rust-lang/rust

Issues somebody may already be working on are listed last. List everything by date

• [ICE]: Incremental compilation failure when trying to handle pinned futures(?)

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  A-incr-comp A-pin C-bug I-ICE T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165657 · Opened Nov 8, 2026

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• [ICE]: `expected region 'static to be of kind ReVar`

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  C-bug F-reborrow I-ICE T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  rust-lang/rust#165656 · Opened Nov 8, 2026

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• [ICE]: ADT containing no '&mut T' or 'T: Reborrow' fields must only have one lifetime to implement Reborrow

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  C-bug F-reborrow I-ICE T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165653 · Opened Nov 8, 2026

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• `let_underscore_lock` suggestion crosses macro boundaries

  May be free again A pull request for this issue was closed without being merged. Open

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  A-diagnostics D-invalid-suggestion T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  rust-lang/rust#165650 · 1 reaction · Opened Nov 8, 2026

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• Tracking issue for MCP 1047: Add bootstrap tool to analyze compiler tests code coverage

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  B-MCP-approved C-tracking-issue S-tracking-unimplemented T-compiler

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  rust-lang/rust#165648 · 1 reaction · Opened Nov 8, 2026

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• Const blocks in fns with trivially unsatisifiable clauses can render addition of trait impls a post-monomorphization breaking change

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  A-const-eval A-crate-compat A-monomorphization C-bug T-compiler T-types

  Difficulty 5/5 Over a week Newbie friendliness 35/100

  rust-lang/rust#165647 · Opened Nov 8, 2026

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• unused_parens should probably not trigger for `&(v @ ...)` for clarity

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  A-diagnostics A-lints L-unused_parens T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165636 · 1 reaction · Opened Nov 8, 2026

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• Tracking issue for release notes of #164731: core: Stabilize `abort_immediate` as `crash`

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  A-run-make relnotes relnotes-needs-review relnotes-tracking-issue T-lang T-libs

  Difficulty 1/5 Under an hour Newbie friendliness 72/100

  rust-lang/rust#165607 · Opened Nov 7, 2026

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• Doc comments are discarded in `macro_rules` matcher

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  A-decl-macros-1-2 A-macros A-parser C-bug T-compiler T-lang

  Difficulty 4/5 3-5 days Newbie friendliness 56/100

  rust-lang/rust#165605 · Opened Nov 7, 2026

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• [ICE]: `Tracking borrow behind shared reference.`

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  C-bug F-reborrow I-ICE needs-triage T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165604 · Opened Nov 7, 2026

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• No loop unrolling or vectorization under opt-level=s + `#[optimize(size)]`

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  A-LLVM C-bug F-optimize_attribute I-slow needs-triage

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165601 · 2 comments · Opened Nov 7, 2026

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• `*-trusty` targets build failed

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  -Zbuild-std C-bug O-trusty T-libs

  Difficulty 4/5 3-5 days Newbie friendliness 43/100

  rust-lang/rust#165596 · 5 comments · Opened Nov 7, 2026

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• [ICE]: `no type for local variable`

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  C-bug F-move_expr I-ICE needs-triage T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  rust-lang/rust#165584 · Opened Nov 7, 2026

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• musl can't pass `dynamic-loading-cdylib`

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  A-linkage A-testsuite A-thread-locals C-bug O-musl T-libs

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165581 · 4 comments · Opened Nov 7, 2026

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• `aarch64-unknown-teeos` build failed

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  -Zbuild-std C-bug O-teeos T-libs

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165560 · 3 comments · Opened Nov 6, 2026

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• Use `rust-lld` by default on `x86_64-pc-windows-gnullvm`

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  A-linkage A-linkers C-tracking-issue O-windows-gnullvm T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  rust-lang/rust#165558 · 1 reaction · Opened Nov 6, 2026

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• Use `rust-lld` by default on `x86_64-pc-windows-gnu`

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  A-linkage A-linkers C-tracking-issue O-windows-gnu T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 43/100

  rust-lang/rust#165557 · Opened Nov 6, 2026

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• Use `rust-lld` by default on `aarch64-unknown-gnu-linux`

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  A-linkage A-linkers C-tracking-issue O-linux-gnu T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  rust-lang/rust#165555 · 1 comment · 1 reaction · Opened Nov 6, 2026

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• LLVM ERROR "Cannot select: i64 = sign_extend (v8i32 add ...)" with `-C lto=fat` and `-C target-cpu=x86-64-v4` (regression in 1.99)

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  A-LLVM A-LTO C-bug I-llvm-error I-prioritize O-x86_64 regression-from-stable-to-stable T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  rust-lang/rust#165551 · Opened Nov 6, 2026

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• Tracking issue for `str_split_at_unchecked`

