Sourced from rust-toolchain's releases.

Rust 1.98.0

Language

• Allow shortening lifetime of &mut when unsize-coercing, even in an invariant position. 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
  • 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

Platform Support

• Add powerpc64-unknown-linux-gnuelfv2 as Tier 3
• Add aarch64-unknown-linux-pauthtest as Tier 3 target
• Promote thumbv7a-none-eabi to Tier 2
• Promote thumbv7a-none-eabihf to Tier 2
• Promote thumbv7r-none-eabi to Tier 2
• Promote thumbv7r-none-eabihf to Tier 2
• Promote thumbv8r-none-eabihf to Tier 2

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• Change Location<'_> lifetime to 'static in Panic[Hook]Info
• Document panic in RangeInclusive::from(legacy::RangeInclusive)
• Document that ManuallyDrop's Box interaction has been fixed
• Stabilize LoongArch CRC Intrinsics
• The derive macro is available at {core,std}::derive. This was previously unintentionally stabilized in 1.96, but is now explicitly accepted 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
• [T]::subslice_range
• core::fmt::NumBuffer
• <{integer}>::format_into
• Send/Sync for std::process::CommandArgs
• {fN}::algebraic_add
• {fN}::algebraic_sub
• {fN}::algebraic_mul
• {fN}::algebraic_div
• {fN}::algebraic_rem
• NonZero<{integer}>::from_str_radix

... (truncated)

Sourced from rust-toolchain's changelog.

Version 1.98.0 (2026-08-20)

Language

• Allow shortening lifetime of &mut when unsize-coercing, even in an invariant position. 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
  • 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

Platform Support

• Add powerpc64-unknown-linux-gnuelfv2 as Tier 3
• Add aarch64-unknown-linux-pauthtest as Tier 3 target
• Promote thumbv7a-none-eabi to Tier 2
• Promote thumbv7a-none-eabihf to Tier 2
• Promote thumbv7r-none-eabi to Tier 2
• Promote thumbv7r-none-eabihf to Tier 2
• Promote thumbv8r-none-eabihf to Tier 2

Refer to Rust's platform support page for more information on Rust's tiered platform support.

Libraries

• Change Location<'_> lifetime to 'static in Panic[Hook]Info
• Document panic in RangeInclusive::from(legacy::RangeInclusive)
• Document that ManuallyDrop's Box interaction has been fixed
• Stabilize LoongArch CRC Intrinsics
• The derive macro is available at {core,std}::derive. This was previously unintentionally stabilized in 1.96, but is now explicitly accepted 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
• [T]::subslice_range

... (truncated)

• 88d9e12 Auto merge of #161313 - cuviper:stable-next, r=cuviper
• 8f6f43c update relnotes
• c6d0dd0 Bump stable channel
• 824ef7e Revert "riscv: promote d, e, and f target_features to CfgStableToggleUnstable"
• 04eb0d7 Auto merge of #161039 - flip1995:clippy-beta-backport, r=Mark-Simulacrum
• 6cc2858 Fix ICE when resolving local in unnecessary_unwrap_unchecked (#17353)
• d440739 unnecessary_unwrap_unchecked: don't trigger inside the _unchecked fn (#17...
• e1114a1 Auto merge of #160714 - cuviper:beta-next, r=cuviper
• ebcacaa [beta-1.98] Update cargo submodule
• 33c0be1 Update attr name for #[unroll] in Unstable Book
• Additional commits viewable in compare view

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