Remove polymorphization - #133883

saethlin · 2024-12-05T02:03:52Z

This PR removes the flag -Zpolymorphize and all the infrastructure in the compiler that exists only to support it, per rust-lang/compiler-team#810.

saethlin · 2024-12-05T03:51:55Z

r? compiler-errors

rustbot · 2024-12-05T03:52:29Z

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

Some changes occurred to the CTFE machinery

cc @rust-lang/wg-const-eval

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

compiler-errors · 2024-12-05T03:54:27Z

r=me after it's green

@bors rollup=never

(since it likely has a net-positive perf result, but let's not block this PR on perf.)

compiler-errors · 2024-12-05T04:08:26Z

looks like you've got an unnecessary import for TypeVisitableExt

rustbot · 2024-12-05T16:16:24Z

rust-analyzer is developed in its own repository. If possible, consider making this change to rust-lang/rust-analyzer instead.

cc @rust-lang/rust-analyzer

saethlin · 2024-12-05T16:17:34Z

@compiler-errors I'm not 100% sure I rebased properly over the change in compiler/rustc_ty_utils/src/abi.rs.

I also expanded my search a bit and found a few more mentions of polymorphization to delete. Can you take a look?

compiler-errors · 2024-12-05T16:36:01Z

lgtm, r=me

saethlin · 2024-12-05T17:25:52Z

@bors r=compiler-errors

bors · 2024-12-05T17:25:55Z

📌 Commit eb4a656 has been approved by compiler-errors

It is now in the queue for this repository.

bors · 2024-12-06T21:21:24Z

☔ The latest upstream changes (presumably #133089) made this pull request unmergeable. Please resolve the merge conflicts.

lqd · 2024-12-07T07:21:41Z

Massively positive results, regressions are small and in stress tests only, marking as triaged.

@rustbot label: +perf-regression-triaged

nnethercote · 2024-12-07T08:59:46Z

Is it possible to briefly summarize the source of the performance improvements? I'm just curious.

saethlin · 2024-12-07T13:21:40Z

This PR deletes an often-called query and its associated table. I believe most of the improvement is caused by having less nodes in the query dep graph. Even though all those queries are effectively no-ops. (I would call this query overhead)

nnethercote · 2024-12-07T22:07:28Z

Was it an oversight that the query was being called despite not doing anything useful? Or was it more complicated than that?

bjorn3 · 2024-12-07T22:12:22Z

The result of the unused_generic_params query was previously encoded in the crate metadata in case a crate that depends on the local crate uses -Zpolymorphize.

compiler-errors · 2024-12-07T22:12:43Z

I feel like the code perhaps couldve been written to not touch the polymorphization codepaths unless the feature was enabled, though not totally certain given polymorphization's interaction with codegen 🤔

not certain if the unused parameters query couldve been pushed onto the crates that actually needed it (ie the ones build with Zpolymorphize)

