtime_symbol_definitions` lint] (rust-lang/rust#155521) - The lints currently specifically targets `core` runtime symbols like `memcmp`, `memset`, `strlen`, ... and is planned to be expanded in the next few releases. - [Add warn-by-default `c_void_returns` lint to check `core::ffi::c_void` as a return type] (rust-lang/rust#156379) Platform Support ---------------- - [Add `powerpc64-unknown-linux-gnuelfv2` as Tier 3] (rust-lang/rust#144220) - [Add `aarch64-unknown-linux-pauthtest` as Tier 3 target] (rust-lang/rust#155722) - [Promote `thumbv7a-none-eabi` to Tier 2] (rust-lang/rust#155763) - [Promote `thumbv7a-none-eabihf` to Tier 2] (rust-lang/rust#155763) - [Promote `thumbv7r-none-eabi` to Tier 2] (rust-lang/rust#155763) - [Promote `thumbv7r-none-eabihf` to Tier 2] (rust-lang/rust#155763) - [Promote `thumbv8r-none-eabihf` to Tier 2] (rust-lang/rust#155763) 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 Libraries --------- - [Change `Location<'_>` lifetime to `'static` in `Panic[Hook]Info`] (rust-lang/rust#146561) - [Document panic in `RangeInclusive::from(legacy::RangeInclusive)`] (rust-lang/rust#155421) - [Document that `ManuallyDrop`'s `Box` interaction has been fixed] (rust-lang/rust#155750) - [Stabilize LoongArch CRC Intrinsics] (rust-lang/rust#156908) - [The `derive` macro is available at `{core,std}::derive`.] (rust-lang/rust#154645) This was previously [unintentionally stabilized in 1.96] (rust-lang/rust#159856), but is now [explicitly accepted] (rust-lang/rust#154645) as a stabilized API. - Please note that the MSRV for `{core,std}::derive` will be 1.96, and not 1.98. Stabilized APIs --------------- - [`str::substr_range`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.substr_range) - [`[T]::subslice_range`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.subslice_range) - [`core::fmt::NumBuffer`] (https://doc.rust-lang.org/stable/core/fmt/struct.NumBuffer.html) - [`<{integer}>::format_into`] (https://doc.rust-lang.org/stable/core/primitive.usize.html#method.format_into) - [`Send/Sync for std::process::CommandArgs`] (https://doc.rust-lang.org/stable/std/process/struct.CommandArgs.html#impl-Send-for-CommandArgs%3C'a%3E) - [`{fN}::algebraic_add`] (https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_add) - [`{fN}::algebraic_sub`] (https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_sub) - [`{fN}::algebraic_mul`] (https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_mul) - [`{fN}::algebraic_div`] (https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_div) - [`{fN}::algebraic_rem`] (https://doc.rust-lang.org/stable/core/primitive.f32.html#method.algebraic_rem) - [`NonZero<{integer}>::from_str_radix`] (https://doc.rust-lang.org/stable/core/num/struct.NonZero.html#method.from_str_radix-4) - [`String::from_utf16le`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le) - [`String::from_utf16le_lossy`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16le_lossy) - [`String::from_utf16be`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be) - [`String::from_utf16be_lossy`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf16be_lossy) - [`[T]::strip_circumfix`] (https://doc.rust-lang.org/stable/core/primitive.slice.html#method.strip_circumfix) - [`str::strip_circumfix`] (https://doc.rust-lang.org/stable/core/primitive.str.html#method.strip_circumfix) - [`Atomic<T>::from_mut`] (https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut) - [`Atomic<T>::get_mut_slice`] (https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.get_mut_slice) - [`Atomic<T>::from_mut_slice`] (https://doc.rust-lang.org/stable/core/sync/atomic/struct.Atomic.html#method.from_mut_slice) - [`std::range::legacy`] (https://doc.rust-lang.org/stable/std/range/legacy/index.html) Compatibility Notes ------------------- - [If fully elided, lifetime bounds of trait object types may now resolve differently or even get rejected in very specific niche scenarios] (rust-lang/rust#129543) - [Error in more cases of ambiguous imports] (rust-lang/rust#145108) - [Switch the destructors implementation for thread locals on Windows to use Fiber Local Storage (FLS)] (rust-lang/rust#148799) - [Convert some cases of the `ambiguous_glob_imports` lint into a hard error] (rust-lang/rust#149195) - [Where-bounds of the form `Type = Type` and `Type == Type` are no longer syntactically allowed] (rust-lang/rust#153513) - [Ensure Send/Sync is not implemented for std::env::Vars{,Os}] (rust-lang/rust#155153) - [Fix that in some attributes, arguments were not properly rejected] (rust-lang/rust#155193) - [`repr(transparent)` is now more strict about which fields have "trivial" layout and hence can be ignored: `repr(C)` types, types with private fields, and `#[non_exhaustive]` types are no longer considered "trivial"] (rust-lang/rust#155299) - [Correctly check whether types have equal size in `transmute()` when some `repr` attributes are involved.] (rust-lang/rust#155418) - [More characters are escaped when printing strings and chars] (rust-lang/rust#155527) - [Implement fast path for `derive(PartialOrd)` when deriving `Ord`] (rust-lang/rust#155598) This can break crates in practice where a type's PartialOrd and Ord impls were inconsistent with each other. - [Add temporary scope to `assert_eq` and `assert_ne`] (rust-lang/rust#155739) - Closed a hole in the pattern matching [structural equality] (https://doc.rust-lang.org/reference/patterns.html#constant-patterns) check, preventing cases where a match of a constant would be allowed, despite disagreeing with a manually written `PartialEq` implementation, when a `derive(PartialEq)` implementation for that type also exists. - [On Emscripten the WASM exception handling ABI is now unconditionally used] (rust-lang/rust#156928) The `-Zemscripten-wasm-eh=false` flag to switch back to JS exceptions has been removed. - [The UNSAFE_CODE lint is now consistently emitted for all unsafe attributes] (rust-lang/rust#157201) - [Solaris: remove `File::lock` implementation, it has the wrong semantics (return "unsupported" instead)] (rust-lang/rust#157509) - [Windows-gnu targets now specify baseline tools versions] (rust-lang/rust#158020) - [rustfmt now discovers module files that are defined in `cfg_select!`] (rust-lang/rust#158372) This may cause more code to be formatted which was previously ignored.

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Tracking issue for release notes of #155153: Ensure Send/Sync is not implemented for std::env::Vars{,Os} #156521

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rustbot added the T-libs Relevant to the library team, which will review and decide on the PR/issue. label Jun 11, 2026

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rust-bors Bot 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 Jun 11, 2026

jhpratt mentioned this pull request Jun 11, 2026

Rollup of 28 pull requests #157735

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jhpratt mentioned this pull request Jun 11, 2026

Rollup of 31 pull requests #157739

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rust-bors Bot merged commit 5bba0b9 into rust-lang:main Jun 11, 2026
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BoxyUwU mentioned this pull request Aug 7, 2026

Draft release notes for 1.98.0 #160700

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Mark-Simulacrum mentioned this pull request Sep 8, 2026

Make std::fs::{File, ReadDir, DirEntry} always needs_drop even when unsupported. #162444

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clarfonthey added the A-env Area: `std::env` (note: `std::process` is A-process) label Nov 4, 2026

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Ensure Send/Sync is not implemented for std::env::Vars{,Os} - #155153

Ensure Send/Sync is not implemented for std::env::Vars{,Os}#155153
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