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Matthias Krüger 104c4bc808
Rollup merge of - dvdhrm:pr/transmzst, r=pnkfelix
compiler: allow transmute of ZST arrays with generics

Extend the `SizeSkeleton` evaluator to shortcut zero-sized arrays, thus considering `[T; 0]` to have a compile-time fixed-size of 0.

The existing evaluator already deals with generic arrays under the feature-guard `transmute_const_generics`. However, it merely allows comparing fixed-size types with fixed-size types, and generic types with generic types. For generic types, it merely compares whether their arguments match (ordering them first). Even if their exact sizes are not known at compile time, it can ensure that they will eventually be the same.

This patch extends this by shortcutting the size-evaluation of zero sized arrays and thus allowing size comparisons of `()` with `[T; 0]`, where one contains generics and the other does not.

This code is guarded by `transmute_const_generics` (), even though it is unclear whether it should be. However, this assumes that a separate stabilization PR is required to move this out of the feature guard.

Initially reported in .
2024-03-22 20:31:28 +01:00
.github Update the minimum external LLVM to 17 2024-03-17 10:11:04 -07:00
.reuse std: move Once implementations to sys 2024-03-12 15:41:06 +01:00
compiler Rollup merge of - dvdhrm:pr/transmzst, r=pnkfelix 2024-03-22 20:31:28 +01:00
library Rollup merge of - zachs18:nonnull-slice-is_empty, r=Amanieu 2024-03-22 11:37:00 +01:00
LICENSES Add missing CC-BY-SA-4.0. 2023-11-27 11:03:53 +00:00
src Auto merge of - saethlin:compiler-builtins-can-panic, r=pnkfelix 2024-03-22 16:55:11 +00:00
tests Rollup merge of - dvdhrm:pr/transmzst, r=pnkfelix 2024-03-22 20:31:28 +01:00
.editorconfig Only use max_line_length = 100 for *.rs 2023-07-10 15:18:36 -07:00
.git-blame-ignore-revs Ignore compiletest test directive migration commits 2024-02-22 18:55:02 +00:00
.gitattributes Rename config.toml.example to config.example.toml 2023-03-11 14:10:00 -08:00
.gitignore don't globally ignore rustc-ice files 2023-09-16 09:44:44 +02:00
.gitmodules Update to LLVM 18 2024-02-13 10:33:40 +01:00
.mailmap correct my mailmap entry 2024-01-21 20:47:26 -05:00
Cargo.lock Auto merge of - saethlin:compiler-builtins-can-panic, r=pnkfelix 2024-03-22 16:55:11 +00:00
Cargo.toml Bump Clippy version -> 0.1.79 2024-03-21 22:06:41 +01:00
CODE_OF_CONDUCT.md Remove the code of conduct; instead link https://www.rust-lang.org/conduct.html 2019-10-05 22:55:19 +02:00
config.example.toml use more accurate terminology 2024-03-19 20:32:55 +02:00
configure Ensure ./configure works when configure.py path contains spaces 2024-02-16 18:57:22 +00:00
CONTRIBUTING.md fix: Update CONTRIBUTING.md recommend -> recommended 2023-11-16 23:57:09 +05:30
COPYRIGHT Update COPYRIGHT file 2022-10-30 10:23:14 -04:00
INSTALL.md Fix numbering in INSTALL.md#MinGW 2024-03-11 02:25:21 +00:00
LICENSE-APACHE Remove appendix from LICENCE-APACHE 2019-12-30 14:25:53 +00:00
LICENSE-MIT LICENSE-MIT: Remove inaccurate (misattributed) copyright notice 2017-07-26 16:51:58 -07:00
README.md Update Readme 2024-01-15 13:57:29 -08:00
RELEASES.md Fix a typo in the 1.77.0 relnotes 2024-03-18 10:30:22 -07:00
rust-bors.toml Increase timeout for new bors bot 2024-03-13 08:31:07 +01:00
rustfmt.toml Remove exception for deleted file from rustfmt.toml 2024-03-08 20:46:33 +00:00
triagebot.toml Notify fmease on changes to HIR ty lowering 2024-03-22 06:32:51 +01:00
x Make x capable of resolving symlinks 2023-10-14 17:53:33 +03:00
x.ps1 use & instead of start-process in x.ps1 2023-12-09 09:46:16 -05:00
x.py Fix recent python linting errors 2023-08-02 04:40:28 -04:00

The Rust Programming Language

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