Issues

• Copy-on-write mmap of dependency files commits their full size on Windows (os error 1455) since 1.78

  C-bugI-compilememI-prioritizeneeds-triageO-windowsregression-from-stable-to-stableT-compiler
  rust-lang/rust#164655 · Filter by author kurtkuehnert opened on Oct 20, 2026

• derived TrivialClone impl is unsound in the presence of impure macros

  A-macrosA-proc-macrosC-bugI-prioritizeI-unsoundT-langT-libs
  rust-lang/rust#164652 · Filter by author maxdexh opened on Oct 20, 2026
  1

• Tracking issue for boolean expressions in is_*_feature_detected!

  C-tracking-issueS-tracking-unimplementedT-libs
  rust-lang/rust#164651 · Filter by author malezjaa opened on Oct 20, 2026
  1

  

• Look for similar functions that might be available when encountering type mismatch on resolved fn call argument

  A-diagnosticsD-papercutD-terseP-lowT-compiler
  rust-lang/rust#164647 · Filter by author estebank opened on Oct 20, 2026

• Tracking issue for release notes of #164641: Stabilize slice_split_once

  relnotesrelnotes-needs-reviewrelnotes-tracking-issueT-libs
  rust-lang/rust#164642 · Filter by author rustbot opened on Oct 20, 2026

• RangeInclusive<T>.exhausted is set inconsistently

  A-iteratorsC-bugT-libs
  rust-lang/rust#164633 · Filter by author fs-rachel opened on Oct 20, 2026

• #[track_caller] is semver-incompatible due to importing as main

  A-crate-compatA-panicA-resolveA-runtimeC-bugT-compilerT-lang
  rust-lang/rust#164622 · Filter by author theemathas opened on Oct 20, 2026
  4

• [ICE]: index out of bounds in Generics::param_at when checking generic EII functions

  C-bugF-extern_item_implsI-ICET-compiler
  rust-lang/rust#164621 · Filter by author sososopy opened on Oct 20, 2026
  1

• rustc 1.90+ incorrectly reports necessary parentheses as unnecessary

  A-diagnosticsC-bugL-false-positiveregression-from-stable-to-stableT-compiler
  rust-lang/rust#164615 · Filter by author flying-kestrel opened on Oct 20, 2026

• [nightly] soundness: async_drop_in_place on a future suspended in an async drop drops a moved-out local again (double free)

  A-async-awaitA-destructorsC-bugF-async_dropI-unsoundT-compiler
  rust-lang/rust#164614 · Filter by author hazohelet opened on Oct 20, 2026
  1

• == and <= have different reborrowing behavior

  A-borrow-checkerA-closuresA-coercionsA-edition-2021A-MIRC-bugT-compilerT-langT-types
  rust-lang/rust#164610 · Filter by author Jules-Bertholet opened on Oct 20, 2026
  13

• rustc-LLVM ERROR: Unable to copy EFLAGS physical register! error when trying to compile program

  A-LLVMC-bugI-llvm-errorI-prioritizeregression-from-stable-to-stableS-has-bisectionS-has-mcveT-compiler
  rust-lang/rust#164603 · Filter by author qarmin opened on Oct 19, 2026
  7

• -Zlocation-detail can cause mismatched const values, leading to unsoundness

  A-const-evalA-const-genericsC-bugI-miscompileI-unsoundrequires-nightlyT-compiler
  rust-lang/rust#164601 · Filter by author clubby789 opened on Oct 19, 2026
  2

• ReferencePropagation incorrectly increases alignment of raw field loads

  A-mir-optC-bugI-miscompileI-prioritizeT-compiler
  rust-lang/rust#164599 · Filter by author YunusMutlu opened on Oct 19, 2026
  1

• Overlapping spans when implementing generic foreign trait for foreign type (E0117)

  A-diagnosticsD-non-disjoint-spansD-papercutT-compiler
  rust-lang/rust#164592 · Filter by author maxdexh opened on Oct 19, 2026
  3

  

• lldb_providers: &str summary reads the whole claimed length, so a bogus length hangs the debugger and exhausts memory

  A-debuggersA-debuggers-lldbC-bugWG-debugging
  rust-lang/rust#164588 · Filter by author SiddharthPant opened on Oct 19, 2026
  1

  

• Rustc can't handle non-UTF-8 input paths, but only when RUST_BACKTRACE is not set

  A-driverA-UnicodeC-bugI-crashT-compiler
  rust-lang/rust#164585 · Filter by author theemathas opened on Oct 19, 2026
  9

• [ICE]: aarch64-unknown-linux-gnu segfault in llvm

  A-LLVMC-bugI-crashI-llvm-errorI-prioritizellvm-fixed-upstreamregression-from-stable-to-stableT-compiler
  rust-lang/rust#164584 · Filter by author Firestar99 opened on Oct 19, 2026
  6

  

• Error message from using a path to a non-exported macro_rules! should mention/suggest exporting

  A-diagnosticsA-macrosD-lack-of-suggestionD-newcomer-roadblockT-compiler
  rust-lang/rust#164580 · Filter by author ts826848 opened on Oct 19, 2026
  1

• Inconsistent Location::caller() const-evaluation across crates due to tab expansion

  A-const-evalA-const-genericsA-cratesA-panicC-bugI-ICEI-miscompileI-unsoundP-highregression-from-stable-to-stableS-has-bisectionT-compilerT-libs
  rust-lang/rust#164574 · Filter by author jsnell opened on Oct 19, 2026
  13

• [ICE]: can't type-check body of DefId when borrow-checking a const expression in an array length

  A-borrow-checkerA-const-evalC-bugI-ICEP-mediumregression-from-stable-to-stableS-has-bisectionT-compilerT-types
  rust-lang/rust#164572 · Filter by author sososopy opened on Oct 19, 2026
  3

• export_name on provided trait associated functions has funny behavior

  A-attributesA-codegenA-linkersA-mir-optC-bugI-prioritizeregression-from-stable-to-stableS-has-bisectionT-compilerT-lang
  rust-lang/rust#164571 · Filter by author theemathas opened on Oct 19, 2026
  1

• [ICE]: insertion index (is 18446744073709551615) should be <= len (is 0)

  A-const-genericsC-bugI-ICEP-mediumregression-from-stable-to-nightlyT-compiler
  rust-lang/rust#164570 · Filter by author sososopy opened on Oct 19, 2026
  1

• Tidy complains about itself when remap-debuginfo = true

  A-tidyC-bugrequires-custom-configT-bootstrap
  rust-lang/rust#164567 · Filter by author xlambein opened on Oct 19, 2026
  2

• moving a Box out of a packed struct creates a misaligned &mut Box to drop it

  A-boxA-destructorsA-repr-packedC-bugI-unsoundP-mediumT-compilerT-opsem
  rust-lang/rust#164561 · Filter by author jsnell opened on Oct 19, 2026
  2