Pkgsrc changes relative to rust184: * patch reorganization to deal with new version of upstream vendored crates, checksum updates. Version 1.85.0 (2025-02-20) ========================== Language -------- - [The 2024 Edition is now stable.] (rust-lang/rust#133349) See [the edition guide] (https://doc.rust-lang.org/nightly/edition-guide/rust-2024/index.html) for more details. - [Stabilize async closures] (rust-lang/rust#132706) See [RFC 3668] (https://rust-lang.github.io/rfcs/3668-async-closures.html) for more details. - [Stabilize `#[diagnostic::do_not_recommend]`] (rust-lang/rust#132056) - [Add `unpredictable_function_pointer_comparisons` lint to warn against function pointer comparisons] (rust-lang/rust#118833) - [Lint on combining `#[no_mangle]` and `#[export_name]` attributes.] (rust-lang/rust#131558) Compiler -------- - [The unstable flag `-Zpolymorphize` has been removed] (rust-lang/rust#133883), see rust-lang/compiler-team#810 for some background. Platform Support ---------------- - [Promote `powerpc64le-unknown-linux-musl` to tier 2 with host tools] (rust-lang/rust#133801) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Panics in the standard library now have a leading `library/` in their path] (rust-lang/rust#132390) - [`std::env::home_dir()` on Windows now ignores the non-standard `$HOME` environment variable] (rust-lang/rust#132515) It will be un-deprecated in a subsequent release. - [Add `AsyncFn*` to the prelude in all editions.] (rust-lang/rust#132611) Stabilized APIs --------------- - [`BuildHasherDefault::new`] (https://doc.rust-lang.org/stable/std/hash/struct.BuildHasherDefault.html#method.new) - [`ptr::fn_addr_eq`] (https://doc.rust-lang.org/std/ptr/fn.fn_addr_eq.html) - [`io::ErrorKind::QuotaExceeded`] (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.QuotaExceeded) - [`io::ErrorKind::CrossesDevices`] (https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.CrossesDevices) - [`{float}::midpoint`] (https://doc.rust-lang.org/core/primitive.f32.html#method.midpoint) - [Unsigned `{integer}::midpoint`] (https://doc.rust-lang.org/std/primitive.u64.html#method.midpoint) - [`NonZeroU*::midpoint`] (https://doc.rust-lang.org/std/num/type.NonZeroU32.html#method.midpoint) - [impl `std::iter::Extend` for tuples with arity 1 through 12] (https://doc.rust-lang.org/stable/std/iter/trait.Extend.html#impl-Extend%3C(A,)%3E-for-(EA,)) - [`FromIterator<(A, ...)>` for tuples with arity 1 through 12] (https://doc.rust-lang.org/stable/std/iter/trait.FromIterator.html#impl-FromIterator%3C(EA,)%3E-for-(A,)) - [`std::task::Waker::noop`] (https://doc.rust-lang.org/stable/std/task/struct.Waker.html#method.noop) These APIs are now stable in const contexts: - [`mem::size_of_val`] (https://doc.rust-lang.org/stable/std/mem/fn.size_of_val.html) - [`mem::align_of_val`] (https://doc.rust-lang.org/stable/std/mem/fn.align_of_val.html) - [`Layout::for_value`] (https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.for_value) - [`Layout::align_to`] (https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align_to) - [`Layout::pad_to_align`] (https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.pad_to_align) - [`Layout::extend`] (https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.extend) - [`Layout::array`] (https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.array) - [`std::mem::swap`] (https://doc.rust-lang.org/stable/std/mem/fn.swap.html) - [`std::ptr::swap`] (https://doc.rust-lang.org/stable/std/ptr/fn.swap.html) - [`NonNull::new`] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.new) - [`HashMap::with_hasher`] (https://doc.rust-lang.org/stable/std/collections/struct.HashMap.html#method.with_hasher) - [`HashSet::with_hasher`] (https://doc.rust-lang.org/stable/std/collections/struct.HashSet.html#method.with_hasher) - [`BuildHasherDefault::new`] (https://doc.rust-lang.org/stable/std/hash/struct.BuildHasherDefault.html#method.new) - [`<float>::recip`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.recip) - [`<float>::to_degrees`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.to_degrees) - [`<float>::to_radians`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.to_radians) - [`<float>::max`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.max) - [`<float>::min`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.min) - [`<float>::clamp`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp) - [`<float>::abs`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.abs) - [`<float>::signum`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.signum) - [`<float>::copysign`] (https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign) - [`MaybeUninit::write`] (https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write) Cargo ----- - [Add future-incompatibility warning against keywords in cfgs and add raw-idents] (rust-lang/cargo#14671) - [Stabilize higher precedence trailing flags] (rust-lang/cargo#14900) - [Pass `CARGO_CFG_FEATURE` to build scripts] (rust-lang/cargo#14902) Rustdoc ----- - [Doc comment on impl blocks shows the first line, even when the impl block is collapsed] (rust-lang/rust#132155) Compatibility Notes ------------------- - [`rustc` no longer treats the `test` cfg as a well known check-cfg] (rust-lang/rust#131729), instead it is up to the build systems and users of `--check-cfg`[^check-cfg] to set it as a well known cfg using `--check-cfg=cfg(test)`. This is done to enable build systems like Cargo to set it conditionally, as not all source files are suitable for unit tests. [Cargo (for now) unconditionally sets the `test` cfg as a well known cfg] (rust-lang/cargo#14963). [^check-cfg]: https://doc.rust-lang.org/nightly/rustc/check-cfg.html - [Disable potentially incorrect type inference if there are trivial and non-trivial where-clauses] (rust-lang/rust#132325) - `std::env::home_dir()` has been deprecated for years, because it can give surprising results in some Windows configurations if the `HOME` environment variable is set (which is not the normal configuration on Windows). We had previously avoided changing its behavior, out of concern for compatibility with code depending on this non-standard configuration. Given how long this function has been deprecated, we're now fixing its behavior as a bugfix. A subsequent release will remove the deprecation for this function. - [Make `core::ffi::c_char` signedness more closely match that of the platform-default `char`] (rust-lang/rust#132975) This changed `c_char` from an `i8` to `u8` or vice versa on many Tier 2 and 3 targets (mostly Arm and RISC-V embedded targets). The new definition may result in compilation failures but fixes compatibility issues with C. The `libc` crate matches this change as of its 0.2.169 release. - [When compiling a nested `macro_rules` macro from an external crate, the content of the inner `macro_rules` is now built with the edition of the external crate, not the local crate.] (rust-lang/rust#133274) - [Increase `sparcv9-sun-solaris` and `x86_64-pc-solaris` Solaris baseline to 11.4.] (rust-lang/rust#133293) - [Show `abi_unsupported_vector_types` lint in future breakage reports] (rust-lang/rust#133374) - [Error if multiple super-trait instantiations of `dyn Trait` need associated types to be specified but only one is provided] (rust-lang/rust#133392) - [Change `powerpc64-ibm-aix` default `codemodel` to large] (rust-lang/rust#133811) 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. - [Build `x86_64-unknown-linux-gnu` with LTO for C/C++ code (e.g., `jemalloc`)] (rust-lang/rust#134690)