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  C-tracking-issue S-tracking-unimplemented T-libs

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  rust-lang/rust#165545 · Opened Nov 6, 2026

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• Miscompile since 1.99: vectorized `&=` fold returns the wrong value (LLVM 23 find-last reduction, fixed upstream)

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  A-LLVM C-bug I-miscompile P-high regression-from-stable-to-stable

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  rust-lang/rust#165544 · 2 comments · Opened Nov 6, 2026

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• Tracking issue for release notes of #165037: Drop array elements in order after a partial move

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  relnotes relnotes-needs-review relnotes-tracking-issue T-compiler

  Difficulty 1/5 Under an hour Newbie friendliness 42/100

  rust-lang/rust#165541 · Opened Nov 6, 2026

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• [ICE]: cranelift's sanity checks fails on `transmute_unchecked` with different type sizes on dead path

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  A-cranelift C-bug I-ICE needs-triage requires-nightly T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 46/100

  rust-lang/rust#165532 · 1 comment · Opened Nov 6, 2026

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• Miscompilation at `opt-level=2` since the LLVM 23 upgrade (DFAJumpThreading)

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  A-LLVM I-miscompile I-prioritize regression-from-stable-to-stable T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  rust-lang/rust#165528 · 1 comment · Opened Nov 5, 2026

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• Tracking issue for release notes of #162504: Stabilize `unsafe_cell_access`

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  relnotes relnotes-needs-review relnotes-tracking-issue T-compiler T-libs

  Difficulty 1/5 Under an hour Newbie friendliness 78/100

  rust-lang/rust#165521 · Opened Nov 5, 2026

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• Tracking issue for release notes of #164716: Lower UEFI targets through LLVM's *uefi triple

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  A-LLVM O-Arm O-UEFI O-x86_64 relnotes relnotes-needs-review relnotes-tracking-issue T-compiler

  Difficulty 1/5 Under an hour Newbie friendliness 72/100

  rust-lang/rust#165504 · 1 comment · Opened Nov 5, 2026

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• Tracking issue for release notes of #164653: Deprecate internal function `vec::from_elem`

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  relnotes relnotes-tracking-issue T-libs

  Difficulty 1/5 Under an hour Newbie friendliness 72/100

  rust-lang/rust#165477 · Opened Nov 4, 2026

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• Pseudo-Tracking Issue for `compiler_builtins`

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  C-tracking-issue T-compiler

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  rust-lang/rust#165476 · 7 comments · 1 reaction · Opened Nov 4, 2026

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• Regression: Removing the sealing supertrait of `SliceIndex` was a breaking change (despite `impl(self)`)

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  A-coherence A-crate-compat A-slice-vec C-bug I-prioritize regression-from-stable-to-stable S-has-bisection T-lang T-libs T-types

  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  rust-lang/rust#165474 · 29 comments · Opened Nov 4, 2026

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• [ICE]: `-Zautodiff=Enable` aborts in Enzyme `TypeTree::insert` ("illegal insertion") on a by-value array of `(&str, f64)`, in a crate with no autodiff code

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  C-bug F-autodiff I-ICE needs-triage T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 54/100

  rust-lang/rust#165470 · 2 comments · Opened Nov 4, 2026

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• `-Zcrate-attr` consider injected `#![` and `]` relevant for spans

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  -Zcrate-attr C-bug T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 53/100

  rust-lang/rust#165450 · 1 comment · Opened Nov 4, 2026

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• [ICE]: entered unreachable code in `rustc_data_structures/src/vec_cache.rs:327:25`

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  A-incr-comp C-bug I-ICE needs-triage T-compiler

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  rust-lang/rust#165435 · 3 comments · Opened Nov 3, 2026

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• Tracking issue for release notes of #164258: clarify when `Vec::into_boxed_slice()` is in-place

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  relnotes relnotes-needs-review relnotes-tracking-issue T-libs

  Difficulty 2/5 Under an hour Newbie friendliness 35/100

  rust-lang/rust#165433 · Opened Nov 3, 2026

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• Tracking Issue for btf_type_tag and btf_decl_tag

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  A-debuginfo C-tracking-issue S-tracking-unimplemented T-compiler

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  rust-lang/rust#165422 · 1 comment · Opened Nov 3, 2026

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• Tracking issue for release notes of #153261: Partially stabilize `ptr_alignment_type` as `alignment_type`

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  relnotes relnotes-needs-review relnotes-tracking-issue T-libs

  Difficulty 1/5 Under an hour Newbie friendliness 25/100

  rust-lang/rust#165415 · Opened Nov 3, 2026

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• Strangly [E0275]: overflow evaluating the requirement

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  A-diagnostics T-compiler T-types WG-trait-system-refactor