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.84.1` -> `1.85.0` | 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> ### [`v1.85.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1850-2025-02-20) [Compare Source](rust-lang/rust@1.84.1...1.85.0) \========================== <a id="1.85.0-Language"></a> ## Language - [The 2024 Edition is now stable.](rust-lang/rust#133349) See [the edition guide](https://doc.rust-lang.org/nightly/edition-guide/rust-2024/index.html) for more details. - [Stabilize async closures](rust-lang/rust#132706) See [RFC 3668](https://rust-lang.github.io/rfcs/3668-async-closures.html) for more details. - [Stabilize `#[diagnostic::do_not_recommend]`](rust-lang/rust#132056) - [Add `unpredictable_function_pointer_comparisons` lint to warn against function pointer comparisons](rust-lang/rust#118833) - [Lint on combining `#[no_mangle]` and `#[export_name]` attributes.](rust-lang/rust#131558) <a id="1.85.0-Compiler"></a> ## Compiler - [The unstable flag `-Zpolymorphize` has been removed](rust-lang/rust#133883), see rust-lang/compiler-team#810 for some background. <a id="1.85.0-Platform-Support"></a> ## Platform Support - [Promote `powerpc64le-unknown-linux-musl` to tier 2 with host tools](rust-lang/rust#133801) Refer to Rust's \[platform support page]\[platform-support-doc] for more information on Rust's tiered platform support. <a id="1.85.0-Libraries"></a> ## Libraries - [Panics in the standard library now have a leading `library/` in their path](rust-lang/rust#132390) - [`std::env::home_dir()` on Windows now ignores the non-standard `$HOME` environment variable](rust-lang/rust#132515) It will be un-deprecated in a subsequent release. - [Add `AsyncFn*` to the prelude in all editions.](rust-lang/rust#132611) <a id="1.85.0-Stabilized-APIs"></a> ## Stabilized APIs - [`BuildHasherDefault::new`](https://doc.rust-lang.org/stable/std/hash/struct.BuildHasherDefault.html#method.new) - [`ptr::fn_addr_eq`](https://doc.rust-lang.org/std/ptr/fn.fn_addr_eq.html) - [`io::ErrorKind::QuotaExceeded`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.QuotaExceeded) - [`io::ErrorKind::CrossesDevices`](https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#variant.CrossesDevices) - [`{float}::midpoint`](https://doc.rust-lang.org/core/primitive.f32.html#method.midpoint) - [Unsigned `{integer}::midpoint`](https://doc.rust-lang.org/std/primitive.u64.html#method.midpoint) - [`NonZeroU*::midpoint`](https://doc.rust-lang.org/std/num/type.NonZeroU32.html#method.midpoint) - [impl `std::iter::Extend` for tuples with arity 1 through 12](https://doc.rust-lang.org/stable/std/iter/trait.Extend.html#impl-Extend%3C$A,$%3E-for-$EA,$) - [`FromIterator<(A, ...)>` for tuples with arity 1 through 12](https://doc.rust-lang.org/stable/std/iter/trait.FromIterator.html#impl-FromIterator%3C$EA,$%3E-for-$A,$) - [`std::task::Waker::noop`](https://doc.rust-lang.org/stable/std/task/struct.Waker.html#method.noop) These APIs are now stable in const contexts: - [`mem::size_of_val`](https://doc.rust-lang.org/stable/std/mem/fn.size_of_val.html) - [`mem::align_of_val`](https://doc.rust-lang.org/stable/std/mem/fn.align_of_val.html) - [`Layout::for_value`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.for_value) - [`Layout::align_to`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align_to) - [`Layout::pad_to_align`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.pad_to_align) - [`Layout::extend`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.extend) - [`Layout::array`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.array) - [`std::mem::swap`](https://doc.rust-lang.org/stable/std/mem/fn.swap.html) - [`std::ptr::swap`](https://doc.rust-lang.org/stable/std/ptr/fn.swap.html) - [`NonNull::new`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.new) - [`HashMap::with_hasher`](https://doc.rust-lang.org/stable/std/collections/struct.HashMap.html#method.with_hasher) - [`HashSet::with_hasher`](https://doc.rust-lang.org/stable/std/collections/struct.HashSet.html#method.with_hasher) - [`BuildHasherDefault::new`](https://doc.rust-lang.org/stable/std/hash/struct.BuildHasherDefault.html#method.new) - [`<float>::recip`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.recip) - [`<float>::to_degrees`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.to_degrees) - [`<float>::to_radians`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.to_radians) - [`<float>::max`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.max) - [`<float>::min`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.min) - [`<float>::clamp`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp) - [`<float>::abs`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.abs) - [`<float>::signum`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.signum) - [`<float>::copysign`](https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign) - [`MaybeUninit::write`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write) <a id="1.85.0-Cargo"></a> ## Cargo - [Add future-incompatibility warning against keywords in cfgs and add raw-idents](rust-lang/cargo#14671) - [Stabilize higher precedence trailing flags](rust-lang/cargo#14900) - [Pass `CARGO_CFG_FEATURE` to build scripts](rust-lang/cargo#14902) <a id="1.85.0-Rustdoc"></a> ## Rustdoc - [Doc comment on impl blocks shows the first line, even when the impl block is collapsed](rust-lang/rust#132155) <a id="1.85.0-Compatibility-Notes"></a> ## Compatibility Notes - [`rustc` no longer treats the `test` cfg as a well known check-cfg](rust-lang/rust#131729), instead it is up to the build systems and users of `--check-cfg`\[^check-cfg] to set it as a well known cfg using `--check-cfg=cfg(test)`. This is done to enable build systems like Cargo to set it conditionally, as not all source files are suitable for unit tests. [Cargo (for now) unconditionally sets the `test` cfg as a well known cfg](rust-lang/cargo#14963). \[^check-cfg]: https://doc.rust-lang.org/nightly/rustc/check-cfg.html - [Disable potentially incorrect type inference if there are trivial and non-trivial where-clauses](rust-lang/rust#132325) - `std::env::home_dir()` has been deprecated for years, because it can give surprising results in some Windows configurations if the `HOME` environment variable is set (which is not the normal configuration on Windows). We had previously avoided changing its behavior, out of concern for compatibility with code depending on this non-standard configuration. Given how long this function has been deprecated, we're now fixing its behavior as a bugfix. A subsequent release will remove the deprecation for this function. - [Make `core::ffi::c_char` signedness more closely match that of the platform-default `char`](rust-lang/rust#132975) This changed `c_char` from an `i8` to `u8` or vice versa on many Tier 2 and 3 targets (mostly Arm and RISC-V embedded targets). The new definition may result in compilation failures but fixes compatibility issues with C. The `libc` crate matches this change as of its 0.2.169 release. - [When compiling a nested `macro_rules` macro from an external crate, the content of the inner `macro_rules` is now built with the edition of the external crate, not the local crate.](rust-lang/rust#133274) - [Increase `sparcv9-sun-solaris` and `x86_64-pc-solaris` Solaris baseline to 11.4.](rust-lang/rust#133293) - [Show `abi_unsupported_vector_types` lint in future breakage reports](rust-lang/rust#133374) - [Error if multiple super-trait instantiations of `dyn Trait` need associated types to be specified but only one is provided](rust-lang/rust#133392) - [Change `powerpc64-ibm-aix` default `codemodel` to large](rust-lang/rust#133811) <a id="1.85.0-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. - [Build `x86_64-unknown-linux-gnu` with LTO for C/C++ code (e.g., `jemalloc`)](rust-lang/rust#134690) </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).