  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  rust-lang/rust#165413 · 1 comment · Opened Nov 3, 2026

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• Calls in compiler_builtins can be silently replaced by `abort()`

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  A-compiler-builtins A-linkage A-linkers A-MIR A-uninhabited-types T-compiler T-opsem

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  rust-lang/rust#165399 · 24 comments · Opened Nov 3, 2026

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• Cross-compiling rustc with shared LLVM puts the build-machine llvm-config -L path on the target link (fatal on 32-bit arm)

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  A-cross A-linkage C-bug O-Arm requires-custom-config T-bootstrap

  Difficulty 4/5 3-5 days Newbie friendliness 18/100

  rust-lang/rust#165385 · 1 comment · Opened Nov 3, 2026

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• Tracking issue for release notes of #158368: std: make `Instant` a signed `Duration` on all platforms

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  O-SGX relnotes relnotes-needs-review relnotes-tracking-issue T-libs

  Difficulty 1/5 Under an hour Newbie friendliness 25/100

  rust-lang/rust#165367 · Opened Nov 2, 2026

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• Non-reproducible ThinLTO release builds from LLVM LoopSimplify PHI order (llvm#231143); fix 921c2c0b not yet in rustc's LLVM

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  A-LLVM A-reproducibility llvm-fixed-upstream

  Difficulty 4/5 3-5 days Newbie friendliness 20/100

  rust-lang/rust#165355 · Opened Nov 2, 2026

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• Tracking issue for release notes of #162929: Update unicode_data to Unicode version 18.0.0

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  A-Unicode relnotes relnotes-tracking-issue T-libs

  Difficulty 1/5 Under an hour Newbie friendliness 15/100

  rust-lang/rust#165348 · Opened Nov 2, 2026

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• aarch64-pc-windows-msvc: safe Rust exits with 0xC0000409 after a caught panic at opt-level=1

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  A-LLVM A-target-feature I-miscompile I-prioritize O-aarch64-pc-windows-msvc regression-from-stable-to-stable T-compiler

  Difficulty 5/5 Over a week Newbie friendliness 12/100

  rust-lang/rust#165346 · Opened Nov 2, 2026

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• mips64 fails tests/ui/abi/numbers-arithmetic/float-struct.rs

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  -Zbuild-std A-ABI A-floating-point C-bug I-miscompile O-MIPS T-compiler

  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  rust-lang/rust#165343 · Opened Nov 2, 2026

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• `TcpStream::connect_timeout` may time out much earlier than the requested duration

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  A-docs A-networking A-time C-bug T-libs

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  rust-lang/rust#165341 · 10 comments · Opened Nov 2, 2026

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• Inline asm: missing `vzeroupper` insertion for value-less `out("ymmN") _` / `out("zmmN") _` clobbers

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  A-inline-assembly A-LLVM C-bug T-compiler WG-llvm

  Difficulty 4/5 3-5 days Newbie friendliness 28/100

  rust-lang/rust#165332 · 1 comment · Opened Nov 2, 2026

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• GVN does not account for implicit retags during assignment

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  A-mir-opt A-mir-opt-GVN I-miscompile I-unsound P-medium T-compiler

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  rust-lang/rust#165327 · 1 comment · Opened Nov 2, 2026

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• Miscompilation with `-C opt-level=2 -C codegen-units=1`(but not with opt-level=3) due `loop-vectorize` llvm pass

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  A-LLVM C-bug I-miscompile S-found-by-fuzzing T-compiler WG-llvm

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  rust-lang/rust#165325 · 2 comments · Opened Nov 2, 2026

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• Nightly 2026-10-01 regresses with new E0275: overflow evaluating requirement

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  A-monomorphization C-bug E-needs-bisection I-cycle S-has-mcve T-types

  Difficulty 5/5 Over a week Newbie friendliness 8/100

  rust-lang/rust#165319 · 11 comments · Opened Nov 2, 2026

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• Float patterns: an arm with `-0.0` is skipped when the guard of an earlier `0.0` arm fails (wrong arm since 1.79)

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  A-floating-point A-patterns C-bug I-miscompile P-medium regression-from-stable-to-stable S-found-by-fuzzing

  Difficulty 4/5 3-5 days Newbie friendliness 15/100

  rust-lang/rust#165311 · 4 comments · Opened Nov 2, 2026

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• MIR optimizations and codegen evaluate the same constant under different where-clauses: type confusion in safe code at `-O`

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  A-const-eval A-intrinsics A-mir-opt C-bug I-miscompile I-prioritize I-unsound S-found-by-fuzzing S-has-bisection T-compiler T-types

  Difficulty 5/5 Over a week Newbie friendliness 6/100

  rust-lang/rust#165309 · 6 comments · Opened Nov 2, 2026

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