These types have been unused since polymorphization was removed in <rust-lang#133883>.

Remove unused types `UnusedGenericParams` and `FiniteBitSet` - These types have been unused since polymorphization was removed in <rust-lang#133883>.

Remove unused types `UnusedGenericParams` and `FiniteBitSet` - These types have been unused since polymorphization was removed in <rust-lang/rust#133883>.

These types have been unused since polymorphization was removed in <rust-lang#133883>.

compiler-errors reviewed Dec 5, 2024

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Comment thread tests/ui/coroutine/polymorphize-args.rs

Comment thread tests/ui/mir/inline-wrong-abi.rs

Comment thread tests/ui/unsized/issue-115809.rs

Comment thread compiler/rustc_ty_utils/src/abi.rs

Comment thread compiler/rustc_monomorphize/src/partitioning.rs

rustbot assigned compiler-errors Dec 5, 2024

saethlin force-pushed the remove-polymorphization branch from f70a014 to 2c6e802 Compare December 5, 2024 03:52

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saethlin force-pushed the remove-polymorphization branch from 2c6e802 to 7337610 Compare December 5, 2024 04:13

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Comment thread compiler/rustc_codegen_cranelift/build_system/tests.rs

saethlin force-pushed the remove-polymorphization branch 2 times, most recently from a879158 to eb4a656 Compare December 5, 2024 16:16

bors 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 Dec 5, 2024

jieyouxu added the relnotes Marks issues that should be documented in the release notes of the next release. label Dec 5, 2024

rustbot mentioned this pull request Dec 5, 2024

Tracking issue for release notes of #133883: Remove polymorphization #133928

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jieyouxu mentioned this pull request Dec 6, 2024

LLD crash with polymorphization #82568

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bors removed the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Dec 6, 2024

rustbot added the perf-regression Performance regression. label Dec 7, 2024

rustbot added the perf-regression-triaged The performance regression has been triaged. label Dec 7, 2024

saethlin deleted the remove-polymorphization branch December 7, 2024 13:15

oriongonza mentioned this pull request Dec 10, 2024

remove polymorphization rust-lang/rustc-dev-guide#2158

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compiler-errors mentioned this pull request Jan 3, 2025

Tracking Issue for polymorphization #124962

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Zalathar added a commit to Zalathar/rust that referenced this pull request Mar 18, 2026

Remove unused types UnusedGenericParams and FiniteBitSet

fb850ae

These types have been unused since polymorphization was removed in <rust-lang#133883>.

Zalathar mentioned this pull request Mar 18, 2026

Remove unused types UnusedGenericParams and FiniteBitSet #154026

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zedddie pushed a commit to zedddie/rust that referenced this pull request Mar 25, 2026

Remove unused types UnusedGenericParams and FiniteBitSet

0866319

These types have been unused since polymorphization was removed in <rust-lang#133883>.

MaskRay mentioned this pull request May 24, 2026

Closures in generic code can create duplicate monomorphizations #83010

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groundlar mentioned this pull request Aug 6, 2026

Monomorphization: key specializations on instantiation identity, not a resolved type cambra-dev/cambra#50

